CN110160629B - Calibration method and device of optical fiber strain sensing system - Google Patents
Calibration method and device of optical fiber strain sensing system Download PDFInfo
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- CN110160629B CN110160629B CN201910561071.1A CN201910561071A CN110160629B CN 110160629 B CN110160629 B CN 110160629B CN 201910561071 A CN201910561071 A CN 201910561071A CN 110160629 B CN110160629 B CN 110160629B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H11/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties
- G01H11/06—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties by electric means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H9/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means
- G01H9/004—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means using fibre optic sensors
- G01H9/006—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means using fibre optic sensors the vibrations causing a variation in the relative position of the end of a fibre and another element
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Abstract
The invention provides a calibration method of an optical fiber strain sensing system, which comprises the following steps: suspending the heavy object platform on a stainless steel frame through a sensing optical fiber, and adjusting the height of the vibration table; placing an electronic detector on a vibration table; setting the vibration amplitude and frequency of the vibration table; obtaining a first displacement of the vibration table according to the vibration amplitude and the frequency, and measuring the speed of the vibration table through an electronic detector; converting the speed of the vibration table into a second displacement of the vibration table; and calculating the goodness of fit of the vibration table so as to finish the calibration of the optical fiber strain sensing system. The invention also provides a calibration device of the optical fiber strain sensing system. The invention enables the sensing optical fiber and the electronic detector to simultaneously measure the motion process of the vibration table, and fits the motion information respectively measured by the sensing optical fiber and the electronic detector, and the deformation quantity of the sensing optical fiber can be matched with the vibration amplitude of the vibration table, thereby improving the accuracy of the optical fiber strain sensing system and ensuring the rationality and feasibility of the calibration method.
Description
Technical Field
The invention belongs to the technical field of optical fiber sensing, and particularly relates to a calibration method and device of an optical fiber strain sensing system.
Background
With the increasing maturity of optical fiber strain sensing technology and the beginning of replacing electronic detectors in some application occasions, however, whether the strain magnitude measured by the optical fiber sensing system is consistent with the actual strain magnitude, the vibration frequency range and the vibration amplitude range which can be accurately measured are what, and these problems need to be solved through strict calibration. At present, an effective calibration scheme does not exist, so that the strain of the optical fiber can accurately reflect the motion of the vibrating table, and the electronic detector can correspond to the physical quantity measured by the optical fiber strain sensing system.
Disclosure of Invention
Aiming at the defects in the prior art, the calibration method and the calibration device for the optical fiber strain sensing system provided by the invention can accurately reflect the motion of the vibration table, and can effectively reflect the accuracy of the optical fiber strain sensing system by simultaneously measuring the displacement of the vibration table by using the electronic detector and the sensing optical fiber.
In order to achieve the above purpose, the invention adopts the technical scheme that:
the scheme provides a calibration method of an optical fiber strain sensing system, which comprises the following steps:
s1, hanging the heavy object platform on a stainless steel frame through a sensing optical fiber, and adjusting the height of the vibration table;
s2, placing an electronic detector on the vibration table;
s3, setting the vibration amplitude and frequency of the vibration table through a vibration table control unit;
s4, demodulating the optical signal of the sensing optical fiber through a demodulation unit according to the vibration amplitude and the frequency to obtain a first displacement of the vibration table, and measuring the speed of the vibration table through the electronic detector;
s5, converting the speed of the vibration table into a second displacement of the vibration table;
and S6, calculating the goodness of fit of the vibrating table according to the first displacement of the vibrating table and the second displacement of the vibrating table, and thus completing calibration of the optical fiber strain sensing system.
Further, in the step S1, adjusting the height of the vibration table specifically includes:
when the heavy object platform is hung by the sensing optical fiber, the bottom surface of the heavy object platform is kept horizontal to the vibration table, and the sensing optical fiber is kept in a tight and taut state.
Still further, the step S4 includes the following steps:
s401, controlling the vibration table to vibrate from small to large at a fixed frequency and different vibration amplitudes through a vibration table control unit, demodulating an optical signal of a sensing optical fiber at the fixed frequency through a demodulation unit to obtain first displacement of the vibration table, and measuring the speed of the vibration table at the fixed frequency through an electronic detector;
s402, changing the vibration frequency of the vibration table, repeating the step S401, demodulating optical signals of the sensing optical fiber under different frequencies through a demodulation unit to obtain first displacement of the vibration table, and measuring the speed of the vibration table under different frequencies through the electronic detector;
s403, controlling the vibration table to vibrate in a fixed vibration amplitude and different frequencies from small to large through the vibration table control unit, demodulating an optical signal of the sensing optical fiber under the fixed vibration amplitude through the demodulation unit to obtain a first displacement of the vibration table, and measuring the speed of the vibration table under the fixed vibration amplitude through the electronic detector;
s404, changing the vibration amplitude of the vibration table, repeating the step S403, demodulating the optical signal of the sensing optical fiber under the vibration of different amplitudes through a demodulation unit to obtain a first displacement of the vibration table, and measuring the speed of the vibration table under the vibration of different amplitudes through the electronic detector.
Still further, in step S5, the speed of the vibration table measured by the electronic detector is converted into a second displacement S of the vibration table, which is expressed as follows:
wherein, VppThe peak value of the vibration table speed signal measured by the electronic detector is shown, L represents the dynamic coefficient of the electronic detector, and T represents the vibration period of the vibration table.
Based on the method, the invention also discloses a calibration device of the optical fiber strain sensing system, which comprises an optical fiber strain sensing subsystem, a vibration generation subsystem connected with the optical fiber strain sensing subsystem, and an electronic detector positioned on the vibration generation subsystem, wherein,
the optical fiber strain sensing subsystem comprises a demodulation unit, a sensing optical fiber connected with the demodulation unit, a stainless steel frame and a weight platform, wherein the stainless steel frame and the weight platform are respectively connected with the sensing optical fiber;
the vibration generation subsystem comprises a vibration table and a vibration table control unit connected with the vibration table;
the electronic detector is positioned on the vibration table.
Further, the height of stainless steel frame is 2 meters at least, and it is fixed in on the ground.
Still further, the sensing fiber has a length of at least 20 meters and is wound at least 10 turns between the weight platform and the stainless steel frame.
Still further, the weight of the weight platform is greater than 4 kg.
Still further, the electronic detector is a PS-10R speed type electronic detector.
Furthermore, the demodulation unit is used for demodulating the optical signal in the sensing optical fiber to obtain the deformation quantity of the sensing optical fiber;
the sensing optical fiber is used for connecting the stainless steel frame and the weight platform, and the displacement of the vibration table is obtained through the deformation quantity of the sensing optical fiber;
the stainless steel frame is fixed on the ground and used for hanging a heavy object platform;
the weight platform is hung at the bottom of the sensing optical fiber, is positioned on the vibration table and is used for enabling the sensing optical fiber to deform through vibration of the vibration table;
the vibration table is used for placing a heavy object platform and an electronic detector, the heavy object platform drives the sensing optical fiber to deform through vibration of the vibration table, and meanwhile, the electronic detector measures the speed of the vibration table through vibration of the vibration table;
the vibration table control unit is used for controlling the vibration amplitude and the frequency of the vibration table;
and the electronic detector is used for converting the measured speed of the vibrating table into voltage to obtain the displacement of the vibrating table.
The invention has the beneficial effects that:
(1) the invention can accurately reflect the motion of the vibrating table by sensing the deformation quantity of the optical fiber and the displacement quantity of the vibrating table corresponding to the deformation quantity, and the electronic detector and the optical fiber strain sensing system are simultaneously measured, so that the accuracy of the optical fiber strain sensing system can be effectively reflected;
(2) according to the invention, the optical fiber strain obtained by the optical fiber strain sensing subsystem is quantitatively compared with the vibration signal detected by the electronic detector on the vibration table, so that the accuracy of the optical fiber strain sensing system is improved.
Drawings
FIG. 1 is a flow chart of the method of the present invention.
Fig. 2 is a schematic diagram of a control structure of the present invention.
Fig. 3 is a schematic diagram of a simple structure for calibrating the optical fiber strain sensing subsystem according to the present invention.
Fig. 4 is a schematic diagram of a specific structure of the fiber strain sensing subsystem calibration in the present invention.
FIG. 5 is a graph showing a 10Hz normalized display comparison of the time-domain waveforms of the fiber strain sensing subsystem and the electronic detector in this embodiment.
FIG. 6 is a 20Hz normalized display comparison graph of the time domain waveforms of the fiber strain sensing subsystem and the electronic detector in this embodiment.
FIG. 7 is a graph showing a comparison of the time domain waveforms of the optical fiber strain sensing subsystem and the electronic detector in this embodiment at 30 Hz.
FIG. 8 is a graph comparing the response of the fiber strain sensing subsystem and the electronic detector in this embodiment.
FIG. 9 is a schematic diagram of the driving amplitude response of the fiber strain sensing system vibrating at the frequency of 2Hz on the vibrating table in this embodiment.
FIG. 10 is a schematic diagram of the driving amplitude response of the fiber strain sensing system vibrating at the frequency of 5Hz on the vibrating table in this embodiment.
FIG. 11 is a schematic diagram of the driving amplitude response of the fiber strain sensing system vibrating at the frequency of 10Hz on the vibrating table in this embodiment.
FIG. 12 is a schematic diagram showing the driving amplitude response of the fiber strain sensing system vibrating at 20Hz on the vibrating table in this embodiment.
FIG. 13 is a schematic diagram of the driving amplitude response of the fiber strain sensing system vibrating at the frequency of 30Hz on the vibrating table in this embodiment.
FIG. 14 is a schematic diagram of the driving amplitude response of the fiber strain sensing system vibrating at the frequency of 50Hz on the vibrating table in this embodiment.
FIG. 15 is a diagram showing the driving amplitude response of the fiber strain sensing system vibrating at a frequency of 70Hz on the vibrating table in this embodiment.
FIG. 16 is a schematic diagram showing the driving amplitude response of the optical fiber strain sensing system vibrating at the frequency of 100Hz in the vibrating table in the embodiment.
Detailed Description
The following description of the embodiments of the present invention is provided to facilitate the understanding of the present invention by those skilled in the art, but it should be understood that the present invention is not limited to the scope of the embodiments, and it will be apparent to those skilled in the art that various changes may be made without departing from the spirit and scope of the invention as defined and defined in the appended claims, and all matters produced by the invention using the inventive concept are protected.
Examples
As shown in fig. 1, a calibration method of an optical fiber strain sensing system is implemented as follows:
s1, hanging a weight platform on a stainless steel frame through a sensing optical fiber, and adjusting the height of a vibration table, wherein the height of the stainless steel frame is at least 2 m and is fixed on the ground, the length of the sensing optical fiber is at least 20 m, the sensing optical fiber is wound between the weight platform and the stainless steel frame for at least 10 circles, the weight of the weight platform is more than 4kg, when the weight platform is hung by the sensing optical fiber, the bottom surface of the weight platform is kept horizontal with the vibration table, and the sensing optical fiber is kept in a tight state;
s2, placing an electronic detector on the vibration table, wherein the electronic detector is a PS-10R speed type electronic detector;
s3, setting the vibration amplitude and frequency of the vibration table through a vibration table control unit;
s4, according to the vibration amplitude and the frequency, demodulating the optical signal of the sensing optical fiber through a demodulation unit to obtain a first displacement of the vibration table, and simultaneously measuring the speed of the vibration table through the electronic detector, wherein the method comprises the following steps:
s401, controlling the vibration table to vibrate from small to large at a fixed frequency and different vibration amplitudes through a vibration table control unit, demodulating an optical signal of a sensing optical fiber at the fixed frequency through a demodulation unit to obtain first displacement of the vibration table, and measuring the speed of the vibration table at the fixed frequency through an electronic detector;
s402, changing the vibration frequency of the vibration table, repeating the step S401, demodulating optical signals of the sensing optical fiber under different frequencies through a demodulation unit to obtain first displacement of the vibration table, and measuring the speed of the vibration table under different frequencies through the electronic detector;
s403, controlling the vibration table to vibrate in a fixed vibration amplitude and different frequencies from small to large through the vibration table control unit, demodulating an optical signal of the sensing optical fiber under the fixed vibration amplitude through the demodulation unit to obtain a first displacement of the vibration table, and measuring the speed of the vibration table under the fixed vibration amplitude through the electronic detector;
s404, changing the vibration amplitude of the vibration table, repeating the step S403, demodulating the optical signals of the sensing optical fiber under the vibration of different amplitudes through a demodulation unit to obtain a first displacement of the vibration table, and measuring the speed of the vibration table under the vibration of different amplitudes through the electronic detector;
s5, converting the speed of the vibration table into a second displacement of the vibration table, wherein the expression of the second displacement S is as follows:
wherein, VppThe peak value of a speed signal of the vibration table measured by the electronic detector is represented, L represents a dynamic coefficient of the electronic detector, and T represents a vibration period of the vibration table;
and S6, calculating the goodness of fit of the vibrating table according to the first displacement of the vibrating table and the second displacement of the vibrating table, and thus completing calibration of the optical fiber strain sensing system.
As shown in fig. 2, based on the above method, the present invention further provides a calibration apparatus for an optical fiber strain sensing system, including an optical fiber strain sensing subsystem, a vibration generating subsystem connected to the optical fiber strain sensing subsystem, and an electronic detector located on the vibration generating subsystem, wherein,
the optical fiber strain sensing subsystem comprises a demodulation unit, a sensing optical fiber connected with the demodulation unit, a stainless steel frame and a weight platform, wherein the stainless steel frame and the weight platform are respectively connected with the sensing optical fiber;
the vibration generation subsystem comprises a vibration table and a vibration table control unit connected with the vibration table;
the electronic detector is positioned on the vibration table;
the demodulation unit is used for demodulating the optical signal in the sensing optical fiber to obtain the deformation quantity of the sensing optical fiber;
the sensing optical fiber is used for connecting the stainless steel frame and the weight platform, and the displacement of the vibration table is obtained through the deformation quantity of the sensing optical fiber;
the stainless steel frame is fixed on the ground and used for hanging a heavy object platform;
the weight platform is hung at the bottom of the sensing optical fiber, is positioned on the vibration table and is used for enabling the sensing optical fiber to deform through vibration of the vibration table;
the vibration table is used for placing a heavy object platform and an electronic detector, the heavy object platform drives the sensing optical fiber to deform through vibration of the vibration table, and meanwhile, the electronic detector measures the speed of the vibration table through vibration of the vibration table;
the vibration table control unit is used for controlling the vibration amplitude and the frequency of the vibration table;
and the electronic detector is used for converting the measured speed of the vibrating table into voltage to obtain the displacement of the vibrating table.
In a specific embodiment, as shown in fig. 3-4, the optical fiber strain sensing subsystem can demodulate the deformation occurring at a certain position on the sensing optical fiber, a heavy object platform is suspended on a stainless steel frame by the sensing optical fiber, the height of a vibration table for calibration is adjusted, the bottom surface of the heavy object platform is in contact with the vibration table, the optical fiber is kept tight, meanwhile, a standard electronic detector is placed on the vibration table, the vibration of the vibration table is detected simultaneously with the optical fiber strain sensing system, the heavy object platform is driven when the vibration table vibrates up and down, the optical fiber stretches and deforms along with the vibration table, the optical fiber strain obtained by the optical fiber strain sensing subsystem reflects the displacement of the vibration table, and the signal detected by the electronic detector on the vibration table is the speed of the vibration table, so that the speed measured by the electronic detector is converted into the displacement and then fitted with the displacement measured by the sensing optical fiber, thereby achieving the accuracy of the fiber sensing system.
To further illustrate this solution, the following data are listed:
a part of optical fibers of the sensing optical fibers are wound on the stainless steel and heavy object platform, the heavy object platform can generate corresponding vibration signals through vibration of the vibration table, the sensing optical fibers are deformed, displacement of the vibration table is obtained, meanwhile, the electronic detector converts the measured speed of the vibration table into voltage, and the displacement of the vibration table is obtained through the voltage. As shown in fig. 5, 6 and 7, the frequencies of the driving signals of the control unit of the vibration table are respectively set to 10Hz, 20Hz and 30Hz, the voltage of the driving signals at each frequency is set to 2 points within the range of 0.05V-400V, so that the vibration table simultaneously excites the optical fiber strain sensing subsystem and the electronic detector, the displacement amplitude waveform of the optical fiber strain sensing subsystem and the voltage value waveform of the electronic detector are measured, finally the waveform comparison of the data collected by the optical fiber strain sensing subsystem and the electronic detector under the same dimension is analyzed, and the coincidence degree of the two sets of waveforms is compared. As can be seen from fig. 5, 6 and 7, the waveform signals collected by the optical fiber strain sensing subsystem and the electronic detector are substantially identical.
For the frequency response test: a part of optical fibers of the sensing optical fibers are wound on the stainless steel and heavy object platform, the heavy object platform can generate corresponding vibration signals through vibration of the vibration table, the sensing optical fibers are deformed, displacement of the vibration table is obtained, meanwhile, the electronic detector converts the measured speed of the vibration table into voltage, and the displacement of the vibration table is obtained through the voltage. As shown in fig. 8, the voltage amplitude of the vibration signal driven by the vibration table control unit is set to be a fixed value, 6 frequency points are taken within the range of 1Hz-100Hz, signal excitation is simultaneously performed on the optical fiber strain sensing subsystem and the electronic detector, the displacement amplitude of the optical fiber strain sensing subsystem and the voltage value of the electronic detector are measured, finally, the linearity relation of data collected by the optical fiber strain sensing subsystem and the electronic detector under the same dimension is analyzed, and the frequency response curve of the optical fiber strain sensing subsystem under the same vibration amplitude is obtained. As can be seen from fig. 8, the frequency responses of the optical fiber strain sensing subsystem and the electronic detector are substantially the same.
Amplitude response test for different frequencies: a part of optical fibers of the sensing optical fibers are wound on the stainless steel and heavy object platform, the heavy object platform can generate corresponding vibration signals through vibration of the vibration table, the sensing optical fibers are deformed, displacement of the vibration table is obtained, meanwhile, the electronic detector converts the measured speed of the vibration table into voltage, and the displacement of the vibration table is obtained through the voltage. As shown in fig. 9, 10, 11, 12, 13, 14, 15 and 16, the frequencies of the driving signals of the vibration table control unit are respectively set to 2Hz, 5Hz, 10Hz, 20Hz, 30Hz, 50Hz, 70Hz and 100Hz, the voltages of the driving signals at each frequency are sequentially increased, the vibration table simultaneously excites the optical fiber strain sensing subsystem and the electronic detector, the displacement amplitude of the optical fiber strain sensing subsystem and the voltage value of the electronic detector are measured, and finally the linearity relation of the data collected by the optical fiber strain sensing subsystem and the electronic detector under the same dimension is analyzed, so that the amplitude response curve of the optical fiber strain sensing subsystem under each single frequency is obtained. As can be seen from fig. 9, 10, 11, 12, 13, 14, 15 and 16, the sensing fiber responds linearly in the range of 2-100Hz, and the goodness of fit R2 is greater than 0.99, which indicates that the amplitude response of the fiber strain sensing subsystem is linear and has good linearity.
The invention enables the sensing optical fiber and the electronic detector to simultaneously measure the motion of the vibration table through the design, and the optical fiber strain obtained through the optical fiber strain sensing subsystem is quantitatively compared with the vibration signal detected by the electronic detector on the vibration table, thereby improving the accuracy of the optical fiber sensing system. The method is simple to operate, and the deformation quantity of the optical fiber can be matched with the vibration amplitude of the vibration table, so that the reasonability and the feasibility of the calibration method are ensured.
Claims (8)
1. A calibration method of an optical fiber strain sensing system is characterized by comprising the following steps:
s1, hanging the heavy object platform on a stainless steel frame through a sensing optical fiber, and adjusting the height of the vibration table, wherein:
the height of adjustment shaking table, it specifically is:
when the heavy object platform is hung by the sensing optical fiber, the bottom surface of the heavy object platform is kept horizontal to the vibration table, and the sensing optical fiber is kept in a tight state;
s2, placing an electronic detector on the vibration table;
s3, setting the vibration amplitude and frequency of the vibration table through a vibration table control unit;
s4, demodulating the optical signal of the sensing optical fiber through a demodulation unit according to the vibration amplitude and the frequency to obtain a first displacement of the vibration table, and measuring the speed of the vibration table through the electronic detector;
s5, converting the speed of the vibration table into a second displacement of the vibration table;
and S6, calculating the goodness of fit of the vibrating table according to the first displacement of the vibrating table and the second displacement of the vibrating table, and thus completing calibration of the optical fiber strain sensing system.
2. The calibration method of the optical fiber strain sensing system according to claim 1, wherein the step S4 comprises the following steps:
s401, controlling the vibration table to vibrate from small to large at a fixed frequency and different vibration amplitudes through a vibration table control unit, demodulating an optical signal of a sensing optical fiber at the fixed frequency through a demodulation unit to obtain first displacement of the vibration table, and measuring the speed of the vibration table at the fixed frequency through an electronic detector;
s402, changing the vibration frequency of the vibration table, repeating the step S401, demodulating optical signals of the sensing optical fiber under different frequencies through a demodulation unit to obtain first displacement of the vibration table, and measuring the speed of the vibration table under different frequencies through the electronic detector;
s403, controlling the vibration table to vibrate in a fixed vibration amplitude and different frequencies from small to large through the vibration table control unit, demodulating an optical signal of the sensing optical fiber under the fixed vibration amplitude through the demodulation unit to obtain a first displacement of the vibration table, and measuring the speed of the vibration table under the fixed vibration amplitude through the electronic detector;
s404, changing the vibration amplitude of the vibration table, repeating the step S403, demodulating the optical signal of the sensing optical fiber under the vibration of different amplitudes through a demodulation unit to obtain a first displacement of the vibration table, and measuring the speed of the vibration table under the vibration of different amplitudes through the electronic detector.
3. The method for calibrating an optical fiber strain sensing system according to claim 1, wherein the step S5 is to convert the velocity of the vibrating table measured by the electronic detector into a second displacement S of the vibrating table, which is expressed as follows:
wherein, VppThe peak value of the vibration table speed signal measured by the electronic detector is shown, L represents the dynamic coefficient of the electronic detector, and T represents the vibration period of the vibration table.
4. A calibration device of an optical fiber strain sensing system is characterized by comprising an optical fiber strain sensing subsystem, a vibration generation subsystem connected with the optical fiber strain sensing subsystem, and an electronic detector positioned on the vibration generation subsystem, wherein,
the optical fiber strain sensing subsystem comprises a demodulation unit, a sensing optical fiber connected with the demodulation unit, a stainless steel frame and a weight platform, wherein the stainless steel frame and the weight platform are respectively connected with the sensing optical fiber;
the vibration generation subsystem comprises a vibration table and a vibration table control unit connected with the vibration table;
the electronic detector is positioned on the vibration table;
the demodulation unit is used for demodulating the optical signal in the sensing optical fiber to obtain the deformation quantity of the sensing optical fiber;
the sensing optical fiber is used for connecting the stainless steel frame and the weight platform, and the displacement of the vibration table is obtained through the deformation quantity of the sensing optical fiber;
the stainless steel frame is fixed on the ground and used for hanging a heavy object platform;
the weight platform is hung at the bottom of the sensing optical fiber, is positioned on the vibration table and is used for enabling the sensing optical fiber to deform through vibration of the vibration table;
the vibration table is used for placing a heavy object platform and an electronic detector, the heavy object platform drives the sensing optical fiber to deform through vibration of the vibration table, and meanwhile, the electronic detector measures the speed of the vibration table through vibration of the vibration table;
the vibration table control unit is used for controlling the vibration amplitude and the frequency of the vibration table;
and the electronic detector is used for converting the measured speed of the vibrating table into voltage to obtain the displacement of the vibrating table.
5. The calibration device of the optical fiber strain sensing system according to claim 4, wherein the stainless steel frame has a height of at least 2 m and is fixed on the ground.
6. Calibration arrangement for an optical fiber strain sensing system according to claim 4, wherein the sensing fiber has a length of at least 20 meters and is wound at least 10 turns between the weight platform and the stainless steel frame.
7. The calibration device of the optical fiber strain sensing system according to claim 4, wherein the weight of the weight platform is greater than 4 kg.
8. The apparatus for calibrating an optical fiber strain sensing system according to claim 4, wherein the electronic detector is a PS-10R velocity type electronic detector.
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| CN106124803A (en) * | 2016-06-13 | 2016-11-16 | 中国地质大学（武汉） | A kind of calibration system of optical fiber acceleration transducer |
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