CN216925886U - Array type fiber bragg grating wind pressure sensor device for roadway - Google Patents
Array type fiber bragg grating wind pressure sensor device for roadway Download PDFInfo
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- CN216925886U CN216925886U CN202122418503.9U CN202122418503U CN216925886U CN 216925886 U CN216925886 U CN 216925886U CN 202122418503 U CN202122418503 U CN 202122418503U CN 216925886 U CN216925886 U CN 216925886U
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Abstract
The utility model provides an array fiber grating wind pressure sensor device for a roadway, which comprises the following components: the wind pressure sensor and the sensor compensation device are connected in series through optical fibers and then are connected with a signal input end of the fiber grating demodulator in an optical mode; the output end of the fiber bragg grating demodulator is electrically connected with the wireless module; the wireless module is in wireless communication connection with the remote monitoring system; the sensor compensation device is arranged among the selected multiple wind pressure sensors; the plurality of wind pressure sensors and the sensor compensation devices are arranged in the roadway and distributed along the extending direction of the roadway; the utility model is suitable for long-term monitoring and multipoint monitoring of the roadway.
Description
Technical Field
The utility model belongs to the technical field of long-term monitoring of mine roadway environment wind pressure, and particularly relates to an array fiber bragg grating wind pressure sensor device for a roadway.
Background
The wind pressure sensor is a commonly used sensor in current engineering, and is widely applied to the fields of tunnels, water conservancy, buildings, electric power, aviation and the like.
Present wind pressure sensor can the accurate measurement single-point wind pressure, but most all are difficult to accomplish long-term monitoring and multiple spot monitoring, and monitor in the tunnel especially return air tunnel for a long time, can make sensor accumulative total dust, long-term monitoring effect is not good enough, in addition, most existing sensing technology adopts metal foil gage to measure the wind pressure, when the wind pressure is less, its degree of accuracy has the limitation, simultaneously in the tunnel of complicated electromagnetism and acoustic environment, all there is the interference to resistance-type sensor, hall formula sensor, ultrasonic sensor. To sum up, lack a wind pressure sensor that can be in long-term multiple spot monitoring of tunnel and stability and interference killing feature are strong at present.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the defects in the prior art, and provides an array fiber grating wind pressure sensor device for a roadway, which is suitable for long-term monitoring and multipoint monitoring of the roadway.
The technical scheme adopted by the utility model is as follows: the utility model provides a tunnel is with array fiber grating wind pressure sensor device which characterized in that: the wind pressure sensor and the sensor compensation device are connected in series through optical fibers and then are connected with a signal input end of the fiber grating demodulator in an optical mode; the output end of the fiber grating demodulator is electrically connected with the wireless module; the wireless module is in wireless communication connection with the remote monitoring system; the sensor compensation device is arranged among the selected multiple wind pressure sensors; the plurality of wind pressure sensors and the sensor compensation devices are arranged in the roadway and distributed along the extending direction of the roadway; all the wind pressure sensors are used for feeding back changes of internal devices of the wind pressure sensors at the arrangement positions of the internal devices to the monitoring fiber grating demodulator, wherein the changes are generated by wind pressure influence; the sensor compensation device is used for feeding back the change generated by the influence of environmental factors except wind pressure on the internal devices of the sensor compensation device at the arrangement position of the monitoring fiber grating demodulator; the fiber bragg grating demodulator is used for calculating current wind pressure data in a roadway and relative positions of the wind pressure sensors and the sensor compensation devices according to feedback information of the plurality of wind pressure sensors and the sensor compensation devices, and sending the current wind pressure data and the relative position data of the wind pressure sensors and the sensor compensation devices to a remote monitoring system through a wireless module; the remote monitoring system is used for displaying the received current wind pressure data and the relative position data of the wind pressure sensor and the sensor compensation device.
In the technical scheme, the wind pressure sensor comprises a negative pressure cavity, a positive pressure cavity, an airtight film, a first pitot tube and a second pitot tube; the negative pressure cavity and the positive pressure cavity are coaxially arranged along the extending direction of the roadway to form an integrated cavity structure, and the positive pressure cavity is arranged at the front end of the negative pressure cavity; an air-tight film is arranged between the negative pressure cavity and the positive pressure cavity and is divided into two chambers; the first pitot tube is arranged in the positive pressure cavity, and the positive pressure cavity is communicated with the outside air through the first pitot tube; the extending direction of the first pitot tube is the same as the axial direction of the negative pressure cavity and the positive pressure cavity; the second pitot tube is arranged in the negative pressure cavity, and the negative pressure cavity is communicated with the outside air through the second pitot tube; the extending direction of the second pitot tube is vertical to the axial directions of the negative pressure cavity and the positive pressure cavity; the airtight film is provided with a fiber grating; the fiber bragg grating is arranged in the negative pressure cavity; the optical fiber grating serving as an internal device of the wind pressure sensor is optically connected with the optical fiber grating demodulator through an optical fiber; the fiber gratings of the wind pressure sensors are connected in series through optical fibers and then are optically connected with the signal input end of the grating demodulator.
In the technical scheme, the sensor compensation device comprises a negative pressure cavity, a positive pressure cavity, an airtight film, a fiber grating, a second pitot tube and a third pitot tube; the negative pressure cavity and the positive pressure cavity are coaxially arranged along the extending direction of the roadway to form an integrated cavity structure, and the positive pressure cavity is arranged at the front end of the negative pressure cavity; an air-tight film is arranged between the negative pressure cavity and the positive pressure cavity and is divided into two chambers; a positive pressure cavity in the sensor compensation device is internally provided with a third pitot tube and is communicated with the outside air through the third pitot tube; the extending direction of the third pitot tube is vertical to the axial direction of the negative pressure cavity and the positive pressure cavity; a second pitot tube is arranged in the negative pressure cavity, and the negative pressure cavity is communicated with the outside air through the second pitot tube; the extending direction of the second pitot tube is vertical to the axial direction of the negative pressure cavity and the positive pressure cavity; the airtight film is provided with a fiber grating; the fiber bragg grating is arranged in the negative pressure cavity; the fiber bragg grating in the sensor compensation device is used as an internal device of the sensor compensation device and is optically connected with the fiber bragg grating demodulator through optical fibers; the fiber gratings of a plurality of wind pressure sensors and the fiber gratings in the sensor compensation device are connected in series through optical fibers and then are optically connected with the signal input end of the grating demodulator.
In the technical scheme, the wind pressure sensor and the sensor compensation device both comprise a steering bearing and a fixed hollow rod which are coaxially arranged; the axial lines of the steering bearing and the fixed hollow rod are vertical to the axial lines of the negative pressure cavity and the positive pressure cavity; the fixed hollow rod is fixed on the inner wall of the roadway; the negative pressure cavity is connected with the fixed hollow rod through a steering bearing and realizes steering; the negative pressure cavity, the steering bearing and the fixed hollow rod are correspondingly matched with each other to be provided with a through hole for leading out an optical fiber.
In the technical scheme, the tail ends of the negative pressure cavities of the wind pressure sensor and the sensor compensation device are respectively provided with a tail wing, and the tail wings are fixedly connected with the negative pressure cavities through connecting rods; the extending direction of the connecting rod is the same as the axial direction of the negative pressure cavity; the wing surface of the tail wing is vertically arranged and is on the same plane with the axis of the negative pressure cavity; the empennage enables the first pitot tube to be always opposite to the wind flow direction, and the second pitot tube and the third pitot tube are always vertical to the wind flow direction; the empennage enables the gravity center of the wind pressure sensor and the fixed hollow rod to be on the same vertical line.
In the technical scheme, the pipe orifice of the first pitot tube positioned in the positive pressure cavity extends vertically upwards; the pipe orifice at the other end of the first pitot tube extends to the outside of the positive pressure cavity along the axial direction of the positive pressure cavity; the pipe orifice of the second pitot tube positioned in the negative pressure cavity extends along the axial direction of the negative pressure cavity; a pipe orifice at the other end of the second pitot tube vertically extends downwards to the cavity wall of the negative pressure cavity; the pipe orifice of the third pitot tube positioned in the positive pressure cavity extends along the axial direction of the positive pressure cavity; and the other end pipe orifice of the third pitot tube vertically extends downwards to the wall of the positive pressure cavity.
In the technical scheme, the positive pressure cavity and the negative pressure cavity of the wind pressure sensor and the sensor compensation device adopt dust-free glass as a cavity shell, and the surface of the positive pressure cavity and the negative pressure cavity is coated with inorganic nano silicon materials.
In the technical scheme, the positive pressure cavity and the negative pressure cavity of the wind pressure sensor and the sensor compensation device are connected through threads.
In the technical scheme, the air-tight films of the wind pressure sensor and the sensor compensation device are elastic films; the threaded structures of the positive pressure cavity and the negative pressure cavity of the wind pressure sensor and the sensor compensation device which are matched mutually clamp and tighten the air-tight film between the positive pressure cavity and the negative pressure cavity; the fiber grating is adhered to the center of the airtight film.
In the technical scheme, the fiber grating demodulator calculates the positions of all fiber gratings and the wind pressure change of the positions of the fiber gratings respectively according to the return time and the return center wavelength change of the fiber grating reflected light of each wind pressure sensor, and subtracts the system error measured by the fiber grating of the sensor compensation device to obtain the actual wind pressure change, and the fiber grating demodulator calculates the relative positions of the wind pressure sensors and the sensor compensation device according to the time length of the fiber grating reflected light of the sensor compensation device.
The utility model has the beneficial effects that: the utility model can avoid the influence of external factors such as dust, vibration, electromagnetic interference and the like of the roadway on the sensor, and is suitable for long-term monitoring and multipoint monitoring of the roadway. The utility model adopts the dust-free glass as the pitot tube and the sensor shell, dust in the roadway is not easy to adhere to the sensor or the pitot tube opening, and data drift in the long-term monitoring process is avoided. The utility model uses elastic film material as the substrate, avoids the damage of the internal structure of the sensor when blasting vibration, and adjusts the sensitivity of the deformation of the film by adjusting the force tightening the airtight film. The array fiber grating is used as a sensitive element, the propagation of light is not influenced by the electromagnetic environment, the electromagnetic interference is avoided in principle, the array fiber grating can identify the fiber gratings with different distances by matching with a demodulator, and the multipoint monitoring data transmission on one light path can be realized. The connection mode between the positive pressure cavity and the negative pressure cavity is convenient for disassembling and replacing the air tightness film and the fiber bragg grating. The design of the steering bearing support and the fixed hollow rod is convenient for leading out optical fibers. Wherein, the wind pressure distribution in the tunnel is convenient for monitor to the wind pressure mode that the wind pressure sensor is established ties and data transmission mode, and the wind pressure sensor series connection mode is simple, simple to operate.
Drawings
Fig. 1 is a schematic structural diagram of a preferred embodiment of an array type fiber grating wind pressure sensor device and a data transmission system thereof according to the present invention.
Fig. 2 is a schematic structural diagram of a preferred embodiment of the array type fiber bragg grating wind pressure sensor of the present invention.
Fig. 3 is a schematic structural diagram of a preferred embodiment of the airtight film of the arrayed fiber grating wind pressure sensor of the present invention.
Fig. 4 is a schematic structural view of a preferred example of the sensor compensation device of the present invention.
The device comprises a vacuum cavity 1, a positive pressure cavity 2, an airtight film 3, a tail wing 4, a steering bearing 5, a fixed hollow rod 6, a first pitot tube 7, a second pitot tube 8, a fiber grating 9, a fiber grating demodulator 10, a wireless module 11, a third pitot tube 12, a wind pressure sensor 13 and a sensor compensation device 14.
Detailed Description
The utility model will be further described in detail with reference to the drawings and specific embodiments, which are not intended to limit the utility model, for the clear understanding of the utility model.
As shown in fig. 1, the utility model provides an array fiber grating wind pressure sensor device for a roadway, which comprises a plurality of wind pressure sensors, a sensor compensation device, a fiber grating demodulator 10, a wireless module 11 and a remote monitoring system, wherein the wind pressure sensors and the sensor compensation device are connected in series through optical fibers and then are optically connected with a signal input end of the fiber grating demodulator 10; the output end of the fiber grating demodulator 10 is electrically connected with the wireless module 11; the wireless module 11 is in wireless communication connection with a remote monitoring system; the sensor compensation device is arranged between the two selected wind pressure sensors; the plurality of wind pressure sensors and the sensor compensation devices are arranged in the roadway and distributed along the extending direction of the roadway; all the wind pressure sensors are used for feeding back the change of internal devices of the wind pressure sensors at the arrangement positions of the wind pressure sensors, which is caused by the influence of wind pressure, to the monitoring fiber grating demodulator 10; the sensor compensation device is used for feeding back the change generated by the influence of environmental factors except wind pressure on the internal devices of the sensor compensation device at the arrangement position of the monitoring fiber grating demodulator 10; the fiber grating demodulator 10 is configured to calculate current wind pressure data in a roadway and relative positions of the wind pressure sensors and the sensor compensation devices according to feedback information of the plurality of wind pressure sensors and the sensor compensation devices, and send the current wind pressure data and the relative position data of the wind pressure sensors and the sensor compensation devices to a remote monitoring system through a wireless module 11; the remote monitoring system is used for displaying and storing the received current wind pressure data and the relative position data of the wind pressure sensor and the sensor compensation device. The fiber grating demodulator 10 has a function module for distinguishing fiber gratings 9 with different distances and calculating the light reflection time, and a conversion module for converting the reflected light signal into an electric wind pressure signal and identifying and calculating the change of the reflected light dominant frequency. The remote monitoring system performs data transmission with the fiber grating demodulator 10 through wireless network systems such as a cellular network and a WiFi network, and is realized through technologies such as HTML, and can realize monitoring in any place with internet. Only one temperature compensation device is needed for the same temperature area. The temperature compensation device in a certain temperature area is arranged between two adjacent wind pressure sensors selected in the area.
In the above technical solution, the fiber grating demodulator 10 calculates the positions of all the fiber gratings 9 and the wind pressure changes of the positions respectively according to the return time and the return center wavelength of the reflected light of the fiber grating 9 of each wind pressure sensor, and subtracts the system error measured by the fiber grating 9 of the sensor compensation device to obtain the actual wind pressure changes, and the fiber grating demodulator 10 calculates the relative positions of the wind pressure sensors and the sensor compensation device according to the time length of the reflected light of the fiber grating 9 of the sensor compensation device. When the data transmission system is used, the single wind pressure sensors are connected in series to form a series wind pressure sensor array, and the remote monitoring of the wind pressure change of the roadway can be realized.
As shown in fig. 2, the wind pressure sensor includes a negative pressure chamber 1, a positive pressure chamber 2, an airtight film 3, a first pitot tube 7, and a second pitot tube 8; the negative pressure cavity 1 and the positive pressure cavity 2 are coaxially arranged along the extending direction of the roadway to form an integrated cavity structure, and the positive pressure cavity 2 is arranged at the front end of the negative pressure cavity; an airtight film 3 is arranged between the negative pressure cavity 1 and the positive pressure cavity 2, and the airtight film 3 is divided into two cavities; the first pitot tube 7 is arranged in the positive pressure cavity 2, and the positive pressure cavity 2 is communicated with the outside air through the first pitot tube 7; the extending direction of the first pitot tube 7 is the same as the axial direction of the negative pressure cavity 1 and the positive pressure cavity 2; the second pitot tube 8 is arranged in the negative pressure cavity 1, and the negative pressure cavity 1 is communicated with the outside air through the second pitot tube 8; the extending direction of the second pitot tube 8 is vertical to the axial direction of the negative pressure cavity 1 and the positive pressure cavity 2; the airtight film 3 is provided with a fiber grating 9; the fiber bragg grating 9 is arranged in the negative pressure cavity 1; the optical fiber grating 9 is used as an internal device of the wind pressure sensor and is electrically connected with the optical fiber grating demodulator 10 through optical fibers; the fiber gratings 9 of the wind pressure sensors are connected in series through optical fibers and then are optically connected with the signal input end of the grating demodulator.
The fiber bragg grating 9 is arranged on the airtight film 3 and serves as a sensitive element, in the using process, the first pitot tube 7 is over against the direction of the wind flow, the second pitot tube 8 is perpendicular to the wind flow, pressure difference is formed between the positive pressure cavity 2 and the negative pressure cavity 1, the airtight film 3 is arranged between the two cavities, the airtight film 3 is sunken towards one side of the negative pressure cavity 1 under the action of the pressure difference at the two ends, the airtight film 3 generates strain, the fiber bragg grating 9 obtains tensile strain, the length change of a grid area of the fiber bragg grating 9 is measured through the fiber bragg grating demodulator 10, and the dynamic pressure of the wind flow is calculated through the relation between the length change of the grid area and the pressure.
In the technical scheme, the device also comprises a steering bearing 5 and a fixed hollow rod 6 which are coaxially arranged; the axial lines of the steering bearing 5 and the fixed hollow rod 6 are vertical to the axial lines of the negative pressure cavity 1 and the positive pressure cavity 2; the fixed hollow rod 6 is fixed on the inner wall of the roadway; the negative pressure cavity 1 is connected with a fixed hollow rod 6 through a steering bearing 5 and realizes steering; the negative pressure cavity 1, the steering bearing 5 and the fixed hollow rod 6 are correspondingly provided with through holes for leading out optical fibers in a matched mode. The bearing support enables the sensor to turn left and right, the fixed hollow rod 6 is used for fixing the sensor in a roadway, the bearing support and the hollow rod are provided with through holes for leading out optical fibers, and the through holes are jointly used for protecting the data transmission optical fibers so that the optical fibers penetrate into and penetrate out of the sensor
In the technical scheme, the tail end of the negative pressure cavity 1 is provided with the tail wing 4, and the tail wing 4 is fixedly connected with the negative pressure cavity 1 through the connecting rod; the extending direction of the connecting rod is the same as the axial direction of the negative pressure cavity 1; the wing surface of the tail wing 4 is vertically arranged and is on the same plane with the axis of the negative pressure cavity 1; the empennage 4 enables the first pitot tube 7 to be always opposite to the wind flow direction, and the second pitot tube 8 is always vertical to the wind flow direction; the tail fin 4 enables the wind pressure sensor to have the center of gravity on the same vertical line with the fixed hollow rod 6. The empennage 4 is used for controlling the wind pressure sensor to rotate left and right, the empennage 4 enables the first pitot tube 7 to be always opposite to the wind flow direction, and the second pitot tube 8 is always perpendicular to the wind flow direction.
The positive pressure cavity 2 is connected with the negative pressure cavity 1 through threads. The spiro union position is equipped with anti-skidding line, is convenient for install and change gas tightness film 3, welds between negative pressure chamber 1 and the fin 4, and control sensor focus and fixed well hollow rod 6 are on same vertical line, turn to 5 supports of bearing and fixed well hollow rod 6 and set up the through-hole so that the outside facility is connected to optic fibre.
In the technical scheme, the pipe orifice of the first pitot tube 7 positioned in the positive pressure cavity 2 extends vertically upwards; the other end pipe orifice of the first pitot tube 7 extends to the outside of the positive pressure cavity 2 along the axial direction of the positive pressure cavity 2; the pipe orifice in the first pitot tube 7 is vertically upward, so that condensed water or dirt and the like do not fall into the sensor. The pipe orifice of the second pitot tube 8 positioned in the negative pressure cavity 1 extends along the axial direction of the positive pressure cavity 2; and the other end pipe orifice of the second pitot tube 8 vertically extends downwards to the cavity wall of the negative pressure cavity 1. The pipe orifice of the second pitot tube 8 is vertically downward and is vertical to the direction of the wind flow, so that condensed water or dirt and the like do not fall into the sensor
In the technical scheme, the positive pressure cavity 2 and the negative pressure cavity 1 adopt dust-free glass as a cavity shell, and inorganic nano silicon materials are sprayed on the surfaces of the cavity shell. Because the dust-free glass is used as a sensor manufacturing material, the mouth of the pitot tube is difficult to block dust even if the sensor is monitored for a long time under the condition of dirty wind, and the monitoring result is credible for a long time. As a preferable example of the utility model, the glass is coated with a layer of inorganic nano silicon, and the glass is characterized in that the surface is a super-hydrophilic coating and has good dust resistance, does not depend on sunlight irradiation, and also acts in a completely dark environment to reduce the influence of dust in a roadway on the accuracy of the sensor.
In the technical scheme, the airtight film 3 is an elastic film; the thread structure of the positive pressure cavity 2 and the negative pressure cavity 1 which are mutually matched clamps and tightens the air-tight film 3 between the positive pressure cavity 2 and the negative pressure cavity 1; the fiber grating 9 is adhered to the center of the airtight film 3. When the air-tight film is used, the different tightening force of the air-tight film 3 is adjusted, and the sensitivity of the air pressure sensor can be adjusted.
As shown in fig. 4, the sensor compensation device is used for temperature compensation of the sensor and stress relaxation compensation of the airtight film 3 in long-term monitoring, and comprises a negative pressure cavity 1, a positive pressure cavity 2, the airtight film 3, a fiber grating 9, a second pitot tube 8, a third pitot tube 12, a tail fin 4, a steering bearing 5 and a fixed hollow rod 6; the first pitot tube 7 is not arranged in the positive pressure cavity 2 in the sensor compensation device, but a third pitot tube 12 is arranged in the positive pressure cavity 2 in the sensor compensation device, and the positive pressure cavity 2 in the sensor compensation device is communicated with the outside air through the third pitot tube 12; the third pitot tube 12 vertically extends downwards to the cavity wall of the positive pressure cavity 2; the pipe orifice of the third pitot tube 12 positioned in the positive pressure cavity 2 extends along the axial direction of the positive pressure cavity 2; the arrangement mode of other parts in the sensor compensation device is the same as that of the wind pressure sensor; the fiber bragg grating 9 in the sensor compensation device is used as an internal device of the sensor compensation device and is electrically connected with a fiber bragg grating demodulator 10 through optical fibers; the fiber grating 9 of a plurality of wind pressure sensors and the fiber grating 9 in the sensor compensation device are connected in series through optical fibers and then are optically connected with the signal input end of the grating demodulator. When the sensor compensation device is used, under the combined action of wind flow and the tail wing 4, the central axis of the sensor compensation device is always opposite to the wind flow direction, and the second pitot tube 8 and the third pitot tube 12 are both perpendicular to the wind flow direction. The pressure between the positive pressure cavity 2 and the negative pressure cavity 1 is equal, and the airtight film 3 cannot deform due to the action of wind flow pressure to further cause the change of the length of the grid region of the fiber grating 9. However, the change of the temperature in the tunnel, the long-term monitoring time, and the influence of the corrosive gas in the air on the airtight film 3, which causes the change of the length of the gate region of the fiber grating 9, have the same influence on the wind pressure sensor and the sensor compensation device, so that the sensor compensation device shown in fig. 4 can be provided to directly measure and eliminate the influence of the adverse factors for the accuracy of the long-term monitoring.
The utility model discloses an array fiber bragg grating wind pressure sensor device for a roadway, which is suitable for measuring the wind pressure change condition in a long roadway for a long time. Compared with other existing wind pressure sensors, the wind pressure sensor has the following innovations and advantages: the wind power generating device is suitable for various severe electromagnetic environments, vibration environments and pollution conditions in roadways, and the interior of the wind power generating device adopts an elastic airtight film, so that the roadways with different sensitivities and different wind speeds can be adapted to; the outside adopts dust-free glass, so that dust accumulation is avoided, and the problem of long-term monitoring data drift is solved; the air-tight film is positioned in the cavity, and no obvious gas flows in the cavity, so that the stability and the service life of the air-tight film and the fiber bragg grating are improved; the sensing element adopts the array type fiber bragg grating, light is used as an information transmission medium, the influence of a complex electromagnetic environment is avoided, the array type fiber bragg grating can realize multipoint simultaneous monitoring and use the light path of the same optical fiber, the loss of the optical fiber is reduced in long-distance monitoring, and the cost is saved; all circuits are concentrated in the fiber bragg grating demodulator, so that the influence of various vibrations in a roadway on the service life of the sensor is reduced; the monitoring of the roadway wind pressure data at any time and at any place is realized through the series connection of a plurality of wind pressure sensors, compensation facilities and fiber grating demodulators, the data transmission of wireless modules and a remote monitoring system.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent structural changes made by using the contents of the present specification and the drawings, or applied directly or indirectly to other related technical fields, are included in the scope of the present invention.
Claims (9)
1. The utility model provides a tunnel is with array fiber grating wind pressure sensor device which characterized in that: the wind pressure sensor and the sensor compensation device are connected in series through optical fibers and then are connected with a signal input end of the fiber grating demodulator in an optical mode; the output end of the fiber bragg grating demodulator is electrically connected with the wireless module; the wireless module is in wireless communication connection with the remote monitoring system; the sensor compensation device is arranged among the selected multiple wind pressure sensors; the plurality of wind pressure sensors and the sensor compensation devices are arranged in the roadway and distributed along the extending direction of the roadway.
2. The array type optical fiber grating wind pressure sensor device for the roadway according to claim 1, wherein: the wind pressure sensor comprises a negative pressure cavity, a positive pressure cavity, an airtight film, a first pitot tube and a second pitot tube; the negative pressure cavity and the positive pressure cavity are coaxially arranged along the extending direction of the roadway to form an integrated cavity structure, and the positive pressure cavity is arranged at the front end of the negative pressure cavity; an air-tight film is arranged between the negative pressure cavity and the positive pressure cavity and is divided into two chambers; the first pitot tube is arranged in the positive pressure cavity, and the positive pressure cavity is communicated with the outside air through the first pitot tube; the extending direction of the first pitot tube is the same as the axial direction of the negative pressure cavity and the positive pressure cavity; the second pitot tube is arranged in the negative pressure cavity, and the negative pressure cavity is communicated with the outside air through the second pitot tube; the extending direction of the second pitot tube is vertical to the axial direction of the negative pressure cavity and the positive pressure cavity; the airtight film is provided with a fiber grating; the fiber bragg grating is arranged in the negative pressure cavity; the fiber bragg grating serving as an internal device of the wind pressure sensor is electrically connected with the fiber bragg grating demodulator through an optical fiber; the fiber gratings of the wind pressure sensors are connected in series through optical fibers and then are optically connected with the signal input end of the grating demodulator.
3. The array type fiber bragg grating wind pressure sensor device for the roadway according to claim 2, wherein: the sensor compensation device comprises a negative pressure cavity, a positive pressure cavity, an airtight film, a fiber grating, a second pitot tube and a third pitot tube; the negative pressure cavity and the positive pressure cavity are coaxially arranged along the extending direction of the roadway to form an integrated cavity structure, and the positive pressure cavity is arranged at the front end of the negative pressure cavity; an air-tight film is arranged between the negative pressure cavity and the positive pressure cavity and is divided into two chambers; a positive pressure cavity in the sensor compensation device is internally provided with a third pitot tube and is communicated with the outside air through the third pitot tube; the extending direction of the third pitot tube is vertical to the axial direction of the negative pressure cavity and the positive pressure cavity; a second pitot tube is arranged in the negative pressure cavity, and the negative pressure cavity is communicated with the outside air through the second pitot tube; the extending direction of the second pitot tube is vertical to the axial direction of the negative pressure cavity and the positive pressure cavity; the airtight film is provided with a fiber grating; the fiber bragg grating is arranged in the negative pressure cavity; the fiber bragg grating in the sensor compensation device is used as an internal device of the sensor compensation device and is optically connected with the fiber bragg grating demodulator through optical fibers; the fiber grating of several wind pressure sensors and the fiber grating in the sensor compensator are connected in series via fiber and connected optically to the signal input of the grating demodulator.
4. The array type optical fiber grating wind pressure sensor device for the roadway according to claim 3, wherein: the wind pressure sensor and the sensor compensation device both comprise a steering bearing and a fixed hollow rod which are coaxially arranged; the axial lines of the steering bearing and the fixed hollow rod are vertical to the axial lines of the negative pressure cavity and the positive pressure cavity; the fixed hollow rod is fixed on the inner wall of the roadway; the negative pressure cavity is connected with the fixed hollow rod through a steering bearing and realizes steering; the negative pressure cavity, the steering bearing and the fixed hollow rod are correspondingly matched with each other to be provided with a through hole for leading out an optical fiber.
5. The array type optical fiber grating wind pressure sensor device for the roadway according to claim 3, wherein: the tail ends of the negative pressure cavities of the wind pressure sensor and the sensor compensation device are respectively provided with a tail wing, and the tail wings are fixedly connected with the negative pressure cavities through connecting rods; the extending direction of the connecting rod is the same as the axial direction of the negative pressure cavity; the wing surface of the tail wing is vertically arranged and is on the same plane with the axis of the negative pressure cavity; the empennage enables the first pitot tube to be always opposite to the wind flow direction, and the second pitot tube and the third pitot tube are always vertical to the wind flow direction; the empennage enables the gravity center of the wind pressure sensor and the fixed hollow rod to be on the same vertical line.
6. The array type optical fiber grating wind pressure sensor device for the roadway according to claim 4, wherein: the pipe orifice of the first pitot tube positioned in the positive pressure cavity extends vertically upwards; the pipe orifice at the other end of the first pitot tube extends to the outside of the positive pressure cavity along the axial direction of the positive pressure cavity; the pipe orifice of the second pitot tube positioned in the negative pressure cavity extends along the axial direction of the negative pressure cavity; a pipe orifice at the other end of the second pitot tube vertically extends downwards to the cavity wall of the negative pressure cavity; the pipe orifice of the third pitot tube positioned in the positive pressure cavity extends along the axial direction of the positive pressure cavity; and the other end pipe orifice of the third pitot tube vertically extends downwards to the wall of the positive pressure cavity.
7. The array type optical fiber grating wind pressure sensor device for the roadway according to claim 4, wherein: the positive pressure cavity and the negative pressure cavity of the wind pressure sensor and the sensor compensation device adopt dust-free glass as a cavity shell, and inorganic nano silicon materials are sprayed on the surface of the cavity shell.
8. The array type fiber bragg grating wind pressure sensor device for the roadway according to claim 4, wherein: the positive pressure cavity and the negative pressure cavity of the wind pressure sensor and sensor compensation device are connected through threads.
9. The array type optical fiber grating wind pressure sensor device for the roadway according to claim 7, wherein: the air-tight film of the wind pressure sensor and the sensor compensation device is an elastic film; the threaded structures of the positive pressure cavity and the negative pressure cavity of the wind pressure sensor and the sensor compensation device which are matched mutually clamp and tighten the air-tight film between the positive pressure cavity and the negative pressure cavity; the fiber grating is adhered to the center of the airtight film.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202122418503.9U CN216925886U (en) | 2021-10-08 | 2021-10-08 | Array type fiber bragg grating wind pressure sensor device for roadway |
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| CN202122418503.9U CN216925886U (en) | 2021-10-08 | 2021-10-08 | Array type fiber bragg grating wind pressure sensor device for roadway |
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| CN216925886U true CN216925886U (en) | 2022-07-08 |
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| CN113514087A (en) * | 2021-03-11 | 2021-10-19 | 武汉理工大学 | Fiber grating sensor for measuring wind pressure and vibration |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113514087A (en) * | 2021-03-11 | 2021-10-19 | 武汉理工大学 | Fiber grating sensor for measuring wind pressure and vibration |
| CN113514087B (en) * | 2021-03-11 | 2024-05-07 | 武汉理工大学 | Fiber bragg grating sensor for measuring wind pressure and vibration |
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