阅读说明：本技术 一种利用激光测量校准微风速仪的装置及使用方法 (Device for calibrating micro anemometer by using laser measurement and use method ) 是由 孙玮 程远 于 2021-11-03 设计创作，主要内容包括：本发明涉及激光测量技术领域,特别涉及一种利用激光测量校准微风速仪的装置及使用方法,用于弥补目前没有专门针对微风速仪进行校准的设备的缺陷。本发明通过激光多普勒测速仪照射透明的风道,测出风道中的随风运动的示踪粒子烟雾,就是风道中的风速,以此作为风速标定值,然后再与经过堵塞比计算修正后的风速仪测头得到的风速进行对比,以此来显示风速仪的精准度。本发明的有益效果为：利用激光测量技术,解决了现有的微风速仪校准质量和校准效率不高的问题,大大提高了微风速仪的准确度。(The invention relates to the technical field of laser measurement, in particular to a device for calibrating a micro anemometer by utilizing laser measurement and a using method thereof, which are used for overcoming the defect that no equipment specially used for calibrating the micro anemometer exists at present. The method comprises the steps of irradiating a transparent air channel through a laser Doppler velocimeter, measuring tracer particle smoke moving along with the wind in the air channel, namely the wind speed in the air channel, taking the wind speed as a wind speed calibration value, and then comparing the wind speed with the wind speed obtained by an anemometer measuring head after calculation and correction of a blockage ratio, so as to display the accuracy of the anemometer. The invention has the beneficial effects that: by utilizing the laser measurement technology, the problems of low calibration quality and low calibration efficiency of the existing anemoscope are solved, and the accuracy of the anemoscope is greatly improved.)

1. The utility model provides an utilize device of laser survey calibration gentle anemoscope, includes fixed and adjusting device of reducing straight-path type wind-tunnel, gentle anemoscope sample, laser Doppler velocimeter (43), trace particle smoke generator (2), demonstration PLC controller (37) and gentle anemoscope sample profile measuring device, its characterized in that:

the variable-diameter straight-path wind tunnel is lifted on a workbench (1) of a laboratory through a plurality of brackets, and the central line of the variable-diameter straight-path wind tunnel is horizontal;

the device for fixing and adjusting the sample of the micro anemometer is fixedly arranged at the working section (12) of the variable diameter straight-path wind tunnel, and the device for fixing and adjusting the sample of the micro anemometer clamps and adjusts the position of the sample (24) of the micro anemometer in the working section (12) of the variable diameter straight-path wind tunnel;

the laser Doppler velocimeter (43) is arranged on one side of the working section (12) through a bracket placed on the ground, and the laser Doppler velocimeter (43) faces the sample (24) of the micro anemometer;

the tracer particle smoke generator (2) is arranged on the right end ground of an air inlet section (5) of the variable-diameter straight-path wind tunnel;

the display PLC controller (37) is provided with a calibration control program and image analysis software and is connected with all the electric elements in a control mode.

2. The device for calibrating a anemometer using laser measurements according to claim 1, characterized in that:

the variable-diameter straight-path wind tunnel sequentially comprises an air inlet section (5), a damping section (8), an air inlet stabilizing section (10), a round-to-square contraction section (11), a working section (12), a square-to-round contraction section (29), an air outlet stabilizing section (30), a long horn mouth section (31) and a wind wing rotating section (32) from right to left, wherein the air inlet stabilizing section (10), the round-to-square contraction section (11), the working section (12), the square-to-round contraction section (29), the air outlet stabilizing section (30), the long horn mouth section (31) and the wind wing rotating section (32) are of an integrated structure made of a polycarbonate transparent material;

a protective screen (4) is arranged at the inlet of the air inlet section (5), a honeycomb device (6) is arranged in the air inlet section (5), the air inlet section (5) is connected with a damping section (8) through a flange A (7), a damping net (9) is arranged in the damping section (8), and the damping section (8) is connected with the right end of the air inlet stabilizing section (10) through a flange;

a hole C (39) is formed in the upper portion of the middle of the working section (12), and a sample fixing and adjusting device of a micro anemometer is installed at the position of the hole C (39);

three pairs of wind fins (33) are arranged in the wind fin rotating section (32) and fixed on a long motor shaft B (34), and a servo motor B (35) is fixed on a bracket A (36) through bolts.

3. The device for calibrating a anemometer using laser measurements according to claim 2, characterized in that:

the device for fixing and adjusting the sample of the micro anemoscope comprises an anemoscope side head (48), wherein the anemoscope side head (48) is vertically inserted below a hole C (39), a connecting rod (49) of an anemoscope measuring head (48) is inserted with a lower sealing ring (27) and an upper sealing ring (14), the center of the lower sealing ring (27) is provided with a hole B (51), the right side of the major diameter of the lower sealing ring is provided with a right gap (46), the center of the upper sealing ring (14) is provided with a hole A (50), the left side of the major diameter of the upper sealing ring is provided with a left gap (45), the lower sealing ring (27) is arranged in the hole C (39) and a fixing ring (28), the upper sealing ring (14) is pressed on the lower sealing ring (27), the upper sealing ring (14) can seal the right gap (46) on the lower sealing ring (27), and the upper sealing ring (14) and the lower sealing ring (27) are both made of high-elasticity wear-resistant rubber;

the fixing ring (28) is fixedly welded at the top outside the hole C (39), the lower surfaces of the left pressure plate (26) and the right pressure plate (13) are pressed on the upper surface of the upper sealing ring (14), the left pressure plate (26) and the right pressure plate (13) are fastened on the fixing ring (28) through bolts, a left pressure plate center half hole (52) is formed in the center of the left pressure plate (26), a right pressure plate center half hole (53) is formed in the center of the right pressure plate, and a connecting rod (49) is arranged in the centers of the two half holes and the aligned hole;

fixed ring (28)'s both sides top is fixed with portal frame (22), portal frame's (22) both sides door frame bottom is on a parallel with wind-tunnel horizontal axis central line (47), servo motor A (20) are equipped with through the bolt at portal frame (22) back timber middle part lower surface, fixed axle sleeve A (23) are gone up in motor shaft A (21), horizontal connecting plate (19) have been welded on axle sleeve A (23), pass through bolt fastening perpendicular electric telescopic handle A (18) at the other end of horizontal connecting plate (19), pass through ring flange B (16) fixed electric clamping jaw A (15) at the lower extreme of flexible end A (17), the upper portion of two horizontal clamping jaw A (25) centre gripping connecting rod (49), electric telescopic handle A (18) work can make anemoscope gauge head (48) reciprocate, servo motor A (20) work can make anemoscope gauge head (48) rotate.

4. The device for calibrating a anemometer using laser measurements according to claim 1, characterized in that:

a bracket B (38) is placed on the ground behind the working section (12), a servo motor C (43) is arranged on the bracket B (38), a laser Doppler velocimeter (42) is arranged on the shaft of the servo motor C (43), and a monitoring camera (44) is arranged on the upper part of the front of the bracket B (38).

5. The device for calibrating a anemometer using laser measurements according to claim 1, characterized in that:

the device for measuring the profile of the sample of the micro anemoscope comprises an electric clamping jaw B (59) arranged on a workbench (1), wherein the clamping jaw B (58) upwards clamps the sample of the micro anemoscope (24), the anemoscope side head (48) of the sample of the micro anemoscope (24) is upwards placed, and a high-speed profile measuring instrument (56) connected with an electric telescopic rod B (54) is vertically arranged side by side on one side of the sample of the micro anemoscope (24).

6. Use of a device for calibrating a anemometer using laser measurements according to any of claims 1-5, characterized in that it comprises the following steps:

s1, firstly, measuring and calculating the blocking ratio of the part of the micro anemometer sample (24) entering the wind tunnel, namely the profiles of the anemometer measuring head (48) and the connecting rod (49);

s2, after calculation is finished, pressing a profile measurement finishing button in the PLC (37), enabling the electric clamping jaw B (59) to work reversely, taking down the anemoscope sample (24), vertically inserting the anemoscope measuring head (48) of the anemoscope sample (24) into the fixing ring (28), and enabling the horizontal axis center line of the anemoscope measuring head (48) to coincide with the wind tunnel horizontal axis center line (47) as far as possible;

s3, secondly, inserting a connecting rod (49) into a right gap (46) on a lower sealing ring (27) from left to right, inserting a connecting rod (49) into a left gap (45) of an upper sealing ring (14) from right to left above the lower sealing ring (27), aligning a left pressure plate (26) and a right pressure plate (13) into a circle, placing the circle above the upper sealing ring (14), fastening the left pressure plate (26) and the right pressure plate (13) on a fixing ring (28) by bolts, enabling the lower sealing ring (27) to be located in a hole C (39) and the fixing ring (28), and sealing the right gap (46) on the lower sealing ring (27) by the lower surface of the upper sealing ring (14);

s4, pressing a start button in the display PLC (37), enabling each electric control component to enter a working state, displaying that the PLC (37) controls the electric clamping jaw A (15) to work to enable the two clamping jaws A (25) to clamp the connecting rod (49), starting the electric telescopic rod A (18) by the PLC according to image data provided by the monitoring camera (44) to enable the horizontal axis center line of the anemoscope measuring head (48) to move to a position overlapped with the horizontal axis center line (47) of the wind tunnel, starting the servo motor A (20) to enable the windward side of the anemoscope measuring head (48) to be perpendicular to the horizontal axis center line (47) of the wind tunnel, and calculating an actual blockage ratio by the PLC according to the actual insertion depth of the anemoscope measuring head (48) and the connecting rod (49) into the wind tunnel working section (12) and the known area profile of the working section (12);

s5, then, the PLC (37) is displayed to start the long motor shaft B (34) of the servo motor B (35) to rotate according to programming, three pairs of wind wings (33) installed on the long motor shaft B (34) rotate to enable the wind tunnel to form pressure difference from right to left, airflow overflow at the wind wing rotating section (33) is controlled and guaranteed due to the adoption of the long motor shaft B (34), when the rotating speed and the working time of the servo motor B (35) reach programming set values, the PLC (37) starts the trace particle smoke emitter (2) to enable a small amount of smoke to overflow from the smoke outlet (3), the smoke is the special particle diameter of the wind tunnel flow field of 0.2-10 micrometers, and the smoke flows from the air inlet section (5) to the working section (12) due to negative pressure at the right side of the wind tunnel and finally overflows through the wind wing rotating section (32);

and S6, finally, after the wind speed in the wind tunnel working section (12) is stable, the laser Doppler velocimeter (42) detects that the wind speed of the trace particle smoke flowing through the anemoscope measuring head (48) is a wind tunnel calibration value, the calibration value is compared with the wind speed value detected by the anemoscope measuring head (48) of the micro anemoscope sample (24), the PLC (37) is displayed to make a calibration result of the micro anemoscope sample (24), and finally the PLC (37) controls the trace particle smoke emitter (2) and related electric control components to stop working.

7. Use of a device for calibrating a anemometer using laser measurements according to claim 6, characterized in that:

the method for calculating the clogging ratio in S1 includes: the method comprises the steps that a handle of a micro anemoscope sample (24) is placed between two parallel clamping jaws B (58), a profile measuring button in a PLC (37) is pressed to display, the electric clamping jaws B (59) work, the two clamping jaws B (58) clamp the micro anemoscope sample (24), a laser emitting surface (57) is emitted by the high-speed profile measuring instrument (56) in a working mode and irradiates on an anemoscope measuring head (48) and a connecting rod (49), the electric telescopic rod B (54) works to enable the laser emitting surface (57) emitted by the high-speed profile measuring instrument (56) installed at the upper end of the telescopic rod B (55) to sweep over the anemoscope measuring head (48) and the connecting rod (49), the high-speed profile measuring instrument (56) sends measured data to the PLC (37), and the blocking ratio is to be calculated.

Technical Field

The invention relates to the technical field of laser measurement, in particular to a device for calibrating a micro anemometer by utilizing laser measurement and a using method thereof.

Background

In a plurality of fields such as environmental detection, meteorology, agriculture, biomedicine, industrial equipment, military industry and the like, the flow velocity of gas is generally called breeze below 2m/s, and the calibration of the breeze speedometer is not completely solved for a long time, so the accuracy of the breeze speedometer is questioned.

Laser measurement mainly uses the Doppler Effect (Doppler Effect) principle: when the target approaches the radar antenna, the reflected signal frequency will be higher than the transmitter frequency; conversely, when the target moves away from the antenna, the reflected signal frequency will be lower than the transmitter frequency. Therefore, the relative speed of the target and the radar can be calculated by the change value of the frequency.

Compared with the common microwave radar, the laser radar has higher precision speed measurement performance due to the fact that the laser beam of the high-frequency electromagnetic wave is used, and the laser radar can be applied to calibration of the micro anemometer to obtain the micro anemometer with higher accuracy.

Therefore, the application designs a device for calibrating a micro anemometer by using laser measurement and a using method thereof so as to solve the problems.

Disclosure of Invention

The invention provides a device for calibrating a micro anemometer by using laser measurement and a using method thereof, aiming at making up the defects in the prior art.

The invention is realized by the following technical scheme:

a calibration device for a micro anemometer mainly comprises: the device comprises a variable diameter straight-path wind tunnel, a micro anemometer sample fixing and adjusting part, a micro anemometer sample profile measuring part, a laser Doppler velocimeter, a trace particle smoke generator, a display PLC controller and the like.

A bracket A, a bracket C and a bracket D are placed on a workbench with the temperature change of no more than +/-1 ℃ in a normal temperature laboratory to jointly support a variable diameter straight-path wind tunnel, the central line of the wind tunnel is horizontal, and the wind tunnel comprises an air inlet section, a damping section, an air inlet stabilizing section, a round variable square contraction section, a working section, a square variable round contraction section, an air outlet stabilizing section, a long horn mouth section, a wind fin rotating section and the like, wherein the air inlet stabilizing section, the round variable square contraction section, the working section, the square variable round contraction section, the air outlet stabilizing section, the long horn mouth section and the wind fin rotating section are of an integrated structure made of a PC (polycarbonate) transparent material. The entrance at the air inlet section is equipped with the protection network, is equipped with the honeycomb ware in the air inlet section, and the air inlet section is connected with the damping section through ring flange A, is equipped with the damping net in the damping section, and the damping section passes through the ring flange to be connected with the right-hand member of air inlet stable section. A hole C is formed in the upper portion of the middle of the length direction of the working section, the vertical center line of the hole C is intersected with the center line of a horizontal shaft of the wind tunnel, an anemoscope measuring head can be inserted downwards from the hole C, a lower sealing ring and an upper sealing ring can be inserted horizontally into a connecting rod of the anemoscope measuring head, a hole B is formed in the center of the lower sealing ring, a right gap is formed in the right of the major diameter of the lower sealing ring, a hole A is formed in the center of the upper sealing ring, a left gap is formed in the left of the major diameter of the upper sealing ring, the lower sealing ring is installed in the hole C and a fixing ring, the upper sealing ring is pressed on the lower sealing ring, the upper sealing ring can seal the right gap in the lower sealing ring, and the upper sealing ring and the lower sealing ring are both made of high-elasticity wear-resistant rubber. The top outside hole C is welded firmly to solid fixed ring, and the upper surface at last sealing washer is pressed to the lower surface of left clamp plate and right clamp plate, and left clamp plate and right clamp plate pass through the bolt-up on solid fixed ring, and the center of left clamp plate is equipped with half hole of left clamp plate, and the center of right clamp plate is equipped with half hole of right clamp plate, and two half holes are the connecting rod with the downthehole center that aligns the formation. Parallel and the wind-tunnel horizontal axis central line of portal frame's both sides door frame bottom and weld in solid fixed ring's both sides, be equipped with servo motor A at portal frame back timber middle part lower surface through the bolt, fixed axle sleeve A on motor shaft A has welded the horizontal connecting plate on axle sleeve A, pass through the perpendicular electric telescopic handle A of bolt fastening at the other end of horizontal connecting plate, pass through the fixed electric clamping jaw A of ring flange B at the lower extreme of flexible end A, the upper portion of two horizontal clamping jaw A centre gripping connecting rods.

The work of the electric telescopic rod A can enable the anemoscope measuring head to move up and down, and the work of the servo motor A can enable the anemoscope measuring head to rotate. Three pairs of wind fins in the wind fin rotating section are fixed on a long motor shaft B34, and a servo motor B is fixed on the bracket A through bolts. A bracket B is placed on the ground outside and behind the middle part of the working section, a servo motor C is arranged on the bracket B, a laser Doppler velocimeter is arranged on the shaft of the servo motor C, and a monitoring camera is further arranged on the upper part of the front of the bracket B. A tracer particle smoke emitter is arranged on the ground at the right end of the air inlet section, and a smoke outlet of the tracer particle smoke emitter is positioned right below the right end of the center line of the horizontal shaft of the wind tunnel. The smoke emitter, the electric clamping jaw A, the electric telescopic rod A, the micro anemoscope sample, the servo motor A, the servo motor B, the laser Doppler velocimeter, the servo motor C, the monitoring camera, the electric telescopic rod B, the high-speed profile measuring instrument, the electric clamping jaw B and other electric control wires are connected with the display PLC, and a calibration control program and image analysis software for the anemoscope measuring head are input to the PLC.

The use method of the speed measurement calibration device specifically comprises the following steps:

firstly, measuring and calculating the blocking ratio of the profile of a part of a sample of the micro anemometer entering a wind tunnel, namely a measuring head of the anemometer and the profile of a connecting rod, wherein the method comprises the following steps: the handle of the sample of the micro anemoscope is placed between the two parallel clamping jaws B, a profile measuring button in the PLC is pressed to display the sample of the micro anemoscope, the electric clamping jaw B works, the two clamping jaws B clamp the sample of the micro anemoscope, the high-speed profile measuring instrument works to emit a laser emitting surface to irradiate on the anemoscope measuring head and the connecting rod, the electric telescopic rod B works to enable the laser emitting surface emitted by the high-speed profile measuring instrument arranged at the upper end of the telescopic rod B to sweep the anemoscope measuring head and the connecting rod, the high-speed profile measuring instrument sends measured data to the PLC, and the blocking ratio is to be calculated.

Then, a button for displaying the finish of profile measurement in the PLC is pressed, an electric clamping jaw B works reversely, a anemoscope sample is taken down, an anemoscope measuring head of the anemoscope sample is vertically inserted into a fixing ring, the central line of a horizontal shaft of the anemoscope measuring head is overlapped with the central line of a horizontal shaft of a wind tunnel as far as possible, a right gap on a lower sealing ring is inserted into a connecting rod from left to right, a left gap on an upper sealing ring is inserted into the connecting rod from right to left above the lower sealing ring, the left pressing plate and the right pressing plate are aligned to be circular and are placed on an upper sealing ring in an upward direction, the left pressing plate and the right pressing plate are fastened on the fixing ring through bolts, the lower sealing ring is located in a hole C and the fixing ring, and the right gap on the lower sealing ring is sealed by the lower surface of the upper sealing ring.

Secondly, a start button in a PLC is pressed, each electric control component enters a working state, the PLC controls the electric clamping jaws A to work to enable the two clamping jaws A to clamp the connecting rod, the PLC starts the electric telescopic rod A to enable the central line of the horizontal shaft of the anemoscope measuring head to move to a position coinciding with the central line of the horizontal shaft of the wind tunnel according to image data provided by the monitoring camera, the servo motor A is started to enable the windward side of the anemoscope measuring head to be perpendicular to the central line of the horizontal shaft of the wind tunnel, and the PLC calculates an actual blockage ratio according to the actual insertion depth of the anemoscope measuring head and the connecting rod into a working section of the wind tunnel and the known area profile of the working section.

And thirdly, the PLC starts the servo motor B to rotate according to the programming, the three pairs of wind wings installed on the long motor shaft B rotate to enable the wind tunnel to form pressure difference from right to left, airflow overflow at the wind wing rotating section is controlled and guaranteed due to the adoption of the long motor shaft B, when the rotating speed and the working time of the servo motor B reach the programming set values, the PLC starts the tracer particle smoke emitter to enable a small amount of smoke to overflow from a smoke outlet, the smoke is the special particle diameter of the wind tunnel flow field, the particle diameter is 0.2-10 micrometers, and the smoke flows from the air inlet section to the working section and finally overflows through the wind wing rotating section due to the fact that negative pressure is formed at the right side of the wind tunnel.

And finally, when the wind speed in the working section of the wind tunnel is stable, the laser Doppler velocimeter measures the wind speed of the tracer particle smoke flowing through the anemoscope measuring head as a wind tunnel calibration value, and the calibration value is compared with the wind speed value measured by the anemoscope measuring head of the micro anemoscope sample to display a calibration result of the micro anemoscope sample made by the PLC. And finally, the PLC controls the tracer particle smoke emitter and related electric control components to stop working.

The invention has the beneficial effects that:

the invention utilizes the laser measurement technology, solves the problems of low calibration quality and low calibration efficiency of the existing anemoscope, and greatly improves the accuracy of the anemoscope.

Drawings

FIG. 1 is a front cross-sectional view of a device for calibrating a anemoscope of the present invention;

FIG. 2 is a top view of a device for calibrating a anemoscope of the present invention;

FIG. 3 is a side view of a device for calibrating a anemoscope of the present invention;

FIG. 4 is a cross-sectional view of A, B, C of FIG. 1 in accordance with the present invention;

FIG. 5 is an enlarged cross-sectional view of the upper seal ring of the present invention;

FIG. 6 is a top view of the upper seal ring of the present invention;

FIG. 7 is an enlarged cross-sectional view of the lower seal ring of the present invention;

FIG. 8 is a top view of the lower seal ring of the present invention;

FIG. 9 is an enlarged view of the left and right pressing plates according to the present invention;

FIG. 10 is a schematic view of a measuring anemoscope profile of the present invention;

FIG. 11 is an enlarged partial view of the operational section of the device for calibrating a anemoscope of the present invention;

in the figure, the position of the upper end of the main shaft,

1. a workbench, 2, a tracer particle smoke emitter, 3, a smoke outlet, 4, a protective net, 5, an air inlet section, 6, a honeycomb device, 7, flange plates A, 8, a damping section, 9, a damping net, 10, an air inlet stabilizing section, 11, a round-to-square contraction section, 12, a working section, 13, a right pressing plate, 14, an upper sealing ring, 15, electric clamping jaws A,16, flange plates B,17, telescopic ends A,18, electric telescopic rods A,19, a horizontal connecting plate, 20, a servo motor A,21, a motor shaft A,22, a door-type frame, 23, a shaft sleeve A,24, a micro anemometer sample, 25, clamping jaws A,26, a left pressing plate, 27, a lower sealing ring, 28, a fixing ring, 29, a square-to-round contraction section, 30, an air outlet stabilizing section, 31, a long horn mouth section, 32, a wind wing rotating section, 33, a wind wing, 34, a long motor shaft B,35, a servo motor B,36 and a bracket A, 37. the device comprises a display PLC (programmable logic controller), 38, brackets B,39, holes C, 40, brackets C,41, brackets D,42, a laser Doppler velocimeter, 43, servo motors C,44, a monitoring camera, 45, a left gap, 46, a right gap, 47, a wind tunnel horizontal axis central line, 48, an anemograph measuring head, 49, a connecting rod, 50, holes A, 51, holes B, 52, a left pressing plate central half hole, 53, a right pressing plate central half hole, 54, electric telescopic rods B, 55, telescopic ends B, 56, a high-speed profile measuring instrument, 57, a laser emitting surface, 58, clamping jaws B, 59 and an electric clamping jaw B.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "middle", "upper", "lower", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings or orientations or positional relationships conventionally laid out when products of the present invention are used, and are only used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present invention, it should be noted that the terms "disposed," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected unless otherwise explicitly stated or limited. Either mechanically or electrically. They may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Some embodiments of the invention are described in detail below with reference to the accompanying drawings. The embodiments described below and the features of the embodiments can be combined with each other without conflict.

Fig. 1-11 show a specific embodiment of the present invention, in which a bracket a36, a bracket C40, and a bracket D41 are placed on a workbench 1 to jointly support a variable diameter straight-path wind tunnel, the center line of the wind tunnel is horizontal, and the wind tunnel is composed of an air inlet section 5, a damping section 8, an air inlet stabilizing section 10, a round-to-square contracting section 11, a working section 12, a square-to-round contracting section 29, an air outlet stabilizing section 30, a long bellmouth section 31, and a wind fin rotating section 32.

The air inlet stabilizing section 10, the round-to-square contraction section 11, the working section 12, the square-to-round contraction section 29, the air outlet stabilizing section 30, the long bell mouth section 31 and the wind wing rotating section 32 are of an integrated structure made of a PC (polycarbonate) transparent material, a protective net 4 is arranged at an inlet of the air inlet section 5, a honeycomb device 6 is arranged in the air inlet section 5, the air inlet section 5 is connected with a damping section 8 through a flange A7, a damping net 9 is arranged in the damping section 8, and the damping section 8 is connected with the right end of the air inlet stabilizing section 10 through a flange. A hole C39 is formed in the upper portion of the middle portion of the working section 12 in the length direction, the vertical center line of the hole C39 is intersected with the horizontal shaft center line 47 of the wind tunnel, a wind speed instrument measuring head 48 can be downwards and vertically inserted through the hole C39, a lower sealing ring 27 and an upper sealing ring 14 can be horizontally inserted into a connecting rod 49 of the wind speed instrument measuring head 48, a hole B51 is formed in the center of the lower sealing ring 27, a right gap 46 is formed in the right side of the major diameter of the lower sealing ring 27, a hole A50 is formed in the center of the upper sealing ring 14, a left gap 45 is formed in the left side of the major diameter of the upper sealing ring 14, the lower sealing ring 27 is installed in the hole C39 and a fixing ring 28, the upper sealing ring 14 is pressed on the lower sealing ring 27, the upper sealing ring 14 can seal the right gap 46 in the lower sealing ring 27, and the upper sealing ring 14 and the lower sealing ring 27 are both made of high-elasticity wear-resistant rubber. The fixing ring 28 is welded on the top outside the hole C39, the lower surfaces of the left pressure plate 26 and the right pressure plate 13 are pressed on the upper surface of the upper sealing ring 14, the left pressure plate 26 and the right pressure plate 13 are fastened on the fixing ring 28 through bolts, the center of the left pressure plate 26 is provided with a left pressure plate half-hole 52, the center of the right pressure plate 13 is provided with a right pressure plate half-hole 53, and the centers of the holes formed by aligning the two half-holes 52 and 53 are provided with a connecting rod 49.

The bottom ends of door frames on two sides of the door type frame 22 are parallel to the center line 47 of a horizontal shaft of the wind tunnel and are welded on two sides of a fixing ring 28, a servo motor A20 is mounted on the lower surface of the middle of a top beam of the door type frame 22 through bolts, a shaft sleeve A23 is fixed on a motor shaft A21, a horizontal connecting plate 19 is welded on the shaft sleeve A23, a vertical electric telescopic rod A18 is fixed on the other end of the horizontal connecting plate 19 through bolts, an electric clamping jaw A15 is fixed on the lower end of an expansion end A17 through a flange B16, and the upper portion of a connecting rod 49 is clamped by the two horizontal clamping jaws A25. The electric telescopic rod A18 can enable the anemometer measuring head 48 to move up and down when working, and the servo motor A20 can enable the anemometer measuring head 48 to rotate when working.

Three pairs of wind fins 33 in the wind fin rotating section 32 are fixed on a long motor shaft B34, and a servo motor B35 is fixed on a bracket A36 through bolts. A bracket B38 is placed on the ground 1 at the outer rear part of the middle part of the working section 12, a servo motor C43 is arranged on the bracket B38, a laser Doppler velocimeter 42 is arranged on the shaft of the servo motor C43, and a monitoring camera 44 is also arranged at the front upper part of the bracket B38. The trace particle smoke emitter 2 is arranged on the ground at the right end of the air inlet section 5, and a smoke outlet 3 of the trace particle smoke emitter 2 is positioned right below the right end of a horizontal shaft center line 47 of the wind tunnel. The smoke emitter 2, the electric clamping jaw A15, the electric telescopic rod A18, the micro anemometer sample 24, the servo motor A20, the servo motor B35, the laser Doppler velocimeter 42, the servo motor C43, the monitoring camera 44, the electric telescopic rod B54, the high-speed profile measuring instrument 56, the electric clamping jaw B59 and other electric control wires are connected with the display PLC 37, and a calibration control program and image analysis software for the anemometer measuring head 48 are input into the PLC 37.

The specific use method of the embodiment is as follows:

first, the blocking ratio is measured and calculated from the profiles of the anemometer probe 48 and the tie bar 49, which are portions of the anemometer sample entering the wind tunnel, by the method of: the handle of the sample 24 of the micro anemometer is placed between the two parallel clamping jaws B58, a profile measuring button in the PLC 37 is pressed, the electric clamping jaw B59 works to clamp the sample 24 of the micro anemometer by the two clamping jaws B58, the high-speed profile measuring instrument 56 works to emit a laser emitting surface 57 to irradiate on the anemometer measuring head 48 and the connecting rod 49, the electric telescopic rod B54 works to enable the laser emitting surface 57 emitted by the high-speed profile measuring instrument 56 arranged at the upper end of the telescopic rod B55 to sweep the anemometer measuring head 48 and the connecting rod 49, the high-speed profile measuring instrument 56 sends measured data to the PLC 37, and the blockage ratio is to be calculated, see the attached figure 10.

Then, a contour measurement completion button in the display PLC controller 37 is pressed, the electric jaw B59 works in the reverse direction, the anemoscope sample 24 is taken down, the anemoscope probe 48 of the anemoscope sample 24 is vertically inserted into the fixing ring 28, the horizontal axis center line of the anemoscope probe 48 is overlapped with the horizontal axis center line 47 of the wind tunnel as much as possible, the right gap 46 on the lower seal ring 27 is inserted into the connecting rod 49 from left to right, the left gap 45 of the upper seal ring 14 is inserted into the connecting rod 49 from right to left above the lower seal ring 27, the left pressure plate 26 and the right pressure plate 13 are aligned into a circle and placed on the upper seal ring 14, the left pressure plate 26 and the right pressure plate 13 are fastened on the fixing ring 28 by bolts, the lower seal ring 27 is positioned in the hole C39 and the fixing ring 28, and the right gap 46 on the lower seal ring 27 is sealed by the lower surface of the upper seal ring 14.

Secondly, a start button in the display PLC 37 is pressed, each electric control component enters a working state, the PLC 37 controls the electric clamping jaw A15 to work to enable the two clamping jaws A25 to clamp the connecting rod 49, the PLC 37 starts the electric telescopic rod A18 to enable the horizontal axis center line of the anemometer measuring head 48 to move to a position overlapped with the horizontal axis center line 47 of the wind tunnel according to image data provided by the monitoring camera 44, the servo motor A20 is started to enable the windward side of the anemometer measuring head 48 to be perpendicular to the horizontal axis center line 47 of the wind tunnel, and the PLC 37 calculates an actual blockage ratio according to the depth of the anemometer measuring head 48 and the connecting rod 49 actually inserted into the wind tunnel working section 12 and the known area profile of the working section 12.

Thirdly, the PLC 37 starts the servo motor B35 to rotate by the long motor shaft B34 according to programming, the three pairs of wind fins 33 arranged on the long motor shaft B34 rotate to enable the wind tunnel to form pressure difference from right to left, the overflow of airflow at the wind fin rotating section 33 is controlled and guaranteed due to the adoption of the long motor shaft B34, when the rotating speed and the working time of the servo motor B35 reach the programming set values, the PLC 37 starts the trace particle smoke emitter 2 to enable the smoke outlet 3 to overflow a small amount of smoke, the smoke is the special particle diameter of the wind tunnel flow field of 0.2-10 microns, and the smoke flows from the air inlet section 5 to the working section 12 due to the negative pressure at the right side and finally overflows from the wind fin rotating section 32.

Finally, when the wind speed in the wind tunnel working section 12 is stable, the laser doppler velocimeter 42 measures the wind speed of the tracer particle smoke flowing through the anemometer measuring head 48 as a wind tunnel calibration value, and the calibration value is compared with the wind speed value measured by the anemometer measuring head 48 of the micro anemometer sample 24 to display the calibration result of the micro anemometer sample 24 made by the PLC controller 37. Finally the PLC controller 37 controls the tracer particle smoke emitter 2 and associated electrical control components to cease operation.

It should be noted that the above-mentioned "blockage ratio", also called "blockage ratio", refers to the ratio of the projected area of the experimental model on the experimental air duct cross section to the air duct cross section. The experimental model here refers to the anemometer probe 48 and the connecting rod 49 inserted into the wind tunnel as shown in fig. 11, and only after the actual blockage ratio is calculated, the measured wind speed can be corrected to compare the wind speed measured by the laser doppler velocimeter 42 with the wind speed measured by the anemometer lateral head 48.

The calibration principle of this embodiment is that the laser doppler velocimeter 42 irradiates the transparent air duct to measure the trace particle smoke moving with the wind in the air duct, that is, the wind speed in the air duct, and the trace particle smoke is used as the wind speed calibration value, and then compared with the wind speed obtained by the anemoscope measuring head 48 after calculation and correction of the blockage ratio, so as to display the accuracy of the anemoscope, if the deviation is large, the concentricity of the sensor rotating shaft of the anemoscope and the instrument rotating shaft is finely adjusted continuously or the parameters of the wind speed sensor are finely adjusted, and the like, until the measured wind speed is consistent with the wind speed measured by the air duct laser.

Finally, the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and other modifications or equivalent substitutions made by the technical solutions of the present invention by those of ordinary skill in the art should be covered within the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solutions of the present invention.