CN114964029A - Shaft torsion detection system based on optical fiber measurement technology - Google Patents
Shaft torsion detection system based on optical fiber measurement technology Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/16—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/24—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet
- G01L1/242—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet the material being an optical fibre
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/0028—Force sensors associated with force applying means
- G01L5/0042—Force sensors associated with force applying means applying a torque
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
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Abstract
The invention provides an optical fiber measurement technology-based shaft torsion detection system, which comprises an optical interference demodulator (10), an optical branching system (20) and an optical fiber torsion sensor group (30); the optical fiber torsion sensor group (30) comprises a plurality of identical torsion sensors, and each torsion sensor consists of a first sensor and a second sensor; the first sensor comprises a first optical fiber circulator (31), a first optical fiber semi-reflecting mirror (32), a first optical fiber total reflecting mirror (33) and a first sensitive optical fiber (34); the second sensor comprises a second optical fiber circulator (35), a second optical fiber semi-reflecting mirror (36), a second optical fiber total reflecting mirror (37) and a second sensitive optical fiber (38). The detection system can realize the measurement of the total deformation of the transmission shaft (40), has the advantages of high measurement precision, insensitivity to temperature and pressure, electromagnetic interference resistance and the like, can directly obtain the result of the total deformation of the transmission shaft (40), and is simple to operate and small in measurement error.
Description
Technical Field
The invention relates to the technical field of optical fiber sensing, in particular to a shaft torsion detection system based on an optical fiber measurement technology.
Background
Axle torque force detection is one of the important contents of industrial engineering detection, and is widely applied to detection of vehicle power systems and industrial production systems, for example: the detection of the torsional deformation of the transmission shaft of the large motor, the detection of the torsional deformation of the transmission shaft of the machine tool and the like. The shaft torsion detection has important significance for improving the mechanical property of the rotating shaft, increasing the rotating speed of the rotating shaft and prolonging the service life of the rotating shaft.
At present, the shaft torsion detection system in the prior art usually measures the deformation of key points, and gives an evaluation of the deformation condition through algorithm analysis. The method is too dependent on the judgment and selection of the deformation concentration point, the direct measurement of the overall deformation of the measured object cannot be realized, the deformation concentration point is difficult to select, the test error is large, and the accuracy of the obtained test result is low; for example: the accuracy of the pasting position of the single-point sensors such as the strain gauge and the fiber bragg grating directly influences the test result, a large number of sensors are required to be arranged to detect the overall torsion of the shaft, the test workload is large, the operation is complex, the test error is large, the precision is low, and meanwhile, the influences of temperature, pressure, the surrounding environment electromagnetic interference and the like in the test process cannot be effectively avoided.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a shaft torsion detection system based on an optical fiber measurement technology, which can realize the measurement of the total deformation of a transmission shaft, has the advantages of high measurement precision, insensitivity to temperature and pressure, electromagnetic interference resistance and the like, can directly obtain the result of the whole deformation of the transmission shaft, and has the advantages of simple operation and small measurement error.
The purpose of the invention is realized by the following technical scheme:
the utility model provides a shaft torsion detecting system based on optical fiber measurement technique which characterized in that: the optical fiber torsion sensor comprises an optical interference demodulator, an optical branching system and an optical fiber torsion sensor group; the optical interference demodulator, the optical branching system and the optical fiber torsion sensor group are connected step by step;
the optical fiber torsion sensor group comprises a plurality of identical torsion sensors, and each torsion sensor consists of a first sensor and a second sensor; the first sensor comprises a first optical fiber circulator, a first optical fiber semi-reflecting mirror, a first optical fiber total reflecting mirror and a first sensitive optical fiber; the second sensor comprises a second optical fiber circulator, a second optical fiber semi-reflecting mirror, a second optical fiber total reflecting mirror and a second sensitive optical fiber; the first port of the first optical fiber circulator is connected with the optical branching system, the second port of the first optical fiber circulator is connected with the input end of the first optical fiber semi-reflecting mirror, the output end of the first optical fiber semi-reflecting mirror is connected with the input end of the first sensitive optical fiber, and the output end of the first sensitive optical fiber is connected with the first optical fiber total reflecting mirror; the third port of the first optical fiber circulator is connected with the first port of the second optical fiber circulator, the second port of the second optical fiber circulator is connected with the input end of a second optical fiber semi-reflecting mirror, the output end of the second optical fiber semi-reflecting mirror is connected with the input end of a second sensitive optical fiber, and the output end of the second sensitive optical fiber is connected with a second optical fiber total reflecting mirror; the third port of the second optical fiber circulator is connected with an optical detector in the optical interference regulator; the first sensitive optical fiber and the second sensitive optical fiber are wound on the same transmission shaft, and the first sensitive optical fiber and the second sensitive optical fiber are wound in opposite directions.
For further optimization, the optical interference adjuster further comprises an SLED light source, a third optical fiber circulator, a third optical fiber semi-reflecting mirror, a self-focusing lens, a stepping motor, a data acquisition card and a computer; the SLED light source sets up a port of third optic fibre circulator No. two ports of third optic fibre circulator with the input of third optic fibre semi-reflecting mirror is connected, the output of third optic fibre semi-reflecting mirror with from focusing lens is connected, and from focusing lens with form the air optical path between the speculum, speculum fixed mounting is on step motor, step motor and computer electricity are connected, utilize computer control step motor motion, data collection card respectively with optical detector computer electricity is connected.
For further optimization, the SLED light source adopts a light source with the central wavelength of 1310 nm; the third optical fiber circulator adopts an optical fiber circulator with the center wavelength of 1310 nm.
And further optimizing, the step motor adopts a linear step motor, and the reflector is dragged to do linear motion through the linear step motor so as to complete the scanning process.
For further optimization, the optical splitting system comprises a primary splitting subsystem or a multi-stage splitting subsystem, the primary splitting subsystem adopts any one of an optical switch, an optical fiber coupler or a multi-path optical fiber splitter, and the multi-stage splitting subsystem is realized by cascading a plurality of primary splitting subsystems; and the optical path switching of the optical branching system is controlled by an external software system.
In a further optimization, the optical interferometer demodulator, the optical branching system and the solid part of the optical fiber torsion sensor group are connected through connecting optical fibers.
Further optimization is carried out, the first sensitive optical fiber is wound in a clockwise direction, and the second sensitive optical fiber is wound in a counterclockwise reverse direction (the first sensitive optical fiber and the second sensitive optical fiber are wound on the same transmission shaft); and the optical path of the first sensitive optical fiber is l 1 The variation of the optical path is Deltal 1 The optical path of the second sensitive optical fiber is l 2 The variation of the optical path is Deltal 2 ；
Obtaining the torsional deformation delta l of the transmission shaft:
Δl＝Δl 1 -Δl 2 ；
when the transmission shaft is loaded by torque force in the clockwise direction, the first sensitive optical fiber is stretched under the action of the torque force, the optical path is lengthened, and delta l is obtained 1 Larger than zero, the second sensitive optical fiber is compressed under the action of torsion, the optical path is shortened, and delta l 2 Less than zero, Δ l ═ Δ l 1 -Δl 2 Is greater than 0; when the transmission shaft is loaded by torque in the counterclockwise direction, the first sensitive optical fiber is compressed under the action of the torque, the optical path is shortened, and the delta l 1 Is less than zero, the firstThe two sensitive optical fibers are stretched under the action of torque force, the optical path is lengthened, and delta l 2 If greater than zero, Δ l ═ Δ l 1 -Δl 2 ＜0；
That is, when Δ l is a positive value, it represents a clockwise torque (i.e. the same torque as the winding direction of the first sensitive optical fiber), and when Δ l is a negative value, it represents a counterclockwise torque (i.e. the same torque as the winding direction of the second sensitive optical fiber); and the magnitude of | Δ l | represents the magnitude of the torque.
The invention has the following technical effects:
the optical fiber is used as a sensor sensitive element of the axial torque force detection system, so that the strong electromagnetic field can be effectively immunized, the acid-base corrosion resistance is better, and the influence of environmental factors on measurement is greatly reduced; simultaneously, this application has optimized the structure of traditional michelson interferometer, has eliminated factors such as connecting fiber length and temperature deformation on the connecting fiber to measuring result's influence through introducing third optic fibre semi-reflecting mirror, first optic fibre semi-reflecting mirror, second optic fibre semi-reflecting mirror, has realized remote measurement. In addition, the first sensitive optical fiber and the second sensitive optical fiber are reversely wound, so that the superposition of measured values and the accumulation of shaft torsion deformation can be realized, the measurement error value is reduced, the measurement precision is improved, each point of the transmission shaft can be effectively measured, the problems of large measurement range deviation, large fluctuation and unstable measured value caused by uneven stress in the torsion process of the transmission shaft are avoided, the influence of factors such as temperature and pressure is removed through a differential effect, and the accuracy and the effectiveness of the measured values are ensured; and the length of the sensitive optical fiber can be adjusted to realize different measurement precision and measurement ranges.
The detection system can realize multipoint measurement based on a plurality of optical fiber torsion sensors by introducing the cooperation of the optical branching system and the optical fiber torsion sensor group, and the whole system is simple in structure, stable in performance and accurate in measurement.
Drawings
Fig. 1 is a schematic diagram of a shaft torque force detection system in an embodiment of the present application.
Fig. 2 is a structural diagram of an optical fiber torsion sensor in an embodiment of the present application.
Fig. 3 is a measurement schematic diagram of the optical fiber torsion sensor in the embodiment of the present application.
10, an optical interference demodulator; 100. connecting an optical fiber; 11. an SLED light source; 12. a third fiber optic circulator; 13. a third fiber optic half mirror; 14. a mirror; 15. a self-focusing lens; 16. a stepping motor; 17. an optical detector; 20. an optical branching system; 30. an optical fiber torsion sensor; 31. a first fiber optic circulator; 32. a first fiber optic half mirror; 33. a first fiber optic total reflector; 34. a first sensitive optical fiber; 35. a second fiber optic circulator; 36. a second fiber optic half mirror; 37. a second fiber optic holophote; 38. a second sensitive optical fiber; 40. a drive shaft.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example (b):
as shown in fig. 1 to 3, an axial torsion detection system based on optical fiber measurement technology is characterized in that: comprises an optical interference adjuster 10, an optical branching system 20 and an optical fiber torsion sensor group 30; the optical interference demodulator 10, the optical branching system 20 and the optical fiber torsion sensor group 30 are connected step by step;
the optical interference demodulator 10 includes an SLED light source 11, a third fiber circulator 12, a third fiber half-mirror 13, a reflector 14, a self-focusing lens 15, a stepping motor 16, an optical detector 17, a data acquisition card and a computer (the data acquisition card and the computer are not specifically labeled, and a data acquisition card and a computer commonly used in the art are adopted, and those skilled in the art can understand the data acquisition card and the computer); the SLED light source 11 is arranged at a first port of a third optical fiber circulator 12 (namely, the SLED light source is connected through a connecting optical fiber 100), a second port of the third optical fiber circulator 12 is connected with an input end of a third optical fiber semi-reflecting mirror 13 through a connecting optical fiber 100, an output end of the third optical fiber semi-reflecting mirror 13 is connected with a self-focusing lens 15 through a connecting optical fiber 100, an air optical path is formed between the self-focusing lens 15 and a reflecting mirror 14, namely, light emitted by the self-focusing lens 15 is reflected by the reflecting mirror 14 and then coupled back to the self-focusing lens 15 to form a scanning optical path, the reflecting mirror 14 is fixedly arranged on a stepping motor 16, the stepping motor 16 is electrically connected with a computer and is driven by the stepping motor 16 controlled by the computer, and a data acquisition card is respectively electrically connected with an optical detector 17 and the computer. The SLED light source 11 adopts a light source with the central wavelength of 1310 nm; the third optical fiber circulator 12 adopts an optical fiber circulator with the center wavelength of 1310 nm; the stepping motor 16 is a linear stepping motor, and the mirror 14 is dragged to make a linear motion by the linear stepping motor, so that the scanning process is completed.
The optical splitting system 20 includes a first-stage splitting subsystem or a multi-stage splitting subsystem, where the first-stage splitting subsystem employs any one of an optical switch, an optical fiber coupler, or a multi-path optical fiber splitter, and the multi-stage splitting subsystem is implemented by cascading multiple first-stage splitting subsystems; the optical path switching of the optical branching system is controlled by an external software system.
The optical fiber torsion sensor group 30 comprises a plurality of identical torsion sensors, and each torsion sensor comprises a first sensor and a second sensor; the first sensor comprises a first optical fiber circulator 31, a first optical fiber semi-reflecting mirror 32, a first optical fiber total reflecting mirror 33 and a first sensitive optical fiber 34; the second sensor comprises a second optical fiber circulator 35, a second optical fiber semi-reflecting mirror 36, a second optical fiber total reflecting mirror 37 and a second sensitive optical fiber 38; a first port of the first optical fiber circulator 31 is connected with the optical branching system 20 through a connecting optical fiber 100, a second port of the first optical fiber circulator 31 is connected with an input end of a first optical fiber semi-reflecting mirror 32 through a connecting optical fiber 100, an output end of the first optical fiber semi-reflecting mirror 32 is connected with an input end of a first sensitive optical fiber 34, and an output end of the first sensitive optical fiber 34 is connected with a first optical fiber total reflecting mirror 33; a third port of the first optical fiber circulator 31 is connected with a first port of the second optical fiber circulator 35 through a connecting optical fiber 100, a second port of the second optical fiber circulator 35 is connected with an input end of a second optical fiber semi-reflecting mirror 36 through the connecting optical fiber 100, an output end of the second optical fiber semi-reflecting mirror 36 is connected with an input end of a second sensitive optical fiber 38, and an output end of the second sensitive optical fiber 38 is connected with a second optical fiber total reflecting mirror 37; the third port of the second optical fiber circulator 35 is connected with the optical detector 17 through a connecting optical fiber 100 (shown in fig. 1 or fig. 3); the first sensitive fiber 34 and the second sensitive fiber 38 are wound on the same transmission shaft 40 and the first sensitive fiber 34 and the second sensitive fiber 38 are wound in opposite directions (as shown in fig. 2).
The detection method of the scheme specifically comprises the following steps:
the light emitted by the SLED light source 11 with the central wavelength of 1310nm is directly coupled into the first port of the third optical fiber circulator 12 and emitted from the second port; the light emitted from the second port enters a third fiber semi-reflecting mirror 13 and is divided into two parts according to a proportion, wherein one part of light is reflected back to the second port of the third fiber circulator 12, and the other part of light is projected to enter a self-focusing lens 15 and is emitted; the emitted light from the self-focusing lens 15 is reflected by the reflector 14, and then returns to the second port of the third optical fiber circulator 12 through the self-focusing lens 15 and the third optical fiber semi-reflecting mirror 13.
Both portions of light are coupled into the optical branching system 20 from the third port of the third optical fiber circulator 12, enter the first port of the first optical fiber circulator 31 through the optical branching system 20, and exit from the second port of the first optical fiber circulator 31, so as to be coupled into the optical fiber torsion sensor group 30.
In the optical fiber torsion sensor group 30, the light is reflected by the first optical fiber semi-reflecting mirror 32 and then divided into two parts of reflected light and transmitted light, the reflected light is coupled back to the second port of the first optical fiber circulator 31, the transmitted light is reflected by the first optical fiber total reflecting mirror 33 after passing through the first sensitive optical fiber 34, and finally returns to the second port of the first optical fiber circulator 31 through the first sensitive optical fiber 34 (i.e. the two parts of light are both re-coupled back to the second port of the first optical fiber circulator 31); the recoupled light passes through a port number three of a port number two of the first optical fiber circulator 31, is emitted through a port number three of the first optical fiber circulator 31, is coupled into a port number one of the second optical fiber circulator 35, is emitted from a port number two of the second optical fiber circulator 35, is coupled into the second optical fiber semi-reflecting mirror 36, is divided into two parts of reflected light and transmitted light after passing through the second optical fiber semi-reflecting mirror 36 again, the reflected light is directly coupled back to the port number two of the second optical fiber circulator 35, the transmitted light is reflected by the second optical fiber full-emitting mirror 37 after passing through the second sensitive optical fiber 38, and finally returns to the port number two of the second optical fiber circulator 35 through the second sensitive optical fiber 38 (namely, the two parts of light are re-coupled back to the port number two of the second optical fiber circulator 35); the recoupled light passes through the third port of the second fiber circulator 35 and finally enters the optical detector 17; after photoelectric conversion is completed in the optical detector 17, the electrical signals are collected by a data acquisition card and finally input to a computer, and the computer outputs a calculation result after operation to complete the measurement process.
The first sensitive fiber 34 is wound clockwise and the second sensitive fiber 38 is wound counterclockwise (the first sensitive fiber 34 and the second sensitive fiber 38 are both wound on the same transmission shaft 40, as shown in fig. 2); and the optical path length of the first sensitive fiber 34 is l 1 The variation of the optical path is Deltal 1 The optical path of the second sensitive fiber 38 is l 2 The variation of the optical path is Δ l 2 ；
Obtaining the torsional deformation Δ l of the propeller shaft 40:
Δl＝Δl 1 -Δl 2 ；
when the transmission shaft 40 is loaded with clockwise torque, the first sensitive optical fiber 34 is stretched under the torque, the optical path length is lengthened, and Δ l is 1 Larger than zero, the second sensitive optical fiber 38 is compressed under the action of torsion, the optical path is shortened, and delta l 2 Less than zero, Δ l ═ Δ l 1 -Δl 2 Is greater than 0; when the transmission shaft 40 is loaded with torque in the counterclockwise direction, the first sensitive optical fiber 34 is compressed under the action of the torque, the optical path is shortened, and Δ l 1 Less than zero, the second sensitive fiber 38 stretches under the action of torsion, the optical path is lengthened, and delta l 2 If greater than zero, Δ l ═ Δ l 1 -Δl 2 ＜0；
That is, when Δ l is a positive value, it represents a clockwise torque (i.e. the same torque as the winding direction of the first sensitive optical fiber), and when Δ l is a negative value, it represents a counterclockwise torque (i.e. the same torque as the winding direction of the second sensitive optical fiber); and the magnitude of | Δ l | represents the magnitude of the torque.
When the optical paths of the two beams are equal and the optical paths are different, the two beams can interfere with each other; therefore, the shaft torsion detection system judges when the two beams of light interfere and finds the position where the optical paths of the two beams of light are equal through the demodulation of the optical fiber torsion sensor, and the demodulation of the optical fiber torsion sensor is specifically as follows:
firstly, defining an optical path: an optical path formed by the light emitted by the SLED light source 11 after being reflected by the reflector 14, the first fiber total reflector 33 and the second fiber total reflector 36 and then reaching the optical detector 17 is defined as an optical path A and is denoted as L A (ii) a The optical path formed by the light emitted from the SLED light source 11 after being reflected by the third fiber half mirror 13, the first fiber half mirror 32 and the second fiber full mirror 37 and reaching the optical detector 17 is defined as an optical path B, which is denoted as L B (ii) a An optical path formed by light emitted by the SLED light source 11 after being reflected by the third fiber circulator 12, the third fiber half mirror 13, the first fiber circulator 31, the first fiber half mirror 32, the second fiber circulator 35 and the second fiber half reflector 36 and then reaching the optical detector is defined as a common optical path C (i.e., an optical path corresponding to the solid line optical path in fig. 3), which is denoted as L C (ii) a The optical path between the third fiber half mirror 13 and the mirror 14 is defined as a demodulation optical path D, denoted as L D ；
Then:
L A ＝l 1 +L C +L D ；
L B ＝l 2 +L C ；
then, the torsional deformation Δ l was measured: when the two beams interfere with each other, i.e. the optical paths of the two beams are equal, i.e. L A ＝L B At this time:
namely:
Δl＝Δl 1 -Δl 2 ＝-ΔL D ；
the torque deformation information when the two beams of light interfere can be directly obtained by reading the position of the stepping motor 16.
In addition, the influence of the temperature on the measurement data can be effectively avoided through the arrangement of the sensitive optical fibers (i.e. the first sensitive optical fiber 34 and the second sensitive optical fiber 38).
According to the formula of torsional deformation, delta l is equal to delta l 1 -Δl 2 (ii) a When considering the temperature effect, the total deformation is defined as Δ L:
ΔL＝(Δl 1 +Δl t1 )-(Δl 2 +Δl t2 )；
in the formula,. DELTA.l t1 And Δ l t2 Respectively, the temperature deformation of the first and second sensitive fibers 34 and 38;
when a torsional force acts,. DELTA.l 1 And Δ l 2 Always in opposite directions (due to the fact that the first sensitive fiber 34 and the second sensitive fiber 38 are wound in opposite directions), i.e.: Δ l 1 At increasing time,. DELTA.l 2 Decrease; Δ l 1 When decrease,. DELTA.l 2 Increasing; and temperature deformation delta l is generated when the temperature changes t1 And Δ l t2 Then, the magnitude of the strain caused by thermal expansion and contraction is independent of the winding direction of the optical fiber, i.e., Δ l t1 And Δ l t2 Substantially equal, then:
ΔL＝(Δl 1 +Δl t1 )-(Δl 2 +Δl t2 )＝Δl 1 -Δl 2 ＝Δl；
it can be seen that changes in temperature do not affect the measurement of torsional deformation.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. The utility model provides a shaft torsion detecting system based on optical fiber measurement technique which characterized in that: comprises an optical interference demodulator (10), an optical branching system (20) and an optical fiber torsion sensor group (30); the optical interference regulator (10), the optical branching system (20) and the optical fiber torsion sensor group (30) are connected step by step;
the optical fiber torsion sensor group (30) comprises a plurality of identical torsion sensors, and each torsion sensor consists of a first sensor and a second sensor; the first sensor comprises a first optical fiber circulator (31), a first optical fiber semi-reflecting mirror (32), a first optical fiber total reflecting mirror (33) and a first sensitive optical fiber (34); the second sensor comprises a second optical fiber circulator (35), a second optical fiber semi-reflecting mirror (36), a second optical fiber total reflecting mirror (37) and a second sensitive optical fiber (38); a first port of the first optical fiber circulator (31) is connected with the optical branching system (20), a second port of the first optical fiber circulator (31) is connected with an input end of a first optical fiber semi-reflecting mirror (32), an output end of the first optical fiber semi-reflecting mirror (32) is connected with an input end of a first sensitive optical fiber (34), and an output end of the first sensitive optical fiber (34) is connected with a first optical fiber total reflecting mirror (33); a third port of the first optical fiber circulator (31) is connected with a first port of a second optical fiber circulator (35), a second port of the second optical fiber circulator (35) is connected with an input end of a second optical fiber semi-reflecting mirror (36), an output end of the second optical fiber semi-reflecting mirror (36) is connected with an input end of a second sensitive optical fiber (38), and an output end of the second sensitive optical fiber (38) is connected with a second optical fiber total reflecting mirror (37); the third port of the second optical fiber circulator (35) is connected with an optical detector (17) in the optical interferometer (10); the first sensitive optical fiber (34) and the second sensitive optical fiber (38) are wound on the same transmission shaft (40), and the first sensitive optical fiber (34) and the second sensitive optical fiber (38) are wound in opposite directions.
2. The axial torsion detection system based on the optical fiber measurement technology as claimed in claim 1, wherein: the optical interference demodulator (10) further comprises an SLED light source (11), a third optical fiber circulator (12), a third optical fiber semi-reflecting mirror (13), a reflecting mirror (14), a self-focusing lens (15), a stepping motor (16), a data acquisition card and a computer; SLED light source (11) set up No. one port of third optic fibre circulator (12) No. two ports of third optic fibre circulator (12) with the input of third optic fibre semi-reflecting mirror (13) is connected, the output of third optic fibre semi-reflecting mirror (13) with from focusing lens (15) are connected, and from focusing lens (15) with form the air optical path between speculum (14), speculum (14) fixed mounting is on step motor (16), step motor (16) and computer electricity are connected, data acquisition card respectively with optical detector (17) computer electricity is connected.
3. The axial torsion detection system based on the optical fiber measurement technology as claimed in claim 1, wherein: the SLED light source (11) adopts a light source with the central wavelength of 1310 nm; the third optical fiber circulator (12) adopts an optical fiber circulator with the center wavelength of 1310 nm.
4. The axial torsion detection system based on the optical fiber measurement technology as claimed in claim 1, wherein: the stepping motor (16) adopts a linear stepping motor.
5. The axial torsion detection system based on the optical fiber measurement technology as claimed in claim 1, wherein: the optical splitting system (20) comprises a primary splitting subsystem or a multi-stage splitting subsystem, wherein the primary splitting subsystem adopts any one of an optical switch, an optical fiber coupler or a multi-path optical fiber splitter, and the multi-stage splitting subsystem is realized by cascading a plurality of primary splitting subsystems; the optical path switching of the optical branching system (20) is controlled by an external software system.
6. The axial torsion detection system based on the optical fiber measurement technology as claimed in claim 1, wherein: the optical interferometer (10), the optical branching system (20) and the optical fiber torsion sensor group (30) are connected through connecting optical fibers (100).
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| CN202210572743.0A CN114964029B (en) | 2022-05-25 | 2022-05-25 | Shaft torsion detecting system based on optical fiber measuring technology |
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