阅读说明：本技术 利用半导体制冷的测风激光雷达除湿装置及其工作方法 (Wind measurement laser radar dehumidification device utilizing semiconductor refrigeration and working method thereof ) 是由 郭雨桐 陈新明 陈松涛 吴忠伟 徐超 孟秀俊 詹彪 于 2020-06-16 设计创作，主要内容包括：本发明公开的一种利用半导体制冷的测风激光雷达除湿装置及其工作方法,属于测风激光雷达内部环境控制技术领域。壳体设在测风激光雷达内部,壳体上部开口,底部设有冷凝水出水口；壳体上部设有中隔板,半导体制冷元件连接在中隔板下部,并与壳体相对的两个侧面连接；半导体制冷元件连接有若干加热面翅片和制冷面翅片；双向风机设在加热面翅片上方；温湿度传感器设在壳体外部,通过控制系统控制双向风机的转向和半导体制冷元件的电流方向。装置结构简单、可靠性高,制造成本低、能耗小,在湿度大和温度低的环境中也能发挥良好的除湿作用,适用范围广；具有良好的应用前景。(The invention discloses a wind-measuring laser radar dehumidifying device utilizing semiconductor refrigeration and a working method thereof, and belongs to the technical field of internal environment control of wind-measuring laser radars. The shell is arranged in the wind measuring laser radar, the upper part of the shell is opened, and the bottom of the shell is provided with a condensed water outlet; the upper part of the shell is provided with a middle clapboard, and the semiconductor refrigeration element is connected to the lower part of the middle clapboard and is connected with two opposite side surfaces of the shell; the semiconductor refrigerating element is connected with a plurality of heating surface fins and refrigerating surface fins; the bidirectional fan is arranged above the heating surface fins; the temperature and humidity sensor is arranged outside the shell, and the steering of the bidirectional fan and the current direction of the semiconductor refrigeration element are controlled by the control system. The device has simple structure, high reliability, low manufacturing cost and low energy consumption, can play a good role in dehumidification in the environment with high humidity and low temperature, and has wide application range; has good application prospect.)

1. A wind measurement laser radar dehumidification device utilizing semiconductor refrigeration is characterized by comprising a semiconductor refrigeration element (1), a bidirectional fan (4), a shell (5), a control system (7) and a temperature and humidity sensor (8); the shell (5) is arranged inside the wind measurement laser radar, the upper part of the shell (5) is provided with an opening, the bottom of the shell is provided with a condensed water outlet (12), the condensed water outlet (12) is connected with a condensed water outlet pipe (6), and the condensed water outlet pipe (6) is communicated with the outside of the wind measurement laser radar; a middle partition plate (21) is arranged at the upper part of the shell (5), and two ends of the middle partition plate (21) are respectively connected with two opposite side surfaces of the shell (5); the semiconductor refrigeration element (1) is connected to the lower part of the middle partition plate (21), and two ends in the length direction are connected with two opposite side surfaces of the shell (5); the heating surface of the semiconductor refrigerating element (1) is connected with a plurality of heating surface fins (3), and the refrigerating surface of the semiconductor refrigerating element (1) is connected with a plurality of refrigerating surface fins (2); gaps are reserved among the semiconductor refrigerating element (1), the refrigerating surface fin (2), the heating surface fin (3) and the bottom of the shell (5); the bidirectional fan (4) is arranged above the heating surface fin (3); the temperature and humidity sensor (8) is arranged outside the shell (5), the semiconductor refrigeration element (1), the temperature and humidity sensor (8) and the bidirectional fan (4) are respectively connected with the control system (7), the control system (7) is connected with an external power supply, and the control system (7) can control the steering of the bidirectional fan (4) and the current direction of the semiconductor refrigeration element (1).

2. A lidar dehumidification device for wind measurement utilizing semiconductor refrigeration as claimed in claim 1, wherein the bottom of the housing (5) is funnel-shaped, and the condensed water outlet (12) is provided at the lowest point of the bottom of the housing (5).

3. A lidar device for detecting wind using semiconductor cooling according to claim 1, wherein the bottom of the housing (5) is arc-shaped, and the outlet (12) for condensed water is provided at the top of the arc.

4. The semiconductor-refrigeration-based wind lidar dehumidification device according to claim 1, wherein the upper opening of the housing (5) is horn-shaped.

5. The wind lidar dehumidification device using semiconductor refrigeration according to claim 1, wherein a plurality of cooling surface fins (2) are arranged in parallel, and a plurality of heating surface fins (3) are arranged in parallel.

6. A wind lidar dehumidification device utilizing semiconductor refrigeration as claimed in claim 5, wherein the number of the cooling surface fins (2) and the heating surface fins (3) is the same, and the cooling surface fins (2) and the heating surface fins (3) opposite to the cooling surface fins are positioned on the same straight line.

7. The wind lidar dehumidification device using semiconductor refrigeration as claimed in claim 1, wherein the heating surface of the semiconductor refrigeration element (1) is connected to the heating surface fins (3) by a heat conductive adhesive, and the cooling surface of the semiconductor refrigeration element (1) is connected to the cooling surface fins (2) by a heat conductive adhesive.

8. The wind lidar dehumidification device using semiconductor refrigeration according to claim 1, wherein the cooling surface fins (2) and the heating surface fins (3) are aluminum fins.

9. The dehumidification device of the wind lidar utilizing semiconductor refrigeration of claim 1, wherein the inner wall of the housing (5) is provided with an anti-dew layer.

10. The method for operating a dehumidification device for a lidar according to any of claims 1 to 9, further comprising:

a dehumidification humidity threshold value and a defrosting temperature threshold value are preset in the control system (7);

when a temperature and humidity sensor (8) detects that the humidity in the wind lidar reaches a dehumidification humidity threshold value, a dehumidification mode is started, a control system (7) starts a bidirectional fan (4) and a semiconductor refrigeration element (1), the bidirectional fan (4) rotates forwards to convey the air in the wind lidar into a shell (5), the semiconductor refrigeration element (1) refrigerates forwards, when the air flows through a refrigeration surface fin (2), the air meets condensation and is condensed into water drops, and the water drops are collected and then enter a condensate water outlet pipe (6) to be discharged through a condensate water outlet (12); after passing through the cooling surface fins (2), the air enters the semiconductor cooling element (1), the cooling surface fins (2), the heating surface fins (3) and gaps at the bottom of the shell (5) to flow, then passes through the heating surface fins (3), takes away heat of the heating surface and finally returns to the interior of the wind measuring laser radar to complete air flow circulation; the mode continuously works until the temperature and humidity sensor (8) detects that the dehumidification humidity is smaller than the dehumidification humidity threshold value;

when the temperature and humidity sensor (8) detects that the humidity in the wind measuring laser radar reaches a dehumidification humidity threshold value and the temperature reaches a defrosting temperature threshold value, the control system (7) controls the bidirectional fan (4) to rotate reversely, the semiconductor refrigerating element (1) performs reverse refrigeration, the refrigerating surface fins (2) are heated to defrost, the defrosting is condensed into water drops and then enters the condensate water outlet pipe (6) through the condensate water outlet (12) to be discharged, and the air carries the heat on the refrigerating surface fins (2) out of the shell (5); the mode continues to operate until the temperature and humidity sensor (8) detects that the defrost temperature is above the defrost temperature threshold.

Technical Field

The invention belongs to the technical field of control over the internal environment of a wind measurement laser radar, and particularly relates to a wind measurement laser radar dehumidifying device utilizing semiconductor refrigeration and a working method thereof.

Background

As a novel wind resource measuring device, the wind lidar has the advantages of being rapid in arrangement, movable, capable of adjusting the measuring height at will and the like, and plays an important role in the increasing wind resource evaluation process. Precision equipment such as a laser, an optical fiber and an industrial personal computer in the laser radar have extremely high requirements on the temperature and the humidity in a laser radar cavity. The temperature and humidity exceed a fixed range, and irreversible damage can be caused to precision equipment. Meanwhile, in the southwest mountain areas of China, the air humidity is high in autumn and winter, the temperature is low, and the phenomenon of condensation inside the laser measuring head is easy to occur under the condition that the cavity tightness is poor.

At present, the method for adjusting the temperature and the humidity in the laser radar cavity mainly adopts two measures of heating dehumidification and refrigeration dehumidification. The main technical approach of heating and dehumidification is that liquid water is heated to change phase into gas state by heating, and then forced flow of air inside and outside the cavity is performed by using devices such as a fan and the like, so as to achieve the purpose of dehumidification. The principle of refrigeration and dehumidification lies in that the original gaseous water vapor in the air is condensed into liquid state after reaching the dew point by utilizing refrigeration equipment, and then flows out through a flow guide pipe, so that the aim of reducing the relative humidity is fulfilled. The mainstream technology of the temperature and humidity regulation inside the laser radar is heating dehumidification. In the aspect of refrigeration and dehumidification, the technology of applying refrigerant cycle dehumidification is also partially applied, but the disadvantage of utilizing refrigerant cycle dehumidification lies in that need install the refrigerating system additional in laser radar inside, increased holistic complexity and weight, simultaneously also invisibly increased the risk that the system broke down, in addition, the vibrations of compressor during operation also has adverse effect to the precision and the degree of accuracy of laser radar self measurement.

Disclosure of Invention

In order to overcome the defects in the prior art, the invention aims to provide a wind lidar dehumidification device utilizing semiconductor refrigeration and a working method thereof, so that low energy consumption, high efficiency and intelligent control of the internal temperature and humidity environment of the wind lidar are realized.

The invention is realized by the following technical scheme:

the invention discloses a wind measurement laser radar dehumidifying device utilizing semiconductor refrigeration, which comprises a semiconductor refrigeration element, a bidirectional fan, a shell, a control system and a temperature and humidity sensor, wherein the semiconductor refrigeration element is arranged on the shell; the casing is arranged inside the wind measurement laser radar, the upper part of the casing is opened, the bottom of the casing is provided with a condensed water outlet, the condensed water outlet is connected with a condensed water outlet pipe, and the condensed water outlet pipe is communicated with the outside of the wind measurement laser radar; the upper part of the shell is provided with a middle clapboard, and two ends of the middle clapboard are respectively connected with two opposite side surfaces of the shell; the semiconductor refrigeration element is connected to the lower part of the middle partition plate, and two ends in the length direction are connected with two opposite side surfaces of the shell; the heating surface of the semiconductor refrigerating element is connected with a plurality of heating surface fins, and the refrigerating surface of the semiconductor refrigerating element is connected with a plurality of refrigerating surface fins; gaps are reserved among the semiconductor refrigerating element, the refrigerating surface fin, the heating surface fin and the bottom of the shell; the bidirectional fan is arranged above the heating surface fins; the temperature and humidity sensor is arranged outside the shell, the semiconductor refrigeration element, the temperature and humidity sensor and the bidirectional fan are respectively connected with the control system, the control system is connected with an external power supply, and the control system can control the steering of the bidirectional fan and the current direction of the semiconductor refrigeration element.

Preferably, the bottom of the shell is of a funnel-shaped structure, and the condensate water outlet is arranged at the lowest point of the bottom of the shell.

Preferably, the bottom of the shell is arc-shaped, and the condensed water outlet is arranged at the top of the arc.

Preferably, the upper opening of the housing is flared.

Preferably, the plurality of cooling surface fins are arranged in parallel, and the plurality of heating surface fins are arranged in parallel.

Further preferably, the number of the cooling surface fins is the same as that of the heating surface fins, and the cooling surface fins and the heating surface fins opposite to the cooling surface fins are positioned on the same straight line.

Preferably, the heating surface of the semiconductor refrigeration element is connected with the heating surface fins through heat-conducting glue, and the refrigerating surface of the semiconductor refrigeration element is connected with the refrigerating surface fins through heat-conducting glue.

Preferably, the cooling surface fins and the heating surface fins are aluminum fins.

Preferably, the inner wall of the shell is provided with an anti-dew layer.

The working method of the wind-measuring laser radar dehumidifying device utilizing semiconductor refrigeration comprises the following steps:

a dehumidification humidity threshold value and a defrosting temperature threshold value are preset in the control system;

when the temperature and humidity sensor detects that the humidity inside the wind measurement laser radar reaches a dehumidification humidity threshold value, a dehumidification mode is started, the control system starts the bidirectional fan and the semiconductor refrigeration element, the bidirectional fan rotates forwards to convey air inside the wind measurement laser radar into the shell, the semiconductor refrigeration element performs forward refrigeration, when the air flows through the refrigeration surface fins, the air meets the condensation and is condensed into water drops, and the water drops are collected and then enter the condensate water outlet pipe through the condensate water outlet to be discharged; after passing through the cooling surface fins, the air enters the semiconductor cooling element, the cooling surface fins and the gaps between the heating surface fins and the bottom of the shell to flow, then passes through the heating surface fins to take away the heat of the heating surface, and finally returns to the interior of the wind measuring laser radar to complete airflow circulation; the mode continuously works until the temperature and humidity sensor detects that the dehumidification humidity is smaller than the dehumidification humidity threshold value;

when the temperature and humidity sensor detects that the humidity in the wind measuring laser radar reaches a dehumidification humidity threshold value and the temperature reaches a defrosting temperature threshold value, the control system controls the bidirectional fan to rotate reversely, the semiconductor refrigerating element performs reverse refrigeration, the refrigerating surface fins are heated to defrost, the defrosting is condensed into water drops, the water drops enter the condensate water outlet pipe through the condensate water outlet to be discharged, and the air brings the heat on the refrigerating surface fins out of the shell; this mode continues until the temperature and humidity sensor detects that the defrost temperature is above the defrost temperature threshold.

Compared with the prior art, the invention has the following beneficial technical effects:

according to the wind-measuring laser radar dehumidifying device utilizing semiconductor refrigeration, the semiconductor refrigeration element is adopted to cool and dehumidify the interior of the wind-measuring laser radar, the original arrangement and measurement accuracy of the interior of the radar are not influenced, and the manufacturing, installation, operation and maintenance are facilitated; the temperature and humidity of the working environment are monitored in real time through a temperature and humidity sensor, the automation degree is high, and convenience and flexibility are realized; the bidirectional fan can force the airflow in the shell to flow, the semiconductor refrigeration element condenses the water vapor, and the functions of dehumidification and defrosting can be realized by controlling the steering of the bidirectional fan and the current direction of the semiconductor refrigeration element. The device has simple structure, high reliability, low manufacturing cost and low energy consumption, can play a good role in dehumidification in the environment with high humidity and low temperature, and has wide application range; has good application prospect.

Further, the bottom of the shell is of a funnel-shaped structure, and a condensate water outlet is formed in the lowest point of the bottom of the shell, so that condensate water can flow out conveniently and does not deposit in the shell.

Furthermore, the bottom of the shell is arc-shaped, so that air in the shell can flow conveniently, and dead angles are not generated; the condensed water outlet is arranged at the arc top, so that the condensed water can be conveniently discharged.

Furthermore, the upper opening of the shell is in a horn shape, the air inlet area is increased, the volume is shrunk and the speed is increased after air enters, and the air flows smoothly and efficiently in the shell.

Furthermore, the plurality of cooling surface fins are arranged in parallel, and the plurality of heating surface fins are arranged in parallel, so that air can uniformly flow through the cooling device, and the cooling device is high in efficiency and good in effect.

Furthermore, the number of the cooling surface fins is consistent with that of the heating surface fins, and the cooling surface fins and the heating surface fins opposite to the cooling surface fins are positioned on the same straight line, so that wind fields on two sides of the semiconductor cooling element are symmetrical and uniformly distributed, and air flow is facilitated.

Furthermore, the semiconductor refrigeration element is connected with the refrigeration surface fin and the heating surface fin through heat conducting glue, and the heat conducting efficiency is high.

Furthermore, the cooling surface fins and the heating surface fins are aluminum fins, so that the heat conduction efficiency is high.

Further, the inner wall of the shell is provided with an anti-condensation layer to prevent condensed water from silting up.

The working method of the wind-measuring laser radar dehumidifying device utilizing semiconductor refrigeration, disclosed by the invention, has the advantages of high automation degree and efficiency, capability of switching working modes according to different environments and wide application range.

Drawings

FIG. 1 is a schematic view of the overall structure of a wind lidar dehumidifier utilizing semiconductor refrigeration according to the present invention;

FIG. 2 is a schematic top view of the semiconductor cooling element connecting the cooling surface fins and the heating surface fins;

fig. 3 is a schematic structural diagram of the semiconductor refrigeration element.

In the figure: the refrigerating device comprises a semiconductor refrigerating element 1, a refrigerating surface fin 2, a heating surface fin 3, a bidirectional fan 4, a shell 5, a condensate water outlet pipe 6, a control system 7, a temperature and humidity sensor 8, a refrigerating power line 9, an air supply pipe section 10, an air return pipe section 11, a condensate water outlet 12, a power supply line 13, a signal transmission line 14, a N joint 15, a P joint 16, a refrigerating surface diversion strip 17, a heating surface diversion strip 18, a heating surface substrate 19, a refrigerating surface substrate 20 and a middle partition plate 21.

Detailed Description

The invention will now be described in further detail with reference to the following drawings and specific examples, which are intended to be illustrative and not limiting:

referring to fig. 1, the wind lidar dehumidifier using semiconductor refrigeration of the present invention includes a semiconductor refrigeration element 1, a bidirectional fan 4, a housing 5, a control system 7, and a temperature and humidity sensor 8. The shell 5 is arranged inside the wind lidar, preferably in the middle of the wind lidar, and is fixed through a mounting bracket. The shell 5 is nearly totally closed, and the upper part of the shell is opened, preferably, the upper part of the shell is in a horn shape; the bottom of the wind measuring laser radar is provided with a condensed water outlet 12, the condensed water outlet 12 is connected with a condensed water eduction tube 6, and the condensed water eduction tube 6 is communicated with the outside of the wind measuring laser radar; in one embodiment of the present invention, the bottom of the housing 5 is funnel-shaped, and the condensed water outlet 12 is disposed at the lowest point of the bottom of the housing 5. In another embodiment of the present invention, the bottom of the housing 5 is arc-shaped, and the condensed water outlet 12 is arranged at the top of the arc. Preferably, the shell 5 is integrally formed by insulating and heat-preserving materials such as engineering plastics, and the inner wall of the shell 5 is provided with an anti-exposure layer. And an inlet of a refrigeration power line 9 is reserved on the shell 5, so that the shell is convenient to insert.

A middle partition plate 21 is arranged at the upper part of the shell 5, two ends of the middle partition plate 21 are respectively connected with two opposite side surfaces of the shell 5, and airflow is blocked from transversely flowing at the top of the shell 5, so that an air supply pipe section 10 and an air return pipe section 11 are naturally formed in the shell 5, and the airflow organization is shown as an arrow in fig. 1; the intermediate partition 21 may be formed integrally with the housing 5; the semiconductor refrigeration element 1 is connected to the lower part of the middle partition plate 21, and two ends in the length direction are connected with two opposite side surfaces of the shell 5; as shown in fig. 2, a semiconductor refrigeration element 1 is connected with a plurality of heating surface fins 3 through heat-conducting glue, a refrigeration surface of the semiconductor refrigeration element 1 is connected with a plurality of refrigeration surface fins 2 through heat-conducting glue, the semiconductor refrigeration element 1, the refrigeration surface fins 2 and the heating surface fins 3 are bonded to form a whole and are jointly placed in a shell 5, the upper and lower height and the left and right width of the shell 5 are larger than the size after bonding, and the front and back thickness is the same as the size after bonding; preferably, the plurality of cooling surface fins 2 are arranged in parallel, the plurality of heating surface fins 3 are arranged in parallel, the number of the cooling surface fins 2 is consistent with that of the heating surface fins 3, and the cooling surface fins 2 and the heating surface fins 3 opposite to the cooling surface fins are positioned on the same straight line. The cooling surface fins 2 and the heating surface fins 3 are preferably aluminum fins with good heat conduction performance. Gaps are reserved among the semiconductor refrigerating element 1, the refrigerating surface fins 2, the heating surface fins 3 and the bottom of the shell 5; the bidirectional fan 4 is arranged above the heating surface fin 3; the temperature and humidity sensor 8 is arranged outside the shell 5, the semiconductor refrigeration element 1 is connected with the control system 7 through a refrigeration power line 9, an outer insulating material with good waterproof performance is wrapped outside the refrigeration power line 9, the temperature and humidity sensor 8 is connected with the control system 7 through a signal transmission line 14, the bidirectional fan 4 is connected with the control system 7 through a wire, and the control system 7 is connected with an external power supply through a power supply line 13 and can be accessed from the direct current side of the laser radar; the control system 7 comprises a controller, a plurality of relays, a rectifier bridge and a capacitor, and can control the steering of the bidirectional fan 4 and the current direction of the semiconductor refrigeration element 1.

As shown in fig. 3, the semiconductor refrigeration device 1 includes a plurality of PN junctions, a heating surface substrate 19, and a cooling surface substrate 20 connected in series. The heating surface substrate 19 and the refrigerating surface substrate 20 are formed by each PN junction comprising an N junction 15, a P junction 16, a refrigerating surface guide strip 17 and a heating surface guide strip 18. It should be noted that the cooling surface flow guide strip 17 is connected to the outflow end of the N junction 15 and the inflow end of the P junction 16 of the same PN junction at the same time, and the heating surface flow guide strip 18 is not connected to the N junction 15 and the P junction 16 inside the same PN junction but is connected to the outflow end of the P junction 16 of the previous PN junction and the inflow end of the N junction 15 of the next PN junction, respectively. Thereby, a series operation of a plurality of PN junctions is formed.

The working method of the wind-measuring laser radar dehumidifying device utilizing semiconductor refrigeration comprises the following steps:

a dehumidification humidity threshold value and a defrosting temperature threshold value are preset in the control system 7;

when the temperature and humidity sensor 8 detects that the humidity inside the wind lidar reaches a dehumidification humidity threshold value, a dehumidification mode is started, the control system 7 starts the bidirectional fan 4 and the semiconductor refrigeration element 1, the bidirectional fan 4 rotates forwards to convey the air inside the wind lidar into the shell 5 through the air supply pipe section 10, the semiconductor refrigeration element 1 performs forward refrigeration, the air is condensed into water drops when flowing through the refrigeration surface fins 2, and the water drops are collected and enter the condensate water outlet pipe 6 through the condensate water outlet 12 to be discharged; after passing through the cooling surface fins 2, the air enters the gaps among the semiconductor cooling element 1, the cooling surface fins 2, the heating surface fins 3 and the bottom of the shell 5 to flow, then passes through the heating surface fins 3 to take away the heat of the heating surface, and finally returns to the interior of the wind detection laser radar through the air return pipe section 10 to complete air flow circulation; after the mode continuously works for a period of time, the temperature and humidity sensor 8 detects the environmental parameters again and decides to start and stop.

When the temperature and humidity sensor 8 detects that the humidity inside the wind measurement laser radar reaches a dehumidification humidity threshold value and the temperature reaches a defrosting temperature threshold value, the control system 7 controls the bidirectional fan 4 to rotate reversely, the semiconductor refrigeration element 1 performs reverse refrigeration, the refrigeration surface fins 2 are heated for defrosting, the defrosting and the condensation are water drops, then the water drops enter the condensate water outlet pipe 6 to be discharged, and the air brings the heat on the refrigeration surface fins 2 out of the shell 5; the forward direction and the reverse direction are a cycle, and after the cycle is finished, the temperature and humidity sensor 8 is required to detect the environmental parameters again to determine the start, the stop and the mode.

The invention is further explained below with reference to a specific example:

the wind measuring laser radar of a certain model has the height of 1000mm, the length of 1200mm, the width of 650mm and the power of 200W, is supplied with 220V alternating current by mains supply, and uses 24V direct current voltage after internal voltage transformation and rectification. The laser radar is used for wind resource measurement in certain places in the southwest of China for a long time, and due to the fact that the temperature of the place is low in autumn and winter and the humidity of air is large, humidity adjustment in the laser radar is invalid, the phenomenon of condensation occurs in the interior of a lens, and the integrity rate and accuracy of wind measurement data are seriously affected.

Aiming at the problems, the invention is based on the Peltier effect, utilizes the principle of semiconductor refrigeration to carry out condensation and dehumidification, and effectively solves the problem of overhigh humidity in the cavity of the wind-measuring laser radar. The specific workflow is introduced as follows:

this device hangs through the mode of glue with the gasket and fixes at the inside top side of anemometry laser radar cavity, all leaves the gap around the distance cavity, makes things convenient for the air current to pass through. The condensed water eduction tube 6 extends to the bottom of the cavity, and the bottom of the cavity is additionally provided with a water containing tank for collecting condensed water. The device supplies power to the control system 7 and the temperature and humidity sensor 8 by means of a power supply line 13. The input to the control system 7 is 24VDC and the output is 4.5 VDC.

When the temperature and humidity sensor 8 detects that the relative humidity of the surrounding environment is greater than 60% and the ambient temperature is greater than 15 ℃, an electric signal is transmitted to the control system 7 through the signal transmission line 14. After the control system 7 continuously detects the signal for 5min, the forward power supply is switched on, the power is supplied to the semiconductor refrigeration element 1 and the bidirectional fan 4 through the refrigeration power line 9, the bidirectional fan 4 starts to be started and forms forced flow in cooperation with the natural structure of the shell 5, the gas flow direction is sequentially in the radar cavity, the air supply pipe section 10, the refrigeration surface fin 2, the lower part of the shell 5, the heating surface fin 3 and the air return pipe section 11 are finally sent back to the radar cavity. The power of two-way fan 4 is 5W, the size of semiconductor refrigeration component 1 is 40 x 2.4mm, rated voltage 4.5V, when two-way fan 4 opened, the refrigeration function was opened simultaneously to semiconductor refrigeration component 1, the electric current flows to P knot 16 from N knot 15, position that connects at both forms the cold effect, a plurality of PN knot establish ties, increase the cold effect, make refrigeration face base plate 20 temperature reduce, simultaneously, heating face base plate 19 temperature rise, for strengthening heat-conduction, refrigeration face base plate 20 and heating face base plate 19 outside are connected with refrigeration face fin 2 and heating face fin 3 through the heat conduction glue respectively. The sizes of the cooling surface fins 2 and the heating surface fins 3 are 40 × 1mm, the bonding directions are vertical, the fins are parallel to the paper surface, the front and the back of each level of fins are uniformly distributed, the top view is shown in fig. 2, and in the embodiment, the number of each surface of fin is 9. The air current is cooled when passing through the refrigeration surface fins 2, and is reduced to below the dew point, the gaseous water vapor is condensed into water, and the water drops to the lower part of the shell 5 through the refrigeration surface fins 2, and the lower part of the shell 5 is provided with a condensed water outlet 12 which is connected with a condensed water outlet pipe 6 and used for leading out condensed water. It is noted that the housing 5 near the condensate outlet 12 is slightly recessed downward for the convenience of condensate removal. After the air current passes through refrigeration face fin 2, flow from right to left along 5 inside below spaces of casing, rise along 5 left sides of casing, through heating face fin 3, take away the heat of heating face, then through return air pipe section 11, get back to in the laser radar cavity. After the whole device works for 120min, whether the device is started again is determined by detecting the ambient temperature and humidity again through the temperature and humidity sensor 8.

In the south-west mountain areas, the air humidity is high and the temperature is low, so that a low-temperature mode is required in addition to the normal mode. In the low temperature mode, the cooling surface fins 2 have a frosting phenomenon, so that a defrosting operation is required. The logic for the low temperature mode is as follows: when temperature and humidity sensor 8 detects that relative humidity is higher than 60% and the temperature is less than 15 degrees centigrade in the cavity, the low temperature mode is opened, transmit the temperature and humidity dual electric signal to control system 7 through signal transmission line 14, control system 7 continues to detect after the dual signal 5min, switch on the forward power supply, make the device start, after 120min of device forward work, control system 7 switches on the reverse power supply 10min, make two-way fan 4 reversal, semiconductor refrigeration component 1 electric current is reverse simultaneously, cold and hot face exchange, make former refrigeration face fin 2 be heated and defrosted. After the whole device finishes one cycle of work, whether the device is started again or not is determined by detecting the environment temperature and humidity again through the temperature and humidity sensor 8.

The control logic of the device can set a fixed operation period of each working mode as in the embodiment, and after the period is finished, whether to start the next period or not is determined according to the detection value of the temperature and humidity sensor 8, or the working mode is switched or the operation is stopped. The temperature and humidity sensor 8 can also be used for monitoring temperature and humidity values in real time, and determining a working mode or stopping operation according to measured data. The selection can be specifically carried out according to actual needs.

It should be noted that the above description is only a part of the embodiments of the present invention, and equivalent changes made to the system described in the present invention are included in the protection scope of the present invention. Persons skilled in the art to which this invention pertains may substitute similar alternatives for the specific embodiments described, all without departing from the scope of the invention as defined by the claims.