CN116990546A - A dual-fiber Bragg grating acceleration sensor based on arc cycloidal hinge and its calibration method - Google Patents
A dual-fiber Bragg grating acceleration sensor based on arc cycloidal hinge and its calibration method Download PDFInfo
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- CN116990546A CN116990546A CN202310755064.1A CN202310755064A CN116990546A CN 116990546 A CN116990546 A CN 116990546A CN 202310755064 A CN202310755064 A CN 202310755064A CN 116990546 A CN116990546 A CN 116990546A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P15/00—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration
- G01P15/02—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses
- G01P15/08—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values
- G01P15/093—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values by photoelectric pick-up
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P21/00—Testing or calibrating of apparatus or devices covered by the preceding groups
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Abstract
The application provides a dual-fiber Bragg grating acceleration sensor based on an arc cycloid hinge structure and a calibration method thereof, comprising the following steps: the sensor comprises a sensor fixing base, an arc cycloid mixing hinge, a rectangular elliptic mixing mass block and a fiber bragg grating; the arc end of the arc cycloid mixed hinge is connected with the sensor fixing base, and the cycloid end of the arc cycloid mixed hinge is connected with the mass block; the upper surface and the lower surface of the rectangular part of the mass block are on the same plane, and fiber Bragg gratings are respectively adhered right above and right below the hybrid hinge between the rectangular part of the mass block and the sensor fixing base on the same plane; two fiber Bragg gratings are etched on the same optical fiber and are stuck right above and right below the sensor by bypassing the elliptical part of the mass block. According to the method, the two optical fiber Bragg gratings are etched on the same optical fiber to bypass the elliptical mass block for pasting, and the signals of the two optical fiber Bragg gratings are collected through one signal output port, so that the sensitivity of the sensor is improved on the premise of improving the data collection capacity, and the influence of temperature is eliminated.
Description
Technical Field
The application belongs to the technical field of fiber Bragg grating sensors, and particularly relates to a dual-fiber Bragg grating acceleration sensor based on an arc cycloid hinge and a calibration method thereof.
Background
The statements in this section merely relate to the background of the present disclosure and may not necessarily constitute prior art.
In recent years, the acceleration sensor is installed on a plurality of large bridges at home and abroad and is applied to monitoring the health condition of the bridges, and the performance of the acceleration sensor has great influence on the real-time monitoring of the health condition of the bridges. For monitoring vibration conditions of bridges and buildings, a low-frequency acceleration sensor with high sensitivity and stability and reliability is required, and compared with a traditional piezoelectric sensor, the fiber bragg grating (Fiber Bragg Grating, FBG) acceleration sensor has the advantages of high sensitivity, strong electromagnetic interference resistance and the like, and can be used for real-time monitoring of bridges and buildings. And bridge monitoring needs to be carried out simultaneously at multiple points, and wiring problems of the piezoelectric acceleration sensor can be avoided by using the distributed sensing of the FBG acceleration sensor.
The fiber grating acceleration sensor is mainly divided into a fiber grating acceleration sensor based on a beam structure and other elastic structure forms. Because the fiber grating acceleration sensor of the hinge structure has the advantage of a beam structure, the integral vibration structure is integrally formed, the resonant frequency is higher than that of the traditional FBG acceleration sensor of the beam structure, and the structure of the acceleration sensor can be changed to meet the requirements of specific sensitivity and frequency measurement range with more practical requirements, so that the fiber grating acceleration sensor becomes a hot spot for research of the fiber grating acceleration sensor at home and abroad. Su Li and the like develop a wide-range high-sensitivity fiber bragg grating low-frequency vibration sensor, wherein the natural frequency of the sensor is about 91Hz, and the sensitivity is about 1.94nm/g. Zhong A hinge type acceleration sensor based on a double elastic plate is developed, the sensor uses the double elastic plate, the resonance frequency of the sensor is about 1300Hz, and the sensitivity is about 20pm/g.
However, the sensor has the defect that the hinge structure cannot be adjusted due to fixation, and is difficult to cope with the requirements of acceleration sensors in different bridge environments. The straight cycloid hinge is a special-shaped asymmetric flexible hinge structure based on cycloid and arc mixed notch, has the mechanical characteristic of adjustable rotation center, and can adjust the hinge structure to change the performance of a sensor so as to meet the monitoring requirement of a bridge.
Disclosure of Invention
In order to overcome the defects of the prior art, the application aims to provide the dual-fiber Bragg grating acceleration sensor based on the circular arc cycloid hinge and the calibration method thereof, and the sensitivity of the sensor is improved on the basis of meeting the requirement of the resonance frequency on a bridge by utilizing the advantages of the circular arc cycloid hinge structure.
To achieve the above object, one or more embodiments of the present disclosure provide the following technical solutions:
in a first aspect, a dual fiber bragg grating acceleration sensor based on a circular arc cycloid hinge structure is disclosed, comprising: the sensor comprises a sensor fixing base, an arc cycloid mixing hinge, a rectangular elliptic mixing mass block and a fiber bragg grating;
the arc end of the arc cycloid mixed hinge is connected with the sensor fixing base, and the cycloid end of the arc cycloid mixed hinge is connected with the mass block;
the upper surface and the lower surface of the rectangular part of the mass block are on the same plane, and fiber Bragg gratings are respectively adhered right above and right below the hybrid hinge between the rectangular part of the mass block and the sensor fixing base on the same plane;
the double-fiber Bragg grating acceleration sensor based on the arc cycloid hinge structure uses two fiber Bragg gratings to be etched on the same optical fiber, and the optical fiber is adhered to the right upper part and the right lower part of the sensor by bypassing the elliptical part of the mass block.
In a second aspect, a performance analysis method of a dual-fiber bragg grating acceleration sensor based on an arc cycloid hinge structure is disclosed, including:
the sensitivity of the sensor is obtained by combining the optical fiber elastic coefficient and the hinge rotation stiffness according to a moment balance equation, and the resonance frequency of the sensor is obtained according to a mechanical model and a dynamics equation;
mathematical modeling is carried out on the sensor by using MATLAB, and the influence of the structural parameters of the sensor on sensitivity and resonance frequency is analyzed;
modeling the sensor using SolidWorks;
performing finite element simulation on the sensor model by using ANSYS;
performing modal frequency analysis on the sensor model by using a modal analysis module;
using a static stress analysis module to perform deformation analysis and stress analysis on the sensor model;
resonant frequency analysis is performed on the sensor model using the harmonic response module.
In a third aspect, a calibration system of a dual fiber bragg grating acceleration sensor based on an arc cycloid hinge structure is disclosed, comprising: the device comprises a laser light source, a signal generator, a signal amplifier, fiber bragg grating demodulation equipment, a computer, an excitation table and a dual-fiber bragg grating acceleration sensor based on an arc cycloid hinge structure;
the double-fiber Bragg grating acceleration sensor based on the arc cycloid hinge structure is fixed on the excitation table by using a nut and a bracket;
in a fourth aspect, a calibration method of a dual-fiber bragg grating acceleration sensor based on an arc cycloid hinge structure is disclosed, comprising the following steps:
performing frequency response calibration on a dual-fiber Bragg grating acceleration sensor based on an arc cycloid hinge structure;
calibrating sensitivity of the dual-fiber Bragg grating acceleration sensor based on the arc cycloid hinge structure;
and calibrating the transverse anti-interference capacity of the dual-fiber Bragg grating acceleration sensor based on the arc cycloid hinge structure.
Only if the frequency response, the sensitivity and the transverse anti-interference capability of the double-fiber Bragg grating acceleration sensor based on the arc cycloid hinge structure meet the requirements of acceleration sensing on a bridge, the qualified performance of the sensor can be confirmed.
Compared with the prior art, the beneficial effects of the present disclosure are:
according to the sensor and the method, the two optical fiber Bragg gratings are etched on the same optical fiber to bypass the elliptical mass block for pasting, signals of the two optical fiber Bragg gratings are collected through the signal output port, the sensitivity of the sensor is improved on the premise that the data collection capacity is improved, and the influence of temperature is eliminated.
The sensor and the method disclosed by the disclosure have the advantage that the center of the used arc cycloid hinge structure is adjustable, so that the parameters of the sensor can be adjusted according to the on-site monitoring requirement of a bridge.
The sensor and the method disclosed by the disclosure have good sensitivity linearity, and the dual-fiber Bragg grating can improve the sensitivity of the sensor and has good lateral anti-interference capability, and additional advantages are partially given in the following description.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure, illustrate and explain the exemplary embodiments of the disclosure and together with the description serve to explain the disclosure, and do not constitute an undue limitation on the disclosure.
FIG. 1 is a schematic diagram of a sensor structure of an embodiment of the present disclosure;
FIG. 2 is a schematic diagram of a sensor vibration model of an embodiment of the present disclosure;
FIG. 3 is the effect of sensor mass semi-elliptical minor axis length and height on sensor sensitivity and resonant frequency of an embodiment of the present disclosure;
FIG. 4 is an effect of sensor straight cycloid hinge parameters on sensor sensitivity and resonant frequency of an embodiment of the present disclosure;
FIG. 5 is a modal analysis diagram of a simulation example;
FIG. 6 is a deformation analysis diagram of a simulation example;
FIG. 7 is a graph of static stress analysis of a simulation example;
FIG. 8 is a graph of a harmonic response analysis of a simulation example;
FIG. 9 is a schematic diagram of a calibration system for an example sensor;
FIG. 10 is a time domain plot of an example sensor;
FIG. 11 is a graph of the frequency response of an example sensor;
FIG. 12 is a sensitivity plot of an example sensor;
fig. 13 is a graph of a lateral disturbance rejection analysis of an example sensor.
Detailed Description
The application is further described below with reference to the drawings.
It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the present disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments in accordance with the present disclosure. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
Embodiments of the present disclosure and features of embodiments may be combined with each other without conflict.
The embodiment discloses a double-fiber Bragg grating acceleration sensor based on an arc cycloid hinge structure, wherein the relation between each parameter of the sensor and the sensitivity and resonance frequency is obtained according to mathematical calculation and program simulation, and the sensor structure is optimized according to bridge field measurement requirements. And performing simulation on the optimized sensor structure by using ANSYS. And manufacturing a sensor object, calibrating the sensor and analyzing the result.
Specifically, this embodiment discloses a dual fiber bragg grating acceleration sensor based on a circular arc cycloid hinge structure, which is shown in fig. 1, and includes: the sensor comprises a sensor fixing base, an arc cycloid mixing hinge, a rectangular elliptic mixing mass block and a fiber bragg grating.
Wherein, one end of the arc cycloid mixed hinge is connected with the sensor fixing base, and the other end is connected with the mass block;
the upper surface and the lower surface of the rectangular part of the mass block are on the same plane, and fiber Bragg gratings are respectively stuck right above and right below the hybrid hinge between the rectangular part of the mass block and the sensor fixing base on the same plane;
two fiber Bragg gratings are etched on the same optical fiber and are stuck right above and right below the sensor by bypassing the elliptical part of the mass block.
The sensor mechanics model is shown in figure 2. The acceleration a acts on the mass to cause it to vibrate slightly about the straight cycloid hinge.
From the moment balance equation
Wherein m is the mass of the sensor mass block, d is the distance from the mass center of the mass block to the center of the hinge, K is the elastic coefficient of the optical fiber, deltal is the telescopic length of the optical fiber, h is the height of the mass block, K is the rotational rigidity of the straight cycloid hinge, and theta is the rotational angle of the mass block.
Wherein f=f 1 +f 2
Wherein E is the elastic modulus of the material, ω is the thickness of the sensor, the radius of the straight circle R=pi.c, t is the thickness of the thinnest part of the hinge,
sensor sensitivity analysis:
the sensitivity S of the sensor is determined by the ratio of the change delta l of the center wavelength of the fiber bragg grating to the acceleration a received by the sensor, namely
Where lambda is the center wavelength of the fiber grating, P e The effective elastic coefficient of the fiber grating.
Sensor resonant frequency analysis:
the resonant frequency is another important parameter of the acceleration sensor, and the sensor design needs to meet the resonant frequency requirement in practical application.
Obtaining the moment of inertia of the mass block according to the parallel axis theorem
Wherein m is the whole mass of the mass block, m 1 Is rectangular part mass, m 2 Is of semi-elliptical partial mass, long axisShort axis a=e 2 ，
Obtaining sensor resonant frequency from dynamics equation
Influence of structural parameters on sensor performance:
the flexible hinge parameter c, the thickness t at the thinnest part of the hinge, the height h of the mass block and the semi-elliptical short axis length e of the mass block can be obtained by a formula 2 The sensitivity of the sensor and the resonant frequency are greatly affected. Experiments were performed using MATLAB to model sensor sensitivity and resonant frequency. Since the sensor is used for detecting acceleration on a bridge, stainless steel is selected as a manufacturing material of the sensor, the elastic modulus of the material is 200GPa, and the density is 7850kg/m 3 Spring light coefficient P of optical fiber e The central wavelength lambda of the fiber bragg grating is 1532.5nm, the reflectivity is 90%, and the side mode suppression ratio is 11dB. Distance l=2pi.c between optical fiber fixing points, sensor thicknessOmega is 16mm, cross-sectional area A of optical fiber f Is 1.23 multiplied by 10 -8 m 2 Modulus of elasticity E of optical fiber f 72GPa.
Discussion of Mass height h and Mass semi-elliptical short axis Length e 2 The influence on the sensitivity and the resonant frequency of the sensor is that the flexible hinge parameter c=1.9080 mm,20 mm-h-40 mm and 5 mm-e 2 The thickness of the hinge is less than or equal to 10mm, the thickness of the hinge is 1.5mm,2mm and 2.5mm respectively, and the simulation result is shown in figure 3.
As can be seen from FIG. 3, the height of the mass and the length of the minor axis of the semi-ellipse have a large effect on the resonant frequency and sensitivity of the sensor for different hinge thicknesses, when h and e 2 The larger the mass, the greater the sensor sensitivity and the smaller the resonant frequency. As the hinge thickness t becomes larger, the resonant frequency becomes larger and the sensor sensitivity becomes smaller.
The effect of the straight cycloid flexible hinge parameters c and t on the sensor sensitivity and the resonant frequency is discussed. The flexible hinge parameter is 1mm or more and c or less than or equal to 3mm, the hinge thickness t is 1.5mm,2mm and 2.5mm respectively, the mass block height h=30 mm, and the semi-elliptical short axis length e of the mass block 2 =7mm, the simulation results are shown in fig. 4.
As can be seen from fig. 4, when the distance between the optical fiber attachment points, i.e., i=2ρc, is increased in the range of 1mm to 3mm, the sensor sensitivity and the resonance frequency are both decreased. The greater the hinge thickness t, the less sensitive the sensor, and the higher the resonant frequency.
According to fig. 3 and fig. 4, it can be known that changing the sensor parameters c, t, e2 and h has a certain influence on the sensor sensitivity and the resonance frequency, and the sensor resonance frequency is required to be greater than 500Hz and the sensitivity is not less than 50pm/g according to the requirement of in-situ calibration of the acceleration sensor on the actual bridge. Meanwhile, considering the length limitation of the fiber bragg grating, the processing difficulty of a real object and the requirements of the actual sensor on quality and size, the sensor parameters are finally selected from c=1.9098 mm, t=1.4mm, e2=6mm and h=24mm. And calculating according to the parameters to obtain the theoretical sensitivity 42pm/g of the sensor and the theoretical resonance frequency 471Hz.
ANSYS structure simulation:
sensor model fabrication is carried out by using SolidWorks, the sensor model is imported into ANSYS, and a first-order modal analysis result is shown in figure 5 after each parameter is set. And the front 4-order modal frequency of the sensor model is 471.06Hz, 2878.1Hz, 3226.7Hz and 9208.4Hz, the difference between the second-order modal frequency and the first-order modal frequency is large, and the transverse anti-interference capability of the sensor model is high.
Deformation analysis was performed using ANSYS, and a gravitational acceleration was applied to the sensor structure, and the simulation result was shown in fig. 6, resulting in a strain of 1.4 μm generated by the sensor under the gravitational acceleration.
Static stress analysis was performed using ANSYS, and a gravitational acceleration was applied to the sensor structure, with the simulation shown in fig. 7. The maximum stress position of the sensor elastomer is at the center of the hinge and is about 1.821MPa, the stress of other structures of the sensor is smaller, and the minimum stress value is about 5.82Pa.
Harmonic response analysis is carried out by using ANSYS, acceleration with the size of 4g is applied to the sensor structure, the analysis result is shown in figure 8, and the resonant frequency of the acceleration sensor model is 474Hz.
And (3) sensor experiment calibration:
an example calibration system for a sensor is schematically illustrated in FIG. 9. The sensor calibration system comprises: the device comprises a laser light source, a signal generator, a signal amplifier, fiber bragg grating demodulation equipment, a computer, an excitation table and a dual-fiber bragg grating acceleration sensor based on an arc cycloid hinge structure.
The sensor is arranged on a vibrating table by using a specific bracket, the vibrating table is set with certain vibration frequency and acceleration, a fiber bragg grating dynamic demodulator is used for signal acquisition and real-time recording on a computer, data are stored, and the sensor sensitivity and resonance frequency parameters are obtained by analysis.
Sensor time domain curve analysis: the calibration system sets the vibration frequency to 30Hz, the signal generator sets the signal voltage to 0.4v, and the time domain curve of the response of the FBG acceleration sensor is shown in figure 10. As can be seen from fig. 10, when the sensor receives external vibration, the wavelength drift amounts generated by two FBGs on the same optical fiber when the sensor vibrates are the same, and the directions are opposite.
Sensor frequency response analysis: the frequency response is an important parameter for determining the working range of the sensor, the signal generator sets the signal voltage to 1v, and the vibration test is performed from 10Hz to 650Hz, and the wavelength change is recorded, and the result is shown in figure 11. The test result shows that the wavelength variation of the sensor is largest near 460Hz in vibration frequency and is stable at 10-250 Hz.
Sensor sensitivity analysis: the sensitivity is an important parameter for determining the measuring precision of the sensor, the vibration table is provided with a constant frequency of 30Hz as the test frequency of the simulated bridge site, and the voltage value is increased to 0.9V from 0.2V in 30Hz test, and the step length is 0.1V. The change of the wavelength variation along with the acceleration value is recorded, the sensitivity of the fiber bragg grating acceleration sensor is calculated, and a sensitivity curve is drawn as shown in figure 12. Test results show that the sensitivity of the sensor double FBGs is 43.14pm/g at the frequency of 30Hz, and the fitting coefficient is 0.9957; the sensitivity of the single FBG1 of the sensor is 21.74pm/g, the fitting coefficient is 0.9977, and the wavelength change and the acceleration change of the sensor have good linear relation.
And (3) analyzing the transverse anti-interference capability of the sensor: lateral immunity is an important parameter of whether a sensor pair can accommodate a complex environment. The vibration table is set to have a vibration frequency of 50Hz, and the input voltage of the signal generator is 0.3V. The test direction of the acceleration sensor is perpendicular to the vibration direction of the hinge, and the test result is shown in fig. 13. The test result shows that when the sensor performs vibration sensing perpendicular to the vibration direction of the hinge, the sensitivity of the sensor is 2.456pm/g, which is far smaller than the sensitivity of the vibration direction of the hinge, and the obtained sensor has a lateral interference degree of about 5.7%, namely the acceleration sensor has better lateral anti-interference capability.
The embodiment of the disclosure provides a double-fiber Bragg grating acceleration sensor based on an arc cycloid hinge structure, and the sensor calibration experiment is used for verifying and analyzing an optimized simulation result. The calibration result shows that the sensitivity is about 43.14pm/g, the wavelength variation of the sensor is maximum near 460Hz at the vibration frequency, the wavelength variation is stable between 10 and 250Hz, and the transverse interference of the sensor is about 5.7%. In addition, experiments further prove that the double-grating etching can simultaneously perform wavelength acquisition processing on the same optical fiber, and a new choice is provided for monitoring the vibration acceleration distributed sensing of the bridge structure.
The foregoing description of the preferred embodiments of the present disclosure is provided only and is not intended to limit the disclosure so that various modifications and changes may be made to the present disclosure by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present disclosure should be included in the protection scope of the present disclosure.
Claims (14)
1. A dual-fiber Bragg grating acceleration sensor based on an arc cycloid hinge structure is characterized by comprising: the sensor comprises a sensor fixing base, an arc cycloid mixing hinge, a rectangular elliptic mixing mass block and a fiber bragg grating;
the arc end of the arc cycloid mixed hinge is connected with the sensor fixing base, and the cycloid end of the arc cycloid mixed hinge is connected with the mass block;
the upper surface and the lower surface of the rectangular part of the mass block and the rectangular part of the sensor fixing base are on the same plane, and fiber Bragg gratings are respectively stuck right above and right below the hybrid hinge between the rectangular part of the mass block and the sensor fixing base on the same plane.
2. The dual-fiber bragg grating acceleration sensor based on the circular arc cycloid hinge structure according to claim 1, wherein two fiber bragg gratings are etched on the same optical fiber and adhered right above and right below the sensor by bypassing the elliptical part of the mass block.
3. The dual fiber bragg grating acceleration sensor based on the circular arc cycloid hinge structure according to claim 1, wherein the fiber bragg gratings are pre-stressed when being pasted, so that the chirp phenomenon is prevented.
4. The dual-fiber Bragg grating acceleration sensor based on the circular arc cycloid hinge structure according to claim 1, wherein the sensor fixing base, the circular arc cycloid mixing hinge and the rectangular elliptic mixing mass block are integrally manufactured by stainless steel.
5. The dual-fiber bragg grating acceleration sensor based on the circular arc cycloid hinge structure according to claim 1, wherein the center of the circular arc cycloid hybrid hinge structure is adjustable.
6. The dual-fiber Bragg grating acceleration sensor based on the arc cycloid hinge structure is characterized in that the sensitivity and resonance frequency required for bridge monitoring are set as target parameters, and the composite hinge parameters, the height of the rectangular mass block and the short axis length of the elliptical mass block are taken as constraint conditions, so that the sensor structural parameters meeting the bridge monitoring requirements are obtained.
7. The dual-fiber Bragg grating acceleration sensor based on the arc cycloid hinge structure is characterized in that when the sensor works, one fiber Bragg grating stretches and the other fiber Bragg grating contracts at the same moment, and the central wavelength changes of the two fiber Bragg gratings are equal in size and opposite in direction.
8. The method for optimizing parameters of the dual-fiber Bragg grating acceleration sensor based on the arc cycloid hinge structure, which is disclosed in claim 6, is characterized in that the sensitivity of the sensor is obtained by combining the optical fiber elasticity coefficient and the hinge rotation stiffness according to a moment balance equation, and the resonance frequency of the sensor is obtained according to a mechanical model and a dynamics equation.
9. The method for optimizing parameters of the dual-fiber Bragg grating acceleration sensor based on the circular arc cycloid hinge structure, which is disclosed by claim 6, is characterized in that MATLAB is used for carrying out mathematical modeling on the sensor, and the influence of the structural parameters of the sensor on sensitivity and resonance frequency is analyzed.
10. The method for analyzing the performance of the dual-fiber bragg grating acceleration sensor based on the circular arc cycloid hinge structure according to claim 8, comprising the steps of:
modeling the sensor using SolidWorks;
performing finite element simulation on the sensor model by using ANSYS;
performing modal frequency analysis on the sensor model by using a modal analysis module;
using a static stress analysis module to perform deformation analysis and stress analysis on the sensor model;
resonant frequency analysis is performed on the sensor model using the harmonic response module.
11. The calibration method of the dual-fiber Bragg grating acceleration sensor based on the arc cycloid hinge structure is characterized in that the sensor is calibrated by using a comparison calibration method.
12. The calibration method of the dual-fiber bragg grating acceleration sensor based on the circular arc cycloid hinge structure according to claim 11, wherein the calibration system is used for calibrating the sensor, and the method comprises the following steps: the device comprises a laser light source, a signal generator, a signal amplifier, fiber bragg grating demodulation equipment, a computer, an excitation table and a dual-fiber bragg grating acceleration sensor based on an arc cycloid hinge structure;
the double-fiber Bragg grating acceleration sensor based on the arc cycloid hinge structure is fixed on the excitation table by using nuts and a bracket.
13. The calibration method of the dual-fiber Bragg grating acceleration sensor based on the arc cycloid hinge structure is characterized in that a signal generator generates a sine signal, the sine signal is amplified by a signal amplifier and is input into an excitation table to generate periodic vibration, the sensor receives an external vibration signal, the central wavelength of a fiber bragg grating is changed, and fiber bragg grating demodulation equipment demodulates wavelength information and outputs the wavelength information to a computer for collection.
14. The calibration method of the dual-fiber bragg grating acceleration sensor based on the circular arc cycloid hinge structure according to claim 11, comprising the following steps:
performing frequency response calibration on a dual-fiber Bragg grating acceleration sensor based on an arc cycloid hinge structure;
calibrating sensitivity of the dual-fiber Bragg grating acceleration sensor based on the arc cycloid hinge structure;
and calibrating the transverse anti-interference capacity of the dual-fiber Bragg grating acceleration sensor based on the arc cycloid hinge structure.
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