阅读说明：本技术 一种重力杆式光纤流量传感器及其流量检测方法 (gravity rod type optical fiber flow sensor and flow detection method thereof ) 是由 胡浩 钟丽琼 于 2019-09-10 设计创作，主要内容包括：本发明提供一种重力杆式光纤流量传感器及其流量检测方法,该传感器具有较小的结构、较高的精确度与可靠性、较好的适应性与互换性等,该传感器能适用于众多流体流量检测场合,将摆杆结构与光电传感原理相结合地应用于流量检测领域,输出信号经光电转换及信号处理计算后输出值将成倍变化,现对于传统的动力测量方式,能够十分明显的提高检测灵敏度,具有十分重要的实际应用价值,对新型流量传感器的设计与推广起到了极大的推动作用。属于流量检测领域。(the invention provides a gravity rod type optical fiber flow sensor and a flow detection method thereof, the sensor has smaller structure, higher accuracy and reliability, better adaptability and interchangeability and the like, the sensor can be suitable for a plurality of fluid flow detection occasions, the pendulum rod structure and the photoelectric sensing principle are combined to be applied to the flow detection field, the output value of an output signal is multiplied after photoelectric conversion and signal processing calculation, the detection sensitivity can be obviously improved for the traditional dynamic measurement mode, the sensor has very important practical application value, and the sensor plays a great promoting role in the design and popularization of a novel flow sensor. Belonging to the field of flow detection.)

1. the utility model provides a gravity rod formula optic fibre flow sensor, includes sensor probe (1), photoelectric converter (2) and signal processor (3), its characterized in that: the sensor probe (1) comprises a shell (11) and a gravity rod (12), a swing groove (13) with an opening at the lower end is formed in the shell (11), the gravity rod (12) comprises a rod part (121) and a gravity plate (122) which are vertically arranged, the rod part (121) is positioned in the swing groove (13), the upper end of the rod part (121) is hinged with the shell (11), the lower end of the rod part (121) extends out of the lower opening of the swing groove (13), the gravity plate (122) is fixed at the lower end of the rod part (121), the rod part (121) is in sealing connection with the lower opening of the swing groove (13) through a corrugated waterproof cloth (14), the middle section of the rod part (121) is a shading plate (1211), a light hole (1212) is formed in the middle part of the shading plate (1211), and incident optical fibers (15) and receiving optical fibers (16) which point to each other are respectively arranged on two opposite sides of the shading plate (1211) in the swing, the other end of the incident optical fiber (15) is provided with a light source (4) for coupling incident light, the other end of the receiving optical fiber (16) is connected with the photoelectric converter (2), and the photoelectric converter (2) is connected with the signal processor (3).

2. The gravity rod optical fiber flow sensor according to claim 1, wherein: during the swinging of the rod part (121) around the upper end, the light-transmitting holes (1212) all fall on the optical fiber path between the incident optical fiber (15) and the receiving optical fiber (16).

3. The gravity rod optical fiber flow sensor according to claim 1, wherein: the upper end of the rod part (121) is vertically fixed with a hinged rod (123), the hinged rod (123) is transversely arranged, and two ends of the hinged rod (123) are rotationally fixed in the swing groove (13) through bearings (124).

4. The gravity rod optical fiber flow sensor according to claim 1, wherein: a rolling shaft (125) is transversely fixed on the lower side of the light shielding plate (1211) on the rod part (121), the rolling shaft (125) swings along with the rod part (121), a roller groove (131) is formed in the swing groove (13) along the swing path of the rolling shaft (125), rollers (126) are rotatably arranged at two ends of the rolling shaft (125), and the rollers (126) are slidably arranged in the roller groove (131).

5. A gravity rod type optical fiber flow detection method is characterized in that: the method is characterized in that a swing groove (13) with an opening at the lower end is arranged in a shell (11), a rod part (121) which is vertically arranged is arranged in the swing groove (13), the upper end of the rod part (121) is hinged with the shell (11), the lower end of the rod part (121) extends out of the opening at the lower end of the swing groove (13), a gravity plate (122) is fixed at the lower end of the rod part (121), the middle section of the rod part (121) is a light shielding plate (1211), a light hole (1212) is arranged in the middle of the light shielding plate (1211), an incident optical fiber (15) and a receiving optical fiber (16) which point to each other are respectively arranged at two opposite sides of the light shielding plate (1211) in the swing groove (13), when the flow rate of fluid is detected, the device is arranged in the fluid, the gravity plate (122) which is vertically arranged in an initial state is vertical to the flow direction of the fluid, the gravity plate (122) is enabled to swing through impact the fluid, so, the output light intensity through the light hole (1212) is changed, the swing angle of the rod part (121) is calculated by detecting the variation of the light intensity, and the magnitude of the fluid pressure acting on the gravity plate (122) is further calculated, so that the value of the flow velocity can be calculated by a fluid mechanics formula, and the flow value is further calculated.

Technical Field

The invention relates to a gravity rod type optical fiber flow sensor and a detection method thereof, belonging to the field of flow detection.

Background

in modern industrial processes, especially automated processes, various sensors are often used to monitor and control various parameters of the process, to operate the equipment in a normal or optimal state, and to maximize the quality of the product. Sensors have also long penetrated extremely widespread fields such as industrial production, space development, marine exploration, environmental protection, resource investigation, medical diagnostics, biotechnology, and even cultural relic protection. The present invention is one of many classes of sensors-flow sensors. With the development of sensor technology, various flow sensors have appeared, and the most common ones are of a vane type, a vortex street type, a karman vortex type, a hot wire type, etc. However, sensors such as vane type, vortex street type, karman vortex type, hot wire type and the like mostly adopt the traditional dynamic measurement mode, have the limitations of low measurement precision, large energy consumption and the like, and cannot be well performed in many occasions.

Disclosure of Invention

The invention provides a gravity rod type optical fiber flow sensor, which aims to solve the problems that the conventional flow sensor mostly adopts a traditional dynamic measurement mode, has the limitations of low measurement precision, large energy consumption and the like, and cannot be well competent in many occasions.

In order to solve the problems, the gravity rod type optical fiber flow sensor comprises a sensor probe, a photoelectric converter and a signal processor, wherein the sensor probe comprises a shell and a gravity rod, a swing groove with an opening at the lower end is formed in the shell, the gravity rod comprises a rod part and a gravity plate which are vertically arranged, the rod part is positioned in the swing groove, the upper end of the rod part is hinged with the shell, the lower end of the rod part extends out of the opening at the lower end of the swing groove, the gravity plate is fixed at the lower end of the rod part, the rod part is connected with the opening at the lower end of the swing groove in a sealing way through corrugated waterproof cloth, such as corrugated rubber cloth, so that the opening at the lower end of the swing groove is sealed, the swing of the rod part is not influenced by adopting a deployable corrugated structure, the resistance to the rod part is negligible, the middle section of the rod part is a, an incident optical fiber and a receiving optical fiber which point to each other are respectively arranged on the two opposite sides of the shading plate in the swinging groove, a light source is arranged at the other end of the incident optical fiber and used for coupling incident light, the other end of the receiving optical fiber is connected with a photoelectric converter, and the photoelectric converter is connected with a signal processor.

in the sensor, the light-transmitting holes all fall on the optical fiber path between the incident optical fiber and the receiving optical fiber in the process that the rod part swings around the upper end.

In the sensor, the upper end of the rod part is vertically fixed with a hinged rod which is transversely arranged, and two ends of the hinged rod are rotationally fixed in the swing groove through bearings.

In the sensor, a rolling shaft is transversely fixed on the lower side of the light shielding plate on the rod part, the rolling shaft swings along with the rod part, a roller groove is formed in the swing groove along the swing path of the rolling shaft, rollers are rotatably arranged at two ends of the rolling shaft, and the rollers are slidably arranged in the roller groove.

The invention also provides a gravity rod type optical fiber flow detection method, which is characterized in that a swing groove with an opening at the lower end is arranged in a shell, a rod part vertically arranged is arranged in the swing groove, the upper end of the rod part is hinged with the shell, the lower end of the rod part extends out of the opening at the lower end of the swing groove, a gravity plate is fixed at the lower end of the rod part, the middle section of the rod part is a light screen, a light hole is arranged in the middle of the light screen, incident optical fibers and receiving optical fibers which point to each other are respectively arranged at two opposite sides of the light screen in the swing groove, when the flow of fluid is detected, the device is arranged in the fluid, the gravity plate vertically arranged in an initial state is vertical to the flow direction of the fluid, the fluid impacts the gravity plate to swing, so as to drive the light hole to swing, the output light intensity of the light hole is changed, the swing angle of the rod part is calculated, and then the magnitude of the fluid pressure acting on the gravity plate is calculated, so that the value of the flow velocity can be calculated by a fluid mechanics formula, and further the flow value is calculated.

Compared with the prior art, the sensor has the advantages that the sensor has a smaller structure, higher accuracy and reliability, and better adaptability and interchangeability, can be suitable for a plurality of fluid flow detection occasions, combines the swing rod structure and the photoelectric sensing principle and is applied to the flow detection field, the output value of an output signal is multiplied after photoelectric conversion and signal processing calculation, the detection sensitivity can be obviously improved for the traditional dynamic measurement mode, the sensor has very important practical application value, and the sensor plays a great promoting role in the design and popularization of a novel flow sensor.

Drawings

FIG. 1 is a schematic front view of the present invention;

3 FIG. 3 2 3 is 3 a 3 cross 3- 3 sectional 3 view 3 taken 3 along 3 line 3 A 3- 3 A 3 of 3 FIG. 31 3; 3

Fig. 3 is a schematic view of the gravity bar of fig. 2;

FIG. 4 is a schematic diagram of the variation of the intensity of the receiving fiber of the present invention;

Fig. 5 is a force analysis diagram of the gravity plate.

Detailed Description

To make the objects, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail with reference to the accompanying drawings, and it should be understood that the specific embodiments described herein are only for explaining the present invention and are not intended to limit the present invention.