CN112129439A - Torsion sensor based on optical fiber light scattering induction - Google Patents
Torsion sensor based on optical fiber light scattering induction Download PDFInfo
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 37
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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
- 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
- G01L1/241—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 by photoelastic stress analysis
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L3/00—Measuring torque, work, mechanical power, or mechanical efficiency, in general
- G01L3/02—Rotary-transmission dynamometers
- G01L3/04—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft
- G01L3/08—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft involving optical means for indicating
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L3/00—Measuring torque, work, mechanical power, or mechanical efficiency, in general
- G01L3/02—Rotary-transmission dynamometers
- G01L3/04—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft
- G01L3/10—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft involving electric or magnetic means for indicating
- G01L3/12—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft involving electric or magnetic means for indicating involving photoelectric means
Abstract
The application provides a torsion sensor based on optic fibre light scattering response includes: a housing; the optical fiber module comprises a shaft body, wherein optical fibers are wound on the shaft body regularly; the incident end is connected with a first signal converter and used for converting the optical signal reflected to the incident end into a first digital signal; the emergent end is connected with a second signal converter which is used for converting the optical signal emitted by the emergent end into a second digital signal; and the conversion unit is used for extracting the corresponding torsion value from the stored corresponding relation information representing different characteristic value information and the torsion value according to the obtained characteristic value information based on the Brillouin scattering effect. This application is through the different scattering characteristics that light line light signal transmission produced in the stress channel (rotation axis) that change to conclude out the dependent stress and convert out concrete torsion, can avoid because of its signal fluctuation and other electromagnetic interference, reduce measuring error, practice thrift sensor cost and volume, greatly improved the precision and the degree of accuracy of torsion measurement.
Description
Technical Field
The invention relates to the technical field of torsion sensors, in particular to a torsion sensor based on optical fiber light scattering induction.
Background
The detection means of the torque test is a strain electrical measurement technology. The special torsion-measuring strain gauge is adhered to the elastic shaft to be measured by using strain glue to form a strain bridge, and the twisted electric signal of the elastic shaft can be tested if a working power supply is provided for the strain bridge. This is the basic torque sensor mode. However, in the rotary power transmission system, the most troublesome problem is how to reliably transmit the bridge pressure input of the strain bridge on the rotating body and the detected strain signal output between the rotating part and the stationary part, which is usually done by using an electrically conductive slip ring. Since the conductive slip ring is in frictional contact, abrasion and heat generation inevitably exist, so that the rotating speed of the rotating shaft and the service life of the conductive slip ring are limited, and signal fluctuation is caused due to unreliable contact, so that measurement errors are large and even measurement is unsuccessful.
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art, it is an object of the present application to provide a torsion sensor based on fiber optic light scattering sensing to solve at least one problem in the prior art.
To achieve the above and other related objects, there is provided a torsion sensor based on optical fiber light scattering sensing, the torsion sensor including: a housing; the shaft body is fixedly connected between the movable end bodies at the two ends of the shell; the movable end bodies at the two ends are respectively used for fixedly connecting a measured rotating shaft so as to drive the end body at the corresponding end to rotate when the measured rotating shaft at least one end rotates, so that the torsion is transmitted to the shaft body; optical fibers are wound on the shaft body regularly; one end of the optical fiber is an incident end, and the other end of the optical fiber is an emergent end; the incident end is connected with a first signal converter for converting an optical signal of the incident end into a first digital signal, wherein the optical signal is reflected back to the incident end by the pulse light emitted by the incident end due to light scattering; the exit end is connected with a second signal converter for converting the pulse light emitted by the incident end into a second digital signal through the optical signal emitted by the exit end; the conversion unit is used for obtaining characteristic value information based on the Brillouin scattering effect according to the first digital signal and the second digital signal, and extracting a corresponding torsion value from corresponding relation information which is stored in the conversion unit and represents different characteristic value information and the torsion value.
In an embodiment of the present application, when the shaft body deforms due to a torsion force, the optical fiber wound around the shaft body can be driven to stretch or displace to a certain degree, so that characteristic value information based on a brillouin scattering effect in an optical signal generated by the optical fiber changes.
In an embodiment of the present application, the characteristic value information based on the brillouin scattering effect includes: the peak value of the brillouin scattering light and the frequency difference of the brillouin scattering light.
In an embodiment of the application, the information representing the correspondence between the different characteristic values and the torque values is obtained by calculating strain forces corresponding to different peak values of the brillouin scattering light and frequency differences of the brillouin scattering light under a large number of different torque environments, and converting the strain forces into corresponding torque values, so as to obtain a correspondence table between the different peak values of the brillouin scattering light and frequency differences of the brillouin scattering light and actual torque values.
In an embodiment of the present application, the peak value of the brillouin scattering light and the frequency difference of the brillouin scattering light have a linear relationship with the actual torque value.
In an embodiment of the present application, the information representing the correspondence between the different characteristic values and the torque value includes: the peak value of brillouin scattered light and the frequency difference between brillouin scattered light in a zero-torque environment are characteristic value information at the time of shipment.
In an embodiment of the present application, at least a portion of the incident end, the exit end, the first signal converter, the second signal converter, and the scaling unit is disposed in the housing; or the incident end, the emergent end, the first signal converter, the second signal converter and the conversion unit are at least partially arranged outside the shell.
In an embodiment of the present application, the incident ends and the exit ends are multiple groups for emitting pulsed light with different frequencies.
In an embodiment of the present application, the torque sensor further includes: and the communication unit is used for communicating and transmitting the extracted torque force value to the instrument equipment or external equipment.
In an embodiment of the present application, the torque sensor further includes: and the stable power supply unit is used for supplying power to the optical fiber, the first signal converter, the second signal converter and the conversion unit.
To sum up, the torsion sensor based on optic fibre light scattering response of this application. This application is through the different scattering characteristics that light line light signal transmission produced in the stress channel (rotation axis) that change to conclude out the dependent stress and convert out concrete torsion, can avoid because of its signal fluctuation and other electromagnetic interference, reduce measuring error, practice thrift sensor cost and volume, greatly improved the precision and the degree of accuracy of torsion measurement.
Drawings
Fig. 1 is a schematic diagram illustrating a scenario of an application of the torsion sensor based on optical fiber light scattering sensing according to an embodiment of the present invention.
Fig. 2A is a schematic structural diagram of a torsion sensor based on optical fiber light scattering sensing according to an embodiment of the present invention.
Fig. 2B is a schematic structural diagram of a torsion sensor based on optical fiber light scattering sensing according to another embodiment of the present application.
Fig. 3 is a waveform diagram illustrating the brillouin effect according to an embodiment of the present application.
Fig. 4 is a schematic structural diagram of a plurality of sets of torque sensors at an incident end and an exit end according to an embodiment of the present disclosure.
Detailed Description
The following description of the embodiments of the present application is provided by way of specific examples, and other advantages and effects of the present application will be readily apparent to those skilled in the art from the disclosure herein. The present application is capable of other and different embodiments and its several details are capable of modifications and/or changes in various respects, all without departing from the spirit of the present application. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict.
It should be noted that the drawings provided in the following embodiments are only schematic and illustrate the basic idea of the present application, and although the drawings only show the components related to the present application and are not drawn according to the number, shape and size of the components in actual implementation, the type, quantity and proportion of the components in actual implementation may be changed at will, and the layout of the components may be more complex.
Throughout the specification, when a part is referred to as being "connected" to another part, this includes not only a case of being "directly connected" but also a case of being "indirectly connected" with another element interposed therebetween. In addition, when a certain part is referred to as "including" a certain component, unless otherwise stated, other components are not excluded, but it means that other components may be included.
The terms first, second, third, etc. are used herein to describe various elements, components, regions, layers and/or sections, but are not limited thereto. These terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the scope of the present application.
Also, as used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context indicates otherwise. It will be further understood that the terms "comprises," "comprising," and/or "comprising," when used in this specification, specify the presence of stated features, operations, elements, components, items, species, and/or groups, but do not preclude the presence, or addition of one or more other features, operations, elements, components, items, species, and/or groups thereof. The terms "or" and/or "as used herein are to be construed as inclusive or meaning any one or any combination. Thus, "A, B or C" or "A, B and/or C" means "any of the following: a; b; c; a and B; a and C; b and C; A. b and C ". An exception to this definition will occur only when a combination of elements, functions or operations are inherently mutually exclusive in some way.
Aiming at the condition that the slip ring is easy to appear, the design of the strain gauge and the slip ring is removed, and different scattering characteristics generated by transmission of light optical signals in a changed stress channel (a rotating shaft) are changed to induce strain force so as to convert specific torsion. The application mainly relates to a sensing technology which utilizes Brillouin scattering to perform stress analysis and reversely solves torsion according to stress image change, and the precision and the accuracy of the technology are greatly improved for the existing torsion measurement.
Fig. 1 is a schematic diagram illustrating a scenario of an application of the torsion sensor based on optical fiber light scattering sensing according to an embodiment of the present invention. As shown, the common usage scenarios of the torsion sensor 100 based on fiber optic light scattering sensing described in the present application include: the torque sensor 100 of the present application has two end-connected couplings 200, wherein one coupling 200 is used for connecting to the power device 300, and the other coupling 200 is used for connecting to the load device 400. The power device 300 outputs power to drive the rotation shaft to be tested to rotate, and then the two couplers 20 and the torque sensor 100 drive the load device 400 to operate. The rotating shaft to be tested may penetrate through the two couplers 20 and the torque sensor 100 and the integral rotating shaft of the load device 400, may be a segmented rotating shaft, and the segmented rotating shaft is coupled with the torque sensor 100 through the two couplers 20, respectively, so as to transmit the torque output by the power device 300 to the load device 400. The torque sensor 100 described herein is used to detect the torque value transmitted during the process.
Fig. 2A is a schematic structural diagram of a torsion sensor based on optical fiber light scattering sensing according to an embodiment of the present invention. As shown, the torque sensor 100 includes: a housing 110.
A shaft 120 fixedly connected between the movable end bodies at both ends of the housing 110; the movable end bodies at the two ends are respectively used for fixedly connecting a measured rotating shaft so as to drive the end body at the corresponding end to rotate when the measured rotating shaft at least one end rotates, so that the torsion is transmitted to the shaft body 120;
in this embodiment, the shaft body 120 is a rotating shaft with a sectional type, that is, the linkage of multiple rotating shafts is required in the process of transmitting the power output by the electric device 300300 to the load device 400400 in fig. 1. In some embodiments, the housing 110 is also detachable, the shaft 120 and the measured rotation axis are the same shaft 120, and the shaft 120 may penetrate through the movable end bodies at both ends of the housing 110.
An optical fiber 130 is regularly wound on the shaft body 120; the optical fiber 130 has an incident end and an exit end.
The principle on which this application is based is: when the shaft 120 deforms due to a torsional force, the optical fiber 130 wound thereon can be driven to stretch or displace to a certain degree, so that characteristic value information based on a brillouin scattering effect in an optical signal generated by the optical fiber 130 changes.
This application adopts optic fibre 130 to twine on axis body 120, through the rotation of axis body 120, gathers the light signal change that the rotation axis brought when rotating, and through data contrast back the torsion of asking. In the torque sensor 100 of the present application, the strain gauge and the conductive slip ring are removed, so that the problems of abrasion and heat generation caused by the friction contact of the conductive slip ring, and limitation of the rotating speed of the rotating shaft and the service life of the conductive slip ring, and the problem of large measurement error or even unsuccessful measurement caused by signal fluctuation due to unreliable contact can be avoided.
The incident end is connected with a first signal converter 141 for converting an optical signal of the incident end into a first digital signal, wherein the optical signal is reflected back to the incident end by the pulse light emitted by the incident end due to light scattering; the exit end is connected to a second signal converter 142 for converting the optical signal emitted from the exit end of the pulsed light emitted from the incident end into a second digital signal.
The conversion unit is used for obtaining characteristic value information based on the Brillouin scattering effect according to the first digital signal and the second digital signal, and extracting a corresponding torsion value from corresponding relation information which is stored in the conversion unit and represents different characteristic value information and the torsion value.
In an embodiment of the present application, the characteristic value information based on the brillouin scattering effect includes: the peak value of the brillouin scattering light and the frequency difference of the brillouin scattering light.
In short, when a pulse light is emitted to the optical fiber 130, the pulse light propagates forward at a speed slightly lower than the speed of light in vacuum, and scattered light is emitted to the periphery. A portion of the scattered light returns to the incident end along the optical fiber 130, and of the reflected light reflected back to the incident end, there is a light called Brillouin scattered light. The Brillouin scattered light contains two components: stokes (Stokes) light and Anti-Stokes (Anti Stokes) light. The intensity of the Stokes light is independent of stress and vibration, and the intensity of the Anti-Stokes light changes with temperature. Therefore, depending on the characteristics of the stokes light and the anti-stokes light, the peak value of the brillouin scattered light, and the frequency difference (or phase difference) can be obtained by testing the time at which the light pulse returns. It should be noted that although the brillouin scattering light exists in the scattering light reflected back to the incident light, the optical signal of the pulsed light emitted from the emitting end is also required to obtain the period or time of one pulsed light in the light, so as to integrate the optical signals to obtain the peak value of the brillouin scattering light and the frequency difference.
As shown in fig. 3, a waveform diagram showing the brillouin scattering effect is shown. As shown in the figure, the light signal with the highest energy is the incident light, and is only lower than the two peaks of the incident light, which are the peaks of the two brillouin scattering, and the peaks (or energies) of the two brillouin scattering are equal and respectively located on both sides of the incident light with the highest energy, and the front section of the peak of the left brillouin scattering is the stokes signal, whose energy is much lower than the peak of the brillouin scattering; the later part of the peak of the right brillouin scattering is a return stokes signal, and the energy of the return stokes signal is far lower than that of the brillouin scattering. Therefore, the time or position of the peak (or energy) of the brillouin scattering can be easily determined by the characteristics of the peak of the incident light, the stokes signal and the return stokes signal, and further, the frequency difference (or phase difference) of the brillouin scattering in one pulse period can be obtained.
According to the present application, the peak value of the brillouin scattering light and the frequency difference of the brillouin scattering light are mainly used as characteristic value information in the brillouin scattering effect, and then the optical fiber 130 is driven to stretch or displace to a certain extent when the shaft body 120 deforms due to torsion, so that the characteristic value information based on the brillouin scattering effect in the optical signal generated by the optical fiber 130 changes, and a corresponding torsion value is obtained.
In an embodiment of the present invention, the brillouin scattering peak value and the frequency difference of the brillouin scattering light have a linear relationship with the actual torque value.
In an embodiment of the application, the information representing the correspondence between the different characteristic values and the torque values is obtained by calculating the strain forces corresponding to the different brillouin scattering light peak values and the frequency differences of the brillouin scattering light under a large number of different torque environments, and converting the strain forces into corresponding torque values, so as to obtain a correspondence table between the different brillouin scattering light peak values and the frequency differences of the brillouin scattering light and actual torque values.
It should be noted that, according to the present application, the torque value corresponding to the characteristic value information based on the brillouin scattering effect is obtained according to the first digital signal and the second digital signal by fast extracting the corresponding relationship table of different characteristic value information and torque value, and compared with the field calculation, the memory requirement and the calculation time of the calculation device or the processing device can be greatly reduced, and the volume of the corresponding device can be greatly reduced. For the torque sensor 100, the available space of the scene used is often narrow, and therefore, the smaller the volume, the more advantageous.
In addition, a corresponding calculation method is known in the art for calculating the strain force corresponding to the peak value of the brillouin scattering light and the frequency difference between the brillouin scattering lights. Thus, the features of the present application are not dependent on this method. Only for different winding turns or winding densities of the optical fiber 130, the corresponding characteristic value information and the torque force value correspondence relationship are calculated respectively.
For example, the scaling unit described herein only stores a table of correspondence relationship information between characterization difference characteristic value information and a torque value, which is calculated in advance through a large number of tests, and then the scaling unit obtains characteristic value information based on the brillouin scattering effect only through the acquired first digital signal and second digital signal, and then extracts a corresponding torque value from the correspondence relationship information table according to the characteristic value information. In addition, it is a prior art in the art to calculate the peak value of the brillouin scattering light and the strain force corresponding to the frequency difference of the brillouin scattering light, and it is only necessary to perform corresponding calculation with respect to the number of windings or the winding density of the optical fiber 130 wound around the shaft body 120 in the torque sensor 100. Therefore, the conversion unit 150 described herein does not depend on a computer program or method, but on the structural combination of the entire torque sensor 100.
For example, the amount of stress and the monitored brillouin scattering have a linear relationship, and the specific calculation is as follows:
to embody the nature of the optical and mechanical coupling, we derive a new form of scattering equations from the elastic mechanics equations and maxwell equations. In the derivation process, the medium is assumed to be an isotropic linear elastomer, the optical field is approximated by a plane wave, and the pump light and the scattered light are linearly polarized and have the same polarization direction. The elastic mechanics control equation system is as follows:
equilibrium equation (dynamic):
geometric equation (linear):
constitutive equation (isotropic): sigmaij＝λkk ij+2Gij (4)
Wherein, lambda and G are Lame coefficients; f. ofiIs an electrostrictive force which is proportional to the gradient of the square of the electric field applied to the medium; - γ (E2) i/2, γ being the electrostrictive coefficient; u represents the displacement component of the particle, ui, j is 5ui/5xj,xj is a coordinate component.
The equations (2) to (4) form a basic equation set of the elastic mechanics theory, a displacement method can be adopted during solving, namely, a displacement component is selected as a basic unknown quantity and is used for representing stress and strain, then the basic unknown quantity is substituted into a balance equation, and a motion equation of a displacement form can be obtained after arrangement:
the elastic waves generated in the SBS process are all high-frequency oscillation ultrasonic waves, the frequency is generally 1010-1011 Hz, the elastic waves have extremely strong attenuation in a medium, and an attenuation term can be introduced into a formula (5) to express the process in a univocal manner, so that the process comprises the following steps:
in the formula, eta is a viscosity coefficient.
The propagation of light waves as electromagnetic waves in a medium complies with a common Maxwell equation system, only the condition of no charge and no current is considered, and a scalar wave equation can be obtained through certain vector operation and simplification:
wherein Ei is the electric field component; and μ 0 is the dielectric constant and the vacuum permeability, respectively; nonlinear electric polarization intensity PNL
i ═ Δ) Ei, Δ is the amount of fluctuation in dielectric constant due to various nonlinear effects, including nonlinear optical effects and thermodynamic effects. The nonlinear electric polarization intensity caused by the electrostrictive effect is as follows:
thus, in the presence of the electrostrictive effect, the propagation equation for the laser field can be written as:
combining the equations (6) and (9) to obtain the SBS equation set of the optomechanical coupling type:
as can be seen from equation (10), the optical response and the mechanical response are coupled together by the electrostrictive effect. The system of equations is closed, and each displacement component, namely the stress required by the application, can be completely solved theoretically by combining certain boundary conditions.
In an embodiment of the present application, the information representing the correspondence between the different characteristic values and the torque value includes: the peak value of brillouin scattered light and the frequency difference between brillouin scattered light in a zero-torque environment are characteristic value information at the time of shipment. By setting the characteristic value information when leaving the factory, the corresponding torsion value can be found from the corresponding relation information of different characteristic value information and the torsion value more quickly and accurately.
In an embodiment of the present invention, at least some of the incident end, the emergent end, the first signal converter 141, the second signal converter 142, and the scaling unit are disposed in the housing 110. As shown in fig. 2B, a schematic structural diagram is shown in which the incident end, the emergent end, the first signal converter 141, the second signal converter 142, and the scaling unit are all disposed in the housing 110, and accordingly, they may be disposed on the terminals of the system formed by the corresponding power device 300 and the load device 400;
alternatively, the incident end, the exit end, the first signal converter 141, the second signal converter 142, and the scaling unit are at least partially disposed outside the housing 110. As shown in fig. 2A, the incident end, the emergent end, the first signal converter 141, the second signal converter 142, and the scaling unit are all disposed outside the housing 110.
In an embodiment of the present application, the incident ends and the exit ends are multiple groups for emitting pulsed light with different frequencies.
As shown in fig. 4, the incident ends and the emergent ends of the light beams are divided into a plurality of groups, and each group of incident ends and emergent ends can generate pulsed light with different frequencies. Therefore, the torsion value obtained through conversion is more accurate through the characteristic value information under the pulse light of more frequencies.
In an embodiment of the present application, the torque sensor 100 further includes: and a communication unit 160 for communicating the extracted torque force value to the instrumentation or external device. The acquired torque value is transmitted to an external instrument for display through the wired or wireless communication unit 160, or transmitted to an external device such as an external mobile terminal or a server for display or reading.
In an embodiment of the present application, the torque sensor 100 further includes: and a stable power supply unit for supplying power to the optical fiber 130, the first signal converter 141, the second signal converter 142, and the scaling unit.
To sum up, the present application provides a torsion sensor based on optic fibre light scattering response, torsion sensor includes: a housing; the shaft body is fixedly connected between the movable end bodies at the two ends of the shell; the movable end bodies at the two ends are respectively used for fixedly connecting a measured rotating shaft so as to drive the end body at the corresponding end to rotate when the measured rotating shaft at least one end rotates, so that the torsion is transmitted to the shaft body; optical fibers are wound on the shaft body regularly; one end of the optical fiber is an incident end, and the other end of the optical fiber is an emergent end; the incident end is connected with a first signal converter for converting an optical signal of the incident end into a first digital signal, wherein the optical signal is reflected back to the incident end by the pulse light emitted by the incident end due to light scattering; the exit end is connected with a second signal converter for converting the pulse light emitted by the incident end into a second digital signal through the optical signal emitted by the exit end; the conversion unit is used for obtaining characteristic value information based on the Brillouin scattering effect according to the first digital signal and the second digital signal, and extracting a corresponding torsion value from corresponding relation information which is stored in the conversion unit and represents different characteristic value information and the torsion value.
The application effectively overcomes various defects in the prior art and has high industrial utilization value.
The above embodiments are merely illustrative of the principles and utilities of the present application and are not intended to limit the invention. Any person skilled in the art can modify or change the above-described embodiments without departing from the spirit and scope of the present application. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present application.
Claims (10)
1. A torsion sensor based on fiber optic light scattering sensing, the torsion sensor comprising:
a housing;
the shaft body is fixedly connected between the movable end bodies at the two ends of the shell; the movable end bodies at the two ends are respectively used for fixedly connecting a measured rotating shaft so as to drive the end body at the corresponding end to rotate when the measured rotating shaft at least one end rotates, so that the torsion is transmitted to the shaft body;
optical fibers are wound on the shaft body regularly; one end of the optical fiber is an incident end, and the other end of the optical fiber is an emergent end;
the incident end is connected with a first signal converter for converting an optical signal of the incident end into a first digital signal, wherein the optical signal is reflected back to the incident end by the pulse light emitted by the incident end due to light scattering; the exit end is connected with a second signal converter for converting the pulse light emitted by the incident end into a second digital signal through the optical signal emitted by the exit end;
the conversion unit is used for obtaining characteristic value information based on the Brillouin scattering effect according to the first digital signal and the second digital signal, and extracting a corresponding torsion value from corresponding relation information which is stored in the conversion unit and represents different characteristic value information and the torsion value.
2. The torsion sensor according to claim 1, wherein when the shaft body deforms due to torsion, the optical fiber wound around the shaft body can be driven to stretch or displace to some extent, so that characteristic value information based on a brillouin scattering effect in an optical signal generated by the optical fiber changes.
3. The torque sensor according to claim 2, wherein the characteristic value information based on the brillouin scattering effect includes: the peak value of the brillouin scattering light and the frequency difference of the brillouin scattering light.
4. The torque sensor according to claim 3, wherein the information indicating the correspondence between the different characteristic values and the torque values is obtained by calculating strain forces corresponding to different peak values of the Brillouin scattering light and frequency differences between the Brillouin scattering light under a plurality of different torque environments, and converting the strain forces into corresponding torque values, thereby obtaining a table of correspondence between the different peak values of the Brillouin scattering light and the frequency differences between the Brillouin scattering light and the actual torque values.
5. The torque sensor according to claim 4, wherein the peak Brillouin scattering light and the frequency difference between the Brillouin scattering light and the actual torque value have a linear relationship.
6. The torque sensor according to claim 4, wherein the information indicating the correspondence relationship between the different characteristic values and the torque values includes: the peak value of brillouin scattered light and the frequency difference between brillouin scattered light in a zero-torque environment are characteristic value information at the time of shipment.
7. The torque sensor according to claim 1, wherein at least a portion of the incident end, the exit end, the first signal converter, the second signal converter, and the scaling unit are disposed in the housing; or the incident end, the emergent end, the first signal converter, the second signal converter and the conversion unit are at least partially arranged outside the shell.
8. The torque sensor according to claim 1, wherein the incident end and the exit end are multiple groups for emitting pulsed light with different frequencies.
9. The torque sensor according to claim 1, further comprising: and the communication unit is used for communicating and transmitting the extracted torque force value to the instrument equipment or external equipment.
10. The torque sensor according to claim 1, further comprising: and the stable power supply unit is used for supplying power to the optical fiber, the first signal converter, the second signal converter and the conversion unit.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113340779A (en) * | 2021-06-03 | 2021-09-03 | 中国人民解放军陆军防化学院 | Explosion simulation experiment substance diffusion calculation method and device and storage medium |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113340779A (en) * | 2021-06-03 | 2021-09-03 | 中国人民解放军陆军防化学院 | Explosion simulation experiment substance diffusion calculation method and device and storage medium |
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