CN108663158B - Push-pull type optical fiber differential pressure sensor - Google Patents
Push-pull type optical fiber differential pressure sensor Download PDFInfo
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- CN108663158B CN108663158B CN201810865473.6A CN201810865473A CN108663158B CN 108663158 B CN108663158 B CN 108663158B CN 201810865473 A CN201810865473 A CN 201810865473A CN 108663158 B CN108663158 B CN 108663158B
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L13/00—Devices or apparatus for measuring differences of two or more fluid pressure values
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L11/00—Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by means not provided for in group G01L7/00 or G01L9/00
- G01L11/02—Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by means not provided for in group G01L7/00 or G01L9/00 by optical means
- G01L11/025—Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by means not provided for in group G01L7/00 or G01L9/00 by optical means using a pressure-sensitive optical fibre
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Abstract
The invention discloses a push-pull optical fiber differential pressure sensor which is insensitive to temperature, adjustable in measurement range, resistant to strong electromagnetic interference, flame-proof and explosion-proof, multiplexing, remote measurement, low in cost and stable in performance. The push-pull type optical fiber differential pressure sensor comprises an optical fiber adapter, an optical fiber self-focusing lens fixing device, a plane reflecting mirror fixing device, a support column, a balance beam, a transmission column, a packaging shell, an elastic metal corrugated pipe, a flange plate and a pressure-transmitting guide pipe; the push-pull type optical fiber differential pressure sensor has the advantages of low cost, stable performance and easy replacement and maintenance. In the use process, a set of wide spectrum light source and a set of photoelectric detector can be used by a plurality of sensors together, so that multipoint quasi-distribution measurement is realized; the system can form a telemetry network with an optical fiber transmission system, and realizes remote real-time monitoring and measurement.
Description
Technical Field
The invention relates to the technical field of optical fiber sensing, in particular to a push-pull optical fiber differential pressure sensor.
Background
It is well known that: a differential pressure sensor is a sensor that is used to measure the difference between two pressures, typically the pressure difference across a device or component. The differential pressure sensor has wide application in micro-flow measurement, leakage test, clean room monitoring, environment tightness detection, gas flow measurement, liquid level height measurement and other high-precision measurement occasions.
For example, in the field of seal detection, the application of differential pressure sensors to the detection of engine fuel injector tightness, the detection of tightness of an automobile brake master cylinder, and the like has been studied; in the fields of fluid flow research and fluid delivery engineering, differential pressure sensors can be used to accurately measure small pressure differences between two points where fluid flows; and in the field of highly accurate measurement of the level of liquids, differential pressure sensors can be applied to, for example, measurement and control of tap water level, oil level measurement of oil tanks and reservoirs in oil fields, refineries, and the like.
At present, the differential pressure sensor mainly comprises a piezoresistive sensor and a capacitive sensor, and the piezoresistive sensor has the outstanding advantages of simple structure and flat working end surface. However, such a sensor has many disadvantages in that there is a relatively prominent contradiction between sensitivity and frequency response, and that the temperature has a relatively large influence on the performance of such a sensor. The capacitive sensor has the advantages of simple structure, high sensitivity, good dynamic response characteristic, strong overload resistance, strong adaptability to severe conditions such as high temperature, radiation, strong vibration and the like, and becomes a sensor with development prospect. However, it has disadvantages and problems such as non-linearity of output characteristics, influence of parasitic capacitance and distributed capacitance on sensitivity and measurement accuracy, and relatively complex circuit connected to the sensor, which affect the reliability of the application thereof, and certain compensation and correction measures need to be taken, thus limiting its wide application.
Because the optical fiber sensing technology has the advantages of fire prevention, explosion prevention, high precision, low loss, small volume, light weight, long service life, high cost performance, good reusability, high response speed, electromagnetic interference resistance, wide frequency band range, large dynamic range, easiness in forming a telemetry network with an optical fiber transmission system and the like, the differential pressure sensor based on the optical fiber sensing technology has also been researched correspondingly. Japanese Seiichiro KINUGASA proposes a sensor such as an optical fiber differential pressure sensor KINUGASA Seiichiro.Fringe Amplitude Modulation Method for Differential Pressure Sensor[C]//IEEE SENSORS,EXCO Daegu,Korea,2006:22－25.. based on intensity modulation, in which light emitted from an incident optical fiber directly irradiates a reflector, and a reflected light signal received by a receiving optical fiber changes with a change in distance between the reflector and a receiving optical fiber end, so that a displacement or a rotation angle of the reflector can be determined by detecting intensity of the received light. This fiber optic sensor has two main disadvantages: firstly, the fluctuation of the light source intensity brings great errors to measurement, and secondly, the change of the reflectivity of the reflector surface along with time and the use environment also causes measurement inaccuracy. The Hao-Jan shaping et al of taiwan designed a differential pressure sensor SHENG Hao-Jan,LIU Wen-Fung,LIN Kuei-Ru,et al.High-sensitivity Temperature-independent Differential Pressure Sensor using Fiber Bragg Gratings[J].Optics Express,2008,16(20):16014－16018. based on fiber bragg grating, and applicant disclosed a fiber differential pressure wind speed sensor chinese patent in 2016: 201620800354.9, the fiber Bragg grating differential pressure sensor generates axial strain mainly according to the stress of the fiber Bragg grating, so that the wavelength of output light is changed, and the pressure difference is deduced by comparing the wavelength values of reflected light of the two sections of gratings. Because the pressure measurement is realized according to the axial strain of a single optical fiber, the sensor has the advantages of small measurement range and easy vibration interference although the sensitivity is very high.
Disclosure of Invention
The invention aims to solve the technical problem of providing a push-pull optical fiber differential pressure sensor which is insensitive to temperature, adjustable in measurement range, resistant to strong electromagnetic interference, flame-retardant and explosion-proof, multiplexing, remote in measurement, low in cost and stable in performance.
The technical scheme adopted for solving the technical problems is as follows: the push-pull type optical fiber differential pressure sensor comprises an optical fiber adapter, an optical fiber self-focusing lens fixing device, a plane reflecting mirror fixing device, a support column, a balance beam, a transmission column, a packaging shell, an elastic metal corrugated pipe, a flange plate and a pressure-transmitting guide pipe;
the packaging shell is provided with an inner cavity; the optical fiber adapter is arranged at the top of the packaging shell; the optical fiber self-focusing lens fixing device is arranged at the top of the inner cavity of the packaging shell; the optical fiber adapter is connected with the optical fiber self-focusing lens fixing device through optical fibers; the support column is vertically arranged in the inner cavity of the packaging shell, and the lower end of the support column is positioned in the middle of the lower surface of the inner cavity; the upper end of the support column is provided with a balance beam, and the middle position of the balance beam is hinged with the support column;
Elastic metal corrugated pipes are arranged on two sides of the support column; the top of the elastic metal corrugated pipe is provided with a transmission column, and the upper end of the transmission column is connected with one end of the balance beam; the upper end of the transmission column is provided with a plane reflector fixing device; the plane reflector fixing device is positioned right below the optical fiber self-focusing lens fixing device;
The bottom of the elastic metal corrugated pipe is fixed on the lower surface of the inner cavity through a flange plate; the bottom of the elastic metal corrugated pipe is provided with a pressure-through guide pipe.
Further, the plane reflector fixing device comprises a stud, an angle adjusting screw, a first rubber ring, a plane reflector, an upper mounting plate and a lower mounting plate;
the stud is arranged at the top of the upper mounting plate; the first rubber ring is arranged between the upper mounting plate and the lower mounting plate;
A transverse groove is formed in the upper mounting plate; two angle adjusting screws are arranged on the upper mounting plate and are respectively positioned on two sides of the stud; one angle adjusting screw is inserted into the lower mounting plate from the upper mounting plate and is matched with the lower mounting plate in a threaded manner; one end of the other angle adjusting screw is inserted into the mounting plate through the transverse groove and is in threaded fit with the lower mounting plate; the plane reflecting mirror is arranged on the lower bottom surface of the lower mounting plate.
Further, the optical fiber self-focusing lens fixing device comprises an optical fiber self-focusing lens, a second angle adjusting screw, a second rubber ring and a fixing seat; the optical fiber self-focusing lens is arranged at the upper end of the focusing lens mounting seat, and the focusing lens mounting seat is provided with a flange; the second angle adjusting screws are arranged on the flange and are at least three; one end of the second angle adjusting screw sequentially penetrates through the flange and the rubber ring to be inserted into the fixing seat and is in threaded fit with the fixing seat.
Further, an installation boss is arranged on the focusing lens installation seat, and an installation sleeve is sleeved on the installation boss; the mounting sleeve is provided with a fastening screw; the optical fiber self-focusing lens is arranged on the top of the installation boss.
The beneficial effects of the invention are as follows: the push-pull optical fiber differential pressure sensor has the following advantages:
1) The push-pull type optical fiber differential pressure sensor disclosed by the invention has the advantages that the active and passive devices are mutually separated, so that the sensor can work under severe environments such as strong electromagnetic interference, inflammability, explosiveness and the like.
2) According to the push-pull type optical fiber differential pressure sensor, the elastic metal corrugated pipe used by the sensor can be replaced according to actual requirements, so that the measuring range and the sensitivity can be adjusted.
3) The push-pull type optical fiber differential pressure sensor has the advantages of low cost, stable performance and easy replacement and maintenance.
Further, during use:
4) According to the push-pull type optical fiber differential pressure sensor, a set of wide-spectrum light source and a set of photoelectric detector can be used together by a plurality of sensors, so that multipoint quasi-distribution measurement is realized.
5) According to the push-pull type optical fiber differential pressure sensor, temperature errors are caused by space transmission of wide spectrum light on the scanning displacement table, but the space transmission distance of the sensor does not exceed 15cm, so that the errors caused by temperature can be ignored.
6) The push-pull type optical fiber differential pressure sensor can form a telemetry network with an optical fiber transmission system, and realizes remote real-time monitoring and measurement.
Drawings
FIG. 1 is a schematic diagram of a push-pull fiber differential pressure sensor in accordance with an embodiment of the present invention;
FIG. 2 is a perspective view of a fiber optic self-focusing attachment in accordance with an embodiment of the present invention;
FIG. 3 is a front view of a push mirror fixture in an embodiment of the present invention;
FIG. 4 is a top view of a push mirror fixture in an embodiment of the present invention;
FIG. 5 is a diagram of a measurement system of a push-pull fiber differential pressure sensor in an embodiment of the invention;
FIG. 6 is a graph of experimental data in an embodiment of the present invention;
The figures indicate: 1-a broad spectrum light source; 2-a photodetector; a 3-fiber coupler; 4-a first optical fiber jumper; 5-a second optical fiber jumper; 6-scanning the displacement table; 8-push-pull optical fiber differential pressure sensor; a 9-fiber optic adapter; 10-optical fiber self-focusing lens fixing device; 11-plane mirror fixing means; 12-supporting columns; 13-balance beams; 14-a transmission column; 15-packaging the shell; 16-elastic metal bellows; 17-a flange plate; 18-pressure-introducing conduit.
Detailed Description
The invention will be further described with reference to the drawings and examples.
As shown in fig. 1 to 6, the push-pull optical fiber differential pressure sensor according to the present invention comprises an optical fiber adapter 9, an optical fiber self-focusing lens fixing device 10, a plane mirror fixing device 11, a support column 12, a balance beam 13, a transmission column 14, a package shell 15, an elastic metal bellows 16, a flange 17 and a pressure-transmitting conduit 18;
The packaging shell 15 is provided with an inner cavity; the optical fiber adapter 9 is arranged on the top of the packaging shell 15; the optical fiber self-focusing lens fixing device 10 is arranged at the top of the inner cavity of the packaging shell 15; the optical fiber adapter 9 is connected with the optical fiber self-focusing lens fixing device 10 through an optical fiber; the support column 12 is vertically arranged in the inner cavity of the packaging shell 15, and the lower end of the support column 12 is positioned in the middle of the lower surface of the inner cavity; the upper end of the support column 12 is provided with a balance beam 13, and the middle position of the balance beam 13 is hinged with the support column 12;
Elastic metal bellows 16 are arranged on two sides of the support column 12; the top of the elastic metal corrugated pipe 16 is provided with a transmission column 14, and the upper end of the transmission column 14 is connected with one end of the balance beam 13; the upper end of the transmission column 14 is provided with a plane reflector fixing device 11; the plane reflector fixing device 11 is positioned right below the optical fiber self-focusing lens fixing device 10;
The bottom of the elastic metal corrugated pipe 16 is fixed on the lower surface of the inner cavity through a flange plate 17; the bottom of the elastic metal corrugated pipe 16 is provided with a pressure-through conduit 18.
For a better understanding of the measurement method, we will explain and explain in detail the linear relationship between the moving distance X of the self-focusing lens 71 on the needle scanning displacement stage and the pressure difference to be measured.
As shown in fig. 1, the pressure F1 is input to the left metal bellows 16 and the pressure F2 is input to the right metal bellows 16 of the sensor, and since the sensor is of a completely symmetrical structure and is made of the same material, the effects of temperature can be offset and ignored. Assuming that the pressure F1 is greater than the pressure F2, the left metal bellows 16 is axially stretched under the combined action of the pressure F1 and the pressure F2, the right metal bellows 16 is axially compressed, and the deformation is the same and linearly related to the pressure difference a between the pressure F1 and the pressure F2, which is designated as a x. The optical path difference of the sensor is changed by the change of the metal corrugated pipe, namely a xn1, wherein n 1 is the ambient refractive index of the differential pressure sensor.
To equalize the optical paths of the two arms of the sensor again, the position of the self-focusing lens 71 on the scanning displacement stage is moved until the main maximum of the white light interference fringes is observed again in the photodetector 2, at which point the movement distance is X, and the optical path change Xn 2, where n 2 is the refractive index of the environment in which the displacement stage is located.
The white light interference principle is:
axn1＝Xn2
when the sensor is in the same environment as the scanning displacement table, the method comprises the following steps of:
ax＝X
therefore, we can obtain the pressure difference a to be measured according to the moving distance X of the scanning displacement table.
In a specific application process:
Step one, building a system. A measurement system according to FIG. 5, wherein the measurement system is formed by connecting the devices; the measuring system comprises a broad spectrum light source 1, a photoelectric detector 2, an optical fiber coupler 3, a first optical fiber jumper 4, a second optical fiber jumper 5, a scanning displacement table 6, an optical fiber self-focusing lens 7 and an optical fiber differential pressure sensor 8; the wide spectrum light source 1 and the photoelectric detector 2 are respectively connected with an end a and an end b of the optical fiber coupler 3, an end c and an end d are respectively connected with a first optical fiber jumper 4 and a first self-focusing lens 71, and the other end of the first optical fiber jumper 4 is connected with an optical fiber adapter 9 in the optical fiber differential pressure sensor 8. The first self-focusing lens 71 is aligned with the second self-focusing lens 72 and both are on the scanning displacement stage 6, the second self-focusing lens 72 is fixed in position, the first self-focusing lens 71 is adjustable in position, and the second self-focusing lens 72 is connected to the fiber adapter 9 by the second fiber jumper 5.
Specifically, the broad spectrum light source 1 is one of an LED light source, an SLD/SLED light source and an ASE light source.
In the push-pull optical fiber differential pressure sensor 8, in a balanced state, the optical paths from the c end and the d end of the optical fiber coupler 3 to the mirror surface of the plane mirror 114 are equal, and the first self-focusing lens 71 is at about the center position of the effective moving distance of the scanning displacement table 6.
The lengths of the optical fiber jumpers 4 and 5 may be as short as several centimeters, or as long as several kilometers or more.
The push-pull type optical fiber differential pressure sensor mainly utilizes the optical fiber white light interference principle to realize the measurement of pressure difference, two corrugated pipes 6 in the sensor generate corresponding axial deformation under different pressure effects, so that the optical path lengths of two arms of the Michelson white light interferometer are changed, interference fringes are obtained again in the measuring system through the movement of a scanning displacement table 6, at the moment, the movement distance of the displacement table has a linear relation with the pressure difference, and the numerical value of the pressure difference to be measured can be obtained through data analysis.
The elastic metal bellows used in this example had an inner diameter of 50mm and a height of 100mm. The length of the optical fiber jumper 4 is 3m, and considering that the effective distance of movement of the scanning displacement table 6 is 0.2m, the length of the jumper 5 is designed to be 2.9m. The optical fiber self-focusing lenses inside the optical fiber differential pressure sensor 8 are respectively fixed at the same positions of the two optical fiber self-focusing fixing devices 10, the heights of the mirror surfaces of the two lenses are ensured to be the same, and the tail ends of the two lens surfaces are respectively connected with the optical fiber adapter 9. The silvered planar mirror is stuck to the mirror fixing device 11 by silicone rubber with the silvered face facing up.
And step two, light path collimation. The angle adjusting screws of the reflector fixing device 11 and the optical fiber self-focusing lens fixing device 10 are adjusted to ensure that the plane reflecting mirror surfaces are horizontal and the heights are the same, the mirror surfaces of the self-focusing lenses are horizontal and the heights are the same, and light rays vertically exit to the center of the reflecting mirror surfaces and are reflected back to the self-focusing lenses in the original way. By adjusting the angles of the first and second self-focusing lenses 71, 72 on the scanning displacement stage 6, it is ensured that the outgoing light from the first self-focusing lens 71 is substantially completely incident into the second self-focusing lens 72.
And thirdly, measurement initialization. The second self-focusing lens 72 of the optical fiber is fixed at one end of the scanning displacement table 6, the position of the first self-focusing lens 71 on the scanning displacement table 6 is adjusted until the central maximum of the white light interference fringes is displayed in the photodetector, and the position of the first self-focusing lens 71 at this time is recorded and calibrated to be zero.
And step four, measuring and testing by a sensor. In this embodiment, one end of the three-way rubber tube is connected with one conduit 181 of the optical fiber differential pressure sensor 8, the other two ends of the three-way rubber tube are respectively connected with a pressurizing air bag and a barometer purchased in the market, and the other conduit 182 of the optical fiber differential pressure sensor is communicated with the atmospheric pressure. After the scanning displacement table 6 is started, the pressure is gradually increased, and the position and the corresponding pressure of the first self-focusing lens 71 when the center of the white light interference fringe appears to be maximum are recorded. The three-way rubber tube was connected to a conduit 182, and the conduit 181 was vented to atmospheric pressure, and the test was repeated again to obtain FIG. 6.
In summary, the push-pull optical fiber differential pressure sensor of the invention has the following advantages:
1) The push-pull type optical fiber differential pressure sensor disclosed by the invention has the advantages that the active and passive devices are mutually separated, so that the sensor can work under severe environments such as strong electromagnetic interference, inflammability, explosiveness and the like.
2) According to the push-pull type optical fiber differential pressure sensor, the elastic metal corrugated pipe used by the sensor can be replaced according to actual requirements, so that the measuring range and the sensitivity can be adjusted.
3) The push-pull type optical fiber differential pressure sensor has the advantages of low cost, stable performance and easy replacement and maintenance.
Further, during use:
4) According to the push-pull type optical fiber differential pressure sensor, a set of wide-spectrum light source and a set of photoelectric detector can be used together by a plurality of sensors, so that multipoint quasi-distribution measurement is realized.
5) According to the push-pull type optical fiber differential pressure sensor, temperature errors are caused by space transmission of wide spectrum light on the scanning displacement table, but the space transmission distance of the sensor does not exceed 15cm, so that the errors caused by temperature can be ignored.
6) The push-pull type optical fiber differential pressure sensor can form a telemetry network with an optical fiber transmission system, and realizes remote real-time monitoring and measurement.
Specifically, the plane mirror fixing device 11 includes a stud 111, an angle adjusting screw 112, a first rubber ring 113, a plane mirror 114, and an upper mounting plate 115 and a lower mounting plate;
the studs 111 are arranged on the top of the upper mounting plate; the first rubber ring 113 is arranged between the upper mounting plate and the lower mounting plate;
in order to facilitate the adjustment of the angle of the plane mirror 114 and simplify the structure, further, the upper mounting plate 115 is provided with a transverse slot 116; two angle adjusting screws 112 are arranged on the upper mounting plate 115, and the two angle adjusting screws 112 are respectively positioned on two sides of the stud 111; one of the angle-adjusting screws 112 is inserted into the lower mounting plate from the upper mounting plate 115 and is in threaded fit with the lower mounting plate; one end of the other angle adjusting screw 112 is inserted into the mounting plate through the transverse groove 116 and is in threaded fit with the lower mounting plate; the planar mirror 114 is mounted to the lower bottom surface of the lower mounting plate.
In order to facilitate the adjustment of the angle of the optical fiber self-focusing lens 101 and simplify the structure, the optical fiber self-focusing lens fixing device 10 further comprises the optical fiber self-focusing lens 101, a second angle adjusting screw 103, a second rubber ring 104 and a fixing seat 105; the fixing base 105 is provided with a focusing lens mounting seat, the second rubber ring 104 is positioned between the fixing base 105 and the focusing lens mounting seat, the optical fiber self-focusing lens 101 is mounted at the upper end of the focusing lens mounting seat, and the focusing lens mounting seat is provided with a flange; the second angle adjusting screws 103 are arranged on the flange and are at least three; one end of the second angle adjusting screw 103 sequentially penetrates through the flange and the second rubber ring 104 to be inserted into the fixing seat 105, and is in threaded fit with the fixing seat 105.
In order to facilitate the installation and replacement of the optical fiber self-focusing lens 101, further, an installation boss is arranged on the focusing lens installation seat, and an installation sleeve is sleeved on the installation boss; the mounting sleeve is provided with a fastening screw 102; the optical fiber self-focusing lens 101 is mounted on top of the mounting boss.
Claims (2)
1. Push-pull type optic fibre differential pressure sensor, its characterized in that: the device comprises an optical fiber adapter (9), an optical fiber self-focusing lens fixing device (10), a plane reflector fixing device (11), a support column (12), a balance beam (13), a transmission column (14), a packaging shell (15), an elastic metal corrugated pipe (16), a flange plate (17) and a pressure-transmitting guide pipe (18);
The packaging shell (15) is provided with an inner cavity; the optical fiber adapter (9) is arranged at the top of the packaging shell (15); the optical fiber self-focusing lens fixing device (10) is arranged at the top of the inner cavity of the packaging shell (15); the optical fiber adapter (9) is connected with the optical fiber self-focusing lens fixing device (10) through an optical fiber; the support column (12) is vertically arranged in the inner cavity of the packaging shell (15), and the lower end of the support column (12) is positioned in the middle of the lower surface of the inner cavity; the upper end of the support column (12) is provided with a balance beam (13), and the middle position of the balance beam (13) is hinged with the support column (12);
Elastic metal corrugated pipes (16) are arranged on two sides of the supporting columns (12); the top of the elastic metal corrugated pipe (16) is provided with a transmission column (14), and the upper end of the transmission column (14) is connected with one end of the balance beam (13); the upper end of the transmission column (14) is provided with a plane reflector fixing device (11); the plane reflector fixing device (11) is positioned right below the optical fiber self-focusing lens fixing device (10);
the bottom of the elastic metal corrugated pipe (16) is fixed on the lower surface of the inner cavity through a flange plate (17); the bottom of the elastic metal corrugated pipe (16) is provided with a pressure-through guide pipe (18);
the plane reflector fixing device (11) comprises a stud (111), an angle adjusting screw (112), a first rubber ring (113), a plane reflector (114), an upper mounting plate (115) and a lower mounting plate;
the stud (111) is arranged at the top of the upper mounting plate; the first rubber ring (113) is arranged between the upper mounting plate and the lower mounting plate;
A transverse groove (116) is formed in the upper mounting plate (115); two angle adjusting screws (112) are arranged on the upper mounting plate (115), and the two angle adjusting screws (112) are respectively positioned at two sides of the stud (111); one angle adjusting screw (112) is inserted into the lower mounting plate from the upper mounting plate (115) and is in threaded fit with the lower mounting plate; one end of the other angle adjusting screw (112) is inserted into the mounting plate through the transverse groove (116) and is in threaded fit with the lower mounting plate; the plane reflecting mirror (114) is arranged on the lower bottom surface of the lower mounting plate;
The optical fiber self-focusing lens fixing device (10) comprises an optical fiber self-focusing lens (101), a second angle adjusting screw (103), a second rubber ring (104) and a fixing seat (105); the optical fiber self-focusing lens (101) is arranged at the upper end of the focusing lens mounting seat, and the focusing lens mounting seat is provided with a flange; the second angle adjusting screws (103) are arranged on the flange and are at least three; one end of the second angle adjusting screw (103) sequentially penetrates through the flange and the second rubber ring (104) to be inserted into the fixing seat (105) and is in threaded fit with the fixing seat (105).
2. The push-pull fiber differential pressure sensor of claim 1, wherein: a mounting boss is arranged on the focusing lens mounting seat, and a mounting sleeve is sleeved on the mounting boss; a fastening screw (102) is arranged on the mounting sleeve; the optical fiber self-focusing lens (101) is arranged on the top of the mounting boss.
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| CN109443629B (en) * | 2018-10-29 | 2024-05-28 | 西安精威士能源科技发展有限公司 | Differential pressure optical fiber probe structure and differential pressure optical fiber sensor thereof |
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