CN109990818B - Fiber grating sensor calibration instrument - Google Patents
Fiber grating sensor calibration instrument Download PDFInfo
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- CN109990818B CN109990818B CN201811455550.7A CN201811455550A CN109990818B CN 109990818 B CN109990818 B CN 109990818B CN 201811455550 A CN201811455550 A CN 201811455550A CN 109990818 B CN109990818 B CN 109990818B
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- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D18/00—Testing or calibrating apparatus or arrangements provided for in groups G01D1/00 - G01D15/00
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Abstract
The invention relates to the technical field of fiber grating sensors, in particular to a fiber grating sensor calibrator. The device comprises a base, a calibration plate, a temperature calibration mechanism for heating the calibration plate, an angle calibration mechanism for enabling the optical fiber to generate bending deformation and a strain calibration mechanism for enabling the optical fiber to generate elastic deformation; the calibration plate, the temperature calibration mechanism, the angle calibration mechanism and the strain calibration mechanism are all arranged on the base; the base is provided with an optical fiber socket, the optical fiber to be detected is fixed on the calibration plate, the optical fiber to be detected is connected with the optical fiber socket, and the other end of the optical fiber socket is connected with the optical fiber demodulator. The fiber grating sensor calibrator provided by the invention can calibrate the temperature, the angle and the strain coefficient of an optical fiber at the same time, and is simple and convenient to operate; the accuracy of the optical fiber calibration coefficient is effectively improved, and the efficiency is also improved.
Description
Technical Field
The invention relates to the technical field of fiber grating sensors, in particular to a fiber grating sensor calibrator.
Background
The shear deformation of each protective layer of the optical fiber has an attenuation effect on the structural strain, so that the strain transmission coefficient of the optical fiber needs to be calibrated. The optical fiber is also affected by temperature and angle during monitoring, and the temperature sensitive coefficient and the angle coefficient of the optical fiber need to be calibrated. Most of the existing equipment for calibrating distributed optical fiber strain is a calibration plate and a calibration frame for hanging heavy objects, which are manufactured by scientific research teams, and the equipment has the defects of difficult manufacture, complex operation, low accuracy and the like, is heavy, has single function, and needs to be miniaturized and accurate; generally, the optical fiber is soaked in water, and the temperature coefficient of the optical fiber is calibrated in a mode of changing the water temperature, which is not standard; the optical fiber calibration instrument has few instruments for calibrating the angle coefficient of the optical fiber, and needs an optical fiber calibration instrument capable of integrating the functions of temperature, angle, strain calibration and the like.
Disclosure of Invention
The invention provides a fiber grating sensor calibrator for overcoming at least one defect in the prior art, which can simultaneously perform temperature calibration, angle calibration and strain calibration of an optical fiber and is simple and convenient to operate.
In order to solve the technical problems, the invention adopts the technical scheme that: a fiber grating sensor calibration instrument comprises a base, a calibration plate, a temperature calibration mechanism for heating the calibration plate, an angle calibration mechanism for enabling optical fibers to generate bending deformation and a strain calibration mechanism for enabling the optical fibers to generate elastic deformation; the calibration plate, the temperature calibration mechanism, the angle calibration mechanism and the strain calibration mechanism are all arranged on the base; the base is provided with an optical fiber socket, the optical fiber to be detected is fixed on the calibration plate, the optical fiber to be detected is connected with the optical fiber socket, and the other end of the optical fiber socket is connected with the optical fiber demodulator. One end of the optical fiber socket is used for being connected with an optical fiber to be detected, and the other end of the optical fiber socket is connected to an optical fiber demodulator to be used, so that different types of demodulators can be matched according to detection requirements; when the temperature-sensitive optical fiber calibration device is used, the optical fiber is fixed on the calibration plate, and the calibration plate is heated through the temperature calibration mechanism, so that the optical fiber is heated, and the temperature-sensitive coefficient of the optical fiber is detected; the optical fiber is bent to a certain degree through an angle calibration mechanism, so that the angle sensitivity coefficient of the optical fiber is detected; and the optical fiber is subjected to strain deformation through the strain calibration mechanism, so that the strain coefficient of the optical fiber is detected. The calibration instrument provided by the invention can simultaneously realize the calibration of the angle, the temperature and the strain coefficient, and is simple and convenient to operate.
Furthermore, a support column is arranged on the base, one end of the calibration plate is fixed on the support column, and the other end of the calibration plate is suspended.
Furthermore, the temperature calibration mechanism comprises a motor and a heating wire; the motor is fixed on the base, the heating wire penetrates through the interior of the calibration plate, and the heating wire is electrically connected with the motor; the base is also provided with a temperature control switch which is electrically connected with the motor. The calibration plate is a PVC plate with good thermal inductance, the heating wire is arranged in the calibration plate, and the heating wire is controlled by a motor to heat the calibration plate; the optical fiber is fixed on the calibration plate, so that the optical fiber is heated; and reading the temperature of the optical fiber and demodulating the data of the optical fiber on the instrument so as to obtain the temperature sensitive coefficient of the optical fiber.
Furthermore, the angle calibration mechanism comprises a first angle plate, a second angle plate and a first lifting strut; a through hole is formed in the calibration plate, one end of the first lifting support is fixed on the base, the other end of the first lifting support is connected with the first angle plate, and the first angle plate is located right below the through hole; the second angle plate is fixed on the first cantilever plate, the other end of the first cantilever plate is fixed on the support column, and the second angle plate is positioned right above the through hole; the first lifting support can drive the first angle plate to do lifting motion, so that the first angle plate and the second angle plate are meshed or separated; the optical fiber to be detected is located between the first angle plate and the second angle plate. The optical fiber is fixed on the calibration plate, and a section of the optical fiber is positioned on the through hole in the middle; the second angle plate is just above the through hole, and preferably, the second angle plate just contacts with the optical fiber; when the optical fiber lifting device is used, the first angle plate is driven to do lifting motion through the first lifting support, the optical fiber is jacked up by the first angle plate in the lifting process until the first angle plate and the second angle plate are mutually occluded, and at the moment, the optical fiber is clamped between the first angle plate and the second angle plate; therefore, the optical fiber is bent, and the bending angle of the optical fiber is read; and demodulating the data of the optical fiber on the instrument so as to obtain the angle sensitivity coefficient of the optical fiber.
Furthermore, the second angle plate is connected with the first cantilever plate through a rotating shaft, the rotating shaft is connected with a rotating valve, and the rotating valve can drive the second angle plate to rotate. The second angle plate rotates by a certain angle by controlling the rotary valve, so that the first angle plate and the second angle plate are not completely opposite, when the first angle plate and the second angle plate are meshed, and optical fibers are bent, a certain included angle is generated, and the variable of the included angle is increased in calibration.
Furthermore, the first angle plate and the second angle plate are both wave-shaped structures; the wave-shaped structure of the first angle plate and the wave-shaped structure of the second angle plate can be mutually meshed. The first angle plate and the second angle plate are designed into mutually corresponding and engageable wave-shaped structures, so that the optical fiber clamped in the first angle plate and the second angle plate can be bent in multiple sections.
Furthermore, a side plate is arranged beside the first angle plate, and an angle scale corresponding to the first angle plate and the second angle plate is arranged on the side plate. The side plates are provided with angle scales corresponding to various bending angles, and the bending angles of the optical fibers can be read according to the angle scales.
Further, the strain calibration mechanism comprises a second lifting strut and a weight tray; the second lifting support is arranged below the calibration plate, and when the second lifting support does ascending motion, the calibration plate can be jacked up to deform; a weight tray is hung at the other end of the calibration plate connected with the support column, and a strain gauge is also attached to the calibration plate. The calibration plate is made of a material with a smaller elastic modulus, and can be bent when weights are placed in the weight tray; a strain gauge is attached to the calibration plate, so that the strain value of the calibration plate can be read at any time; in addition, when the second lifting support is controlled to do lifting motion, the second lifting support can jack the calibration plate upwards, so that the calibration plate is bent; when the scale is used, the optical fibers are fixed on the calibration plate, the calibration plate is bent by placing weights in the weight tray, and the optical fibers are driven to be bent together when the calibration plate is bent; reading a strain value of a strain gauge and data of a demodulator optical fiber to obtain a strain coefficient of the optical fiber; or the second lifting support is controlled to bend the calibration plate, and the strain value of the strain gauge, the lifting distance of the second lifting support and the data of the optical fiber on the demodulator are read, so that the strain coefficient of the optical fiber is obtained.
Furthermore, the first lifting support and the second lifting support are both provided with a display screen and a lifting switch for displaying lifting numerical values. When the lifting device is used, the first lifting support and the second lifting support are controlled to do lifting motion by controlling the lifting switch, the lifting distance can be displayed on the display screen in real time, and the required lifting numerical value can be accurately controlled by an operator conveniently.
Furthermore, a groove for fixing the optical fiber is formed from one end of the calibration plate to the other end of the calibration plate, and the groove is located on the center line of the calibration plate. The optical fiber calibration plate is characterized in that the groove is preferably a semicircular groove and is arranged along the center line of the calibration plate, the diameter value of the groove is slightly larger than that of the optical fiber, the inner wall of the groove is smooth and free of burrs, when the optical fiber calibration plate is used, glue is firstly dripped into the groove, then the optical fiber is placed in the groove, and the optical fiber is fixed in the groove through the glue.
Compared with the prior art, the beneficial effects are: the fiber grating sensor calibrator provided by the invention can calibrate the temperature, the angle and the strain coefficient of an optical fiber at the same time, and is simple and convenient to operate; the accuracy of the optical fiber calibration coefficient is effectively improved, and the efficiency is also improved.
Drawings
Fig. 1 is a schematic diagram of the overall structure of the calibration instrument of the present invention.
Fig. 2 is a front view of the calibrator of the present invention.
Fig. 3 is a schematic structural diagram of the angle calibration mechanism of the present invention.
Fig. 4 is a schematic diagram of the structure of the calibration plate of the present invention.
Detailed Description
The drawings are for illustration purposes only and are not to be construed as limiting the invention; for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted. The positional relationships depicted in the drawings are for illustrative purposes only and are not to be construed as limiting the invention.
Example 1:
as shown in fig. 1 to 4, a fiber grating sensor calibration instrument includes a base 1, a calibration plate 2, a temperature calibration mechanism for heating the calibration plate 2, an angle calibration mechanism for bending and deforming an optical fiber, and a strain calibration mechanism for elastically deforming the optical fiber; the calibration plate 2, the temperature calibration mechanism, the angle calibration mechanism and the strain calibration mechanism are all arranged on the base 1; the base 1 is provided with a support column 4, one end of the calibration plate 2 is fixed on the support column 4, and the other end is suspended. An optical fiber socket 3 is arranged on the base 1, an optical fiber to be detected is fixed on the calibration plate 2, the optical fiber to be detected is connected with the optical fiber socket 3, and the other end of the optical fiber socket 3 is connected with an optical fiber demodulator. One end of the optical fiber socket 3 is used for being connected with an optical fiber to be detected, and the other end of the optical fiber socket is connected to an optical fiber demodulator to be used, so that different types of demodulators can be matched according to detection requirements; when the temperature-sensitive optical fiber calibration device is used, the optical fiber is fixed on the calibration plate 2, and the calibration plate 2 is heated through the temperature calibration mechanism, so that the optical fiber is heated, and the temperature-sensitive coefficient of the optical fiber is detected; the optical fiber is bent to a certain degree through an angle calibration mechanism, so that the angle sensitivity coefficient of the optical fiber is detected; and the optical fiber is subjected to strain deformation through the strain calibration mechanism, so that the strain coefficient of the optical fiber is detected. The calibration instrument provided by the invention can simultaneously realize the calibration of the angle, the temperature and the strain coefficient, and is simple and convenient to operate.
Specifically, the temperature calibration mechanism comprises a motor and a heating wire 5; the motor is fixed on the base 1, the heating wire 5 penetrates through the interior of the calibration plate 2, and the heating wire 5 is electrically connected with the motor; a temperature control switch 6 is also arranged on the base 1, and the temperature control switch 6 is electrically connected with the motor. The calibration plate 2 is a PVC plate with good thermal inductance, the heating wire 5 is arranged in the calibration plate 2, and the heating wire 5 is controlled by a motor to heat the calibration plate 2; the optical fiber is fixed on the calibration plate 2, so that the optical fiber is heated; and reading the temperature of the optical fiber and demodulating the data of the optical fiber on the instrument so as to obtain the temperature sensitive coefficient of the optical fiber.
As shown in fig. 1 and 3, the angle calibration mechanism includes a first angle plate 7, a second angle plate 8, and a first lifting column 9; a through hole 11 is formed in the calibration plate 2, one end of the first lifting support 9 is fixed on the base 1, the other end of the first lifting support is connected with the first angle plate 7, and the first angle plate 7 is positioned right below the through hole 11; the second angle plate 8 is fixed on the first cantilever plate 10, the other end of the first cantilever plate 10 is fixed on the support column 4, and the second angle plate 8 is positioned right above the through hole 11; the first lifting support 9 can drive the first angle plate 7 to do lifting movement, so that the first angle plate and the second angle plate 8 are meshed or separated; the optical fiber to be detected is located between the first angle plate 7 and the second angle plate 8. The optical fiber is fixed on the calibration plate 2, and a section of the optical fiber is positioned on the through hole 11 in the middle; the second angle plate 8 is just above the through hole 11, and the second angle plate 8 just contacts with the optical fiber; when the optical fiber lifting device is used, the first angle plate 7 is driven to do lifting motion through the first lifting support 9, in the lifting process, the first angle plate 7 jacks up the optical fiber until the first angle plate 7 and the second angle plate 8 are mutually meshed, and at the moment, the optical fiber is clamped between the first angle plate 7 and the second angle plate 8; therefore, the optical fiber is bent, and the bending angle of the optical fiber is read; and demodulating the data of the optical fiber on the instrument so as to obtain the angle sensitivity coefficient of the optical fiber.
As shown in fig. 3, the first angle plate 7 and the second angle plate 8 are both wave-shaped structures; the wave-shaped structure of the first angle plate 7 and the wave-shaped structure of the second angle plate 8 can be engaged with each other. The first angle plate 7 and the second angle plate 8 are designed into mutually corresponding and engageable wave-shaped structures, so that the optical fiber clamped in the first angle plate can be bent in multiple stages.
As shown in fig. 1 and 2, the strain gauge mechanism comprises a second lifting column 13 and a weight tray 14; the second lifting support column 13 is arranged below the calibration plate 2, and when the second lifting support column 13 performs lifting motion, the calibration plate 2 can be jacked up to generate deformation; a weight tray 14 is hung at the other end of the calibration plate 2 connected with the support column 4, and a strain gauge 15 is also attached to the calibration plate 2. The calibration plate 2 is made of a material with a small elastic modulus, and when weights are placed in the weight tray 14, the calibration plate 2 can be bent; the strain gauge 15 is pasted on the calibration plate 2, so that the strain value of the calibration plate 2 can be read at any time; in addition, when the second lifting support 13 is controlled to do lifting motion, the second lifting support 13 can jack the calibration plate 2 upwards, so that the calibration plate 2 is bent; when in use, the optical fibers are fixed on the calibration plate 2, the calibration plate 2 is bent by placing weights in the weight tray 14, and the optical fibers are driven to be bent together when the calibration plate 2 is bent; reading the strain value of the strain gauge 15 and the data of the demodulation instrument optical fiber to obtain the strain coefficient of the optical fiber; or the calibration plate 2 is bent by controlling the second lifting support 13, and the strain value of the strain gauge 15, the lifting distance of the second lifting support 13 and the data of the optical fiber on the demodulator are read, so that the strain coefficient of the optical fiber is obtained.
As shown in fig. 4, a groove 16 for fixing an optical fiber is formed from one end to the other end of the calibration plate 2, and the groove 16 is located at the center line of the calibration plate 2. The groove 16 is preferably a semicircular groove 16, which is disposed along the center line of the calibration plate 2, and the diameter of the groove 16 is slightly larger than that of the optical fiber, and the inner wall of the groove 16 is smooth and burr-free, and when in use, glue is first dropped into the groove 16, and then the optical fiber is placed in the groove 16, and the optical fiber is fixed in the groove 16 by the glue.
Example 2
As shown in fig. 3, this embodiment is similar to the other army structures of embodiment 1, except that a display screen 18 and a lifting switch 17 for displaying a lifting value are provided on each of the first lifting column 9 and the second lifting column 13. When the lifting device is used, the first lifting support 9 and the second lifting support 13 are controlled to do lifting movement by controlling the lifting switch 17, the lifting distance can be displayed on the display screen 18 in real time, and an operator can accurately control the required lifting numerical value conveniently.
Example 3
This embodiment is similar to the other mechanisms of embodiment 1, except that the second angle plate 8 is connected to the first cantilever plate 10 through a rotating shaft, the rotating shaft is connected to a rotary valve 12, and the rotary valve 12 can drive the second angle plate 8 to rotate. The second angle plate 8 rotates by a certain angle by controlling the rotary valve 12, so that the first angle plate 7 and the second angle plate 8 are not completely opposite, when the first angle plate 7 and the second angle plate 8 are occluded, a certain included angle is generated when the optical fiber is bent, and the variable of the included angle is increased in calibration.
Example 4
This embodiment is similar to the other mechanisms of embodiment 1, except that a side plate is further provided beside the first angle plate 7, and an angle scale corresponding to the first angle plate 7 and the second angle plate 8 is provided on the side plate. The side plates are provided with angle scales corresponding to various bending angles, and the bending angles of the optical fibers can be read according to the angle scales.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (8)
1. The fiber bragg grating sensor calibrator is characterized by comprising a base (1), a calibration plate (2), a temperature calibration mechanism for heating the calibration plate (2), an angle calibration mechanism for enabling an optical fiber to generate bending deformation and a strain calibration mechanism for enabling the optical fiber to generate elastic deformation; the calibration plate (2), the temperature calibration mechanism, the angle calibration mechanism and the strain calibration mechanism are all arranged on the base (1); an optical fiber socket (3) is arranged on the base (1), an optical fiber to be detected is fixed on the calibration plate (2), the optical fiber to be detected is connected with the optical fiber socket (3), and the other end of the optical fiber socket (3) is connected with an optical fiber demodulator; a supporting column (4) is arranged on the base (1), one end of the calibration plate (2) is fixed on the supporting column (4), and the other end is suspended in the air; the angle calibration mechanism comprises a first angle plate (7), a second angle plate (8) and a first lifting support column (9); a through hole (11) is formed in the calibration plate (2), one end of the first lifting support (9) is fixed on the base (1), the other end of the first lifting support is connected with the first angle plate (7), and the first angle plate (7) is positioned right below the through hole (11); the second angle plate (8) is fixed on the first cantilever plate (10), the other end of the first cantilever plate (10) is fixed on the support column (4), and the second angle plate (8) is positioned right above the through hole (11); the first lifting strut (9) can drive the first angle plate (7) to do lifting movement, so that the first angle plate (8) is meshed with or separated from the second angle plate; the optical fiber to be detected is located between a first angle plate (7) and a second angle plate (8).
2. The fiber grating sensor calibration instrument according to claim 1, wherein the temperature calibration mechanism comprises a motor and a heating wire (5); the motor is fixed on the base (1), the heating wire (5) penetrates through the interior of the calibration plate (2), and the heating wire (5) is electrically connected with the motor; the base (1) is also provided with a temperature control switch (6), and the temperature control switch (6) is electrically connected with the motor.
3. The fiber bragg grating sensor calibrator according to claim 2, wherein the second angle plate (8) is connected with the first cantilever plate (10) through a rotating shaft, the rotating shaft is connected with a rotary valve (12), and the rotary valve (12) can drive the second angle plate (8) to rotate.
4. The fiber bragg grating sensor calibrator according to claim 2, wherein the first angle plate (7) and the second angle plate (8) are both of a wave-shaped structure; the wave-shaped structure of the first angle plate (7) and the wave-shaped structure of the second angle plate (8) can be mutually meshed.
5. The fiber grating sensor calibrator according to claim 4, wherein a side plate is further disposed beside the first angle plate (7), and an angle scale corresponding to the first angle plate (7) and the second angle plate (8) is disposed on the side plate.
6. The fiber bragg grating sensor calibration instrument according to claim 2, wherein the strain calibration mechanism comprises a second lifting pillar (13), a weight plate (14) and a strain gauge (15); the second lifting support column (13) is arranged below the calibration plate (2), and when the second lifting support column (13) moves upwards, the calibration plate (2) can be jacked up to deform; a weight tray (14) is hung at the other end of the calibration plate (2) connected with the support column (4), and the strain gauge (15) is attached to the calibration plate (2).
7. The fiber grating sensor calibrator according to claim 6, wherein the first lifting column (9) and the second lifting column (13) are respectively provided with a display screen (18) and a lifting switch (17) for displaying a lifting value.
8. The fiber bragg grating sensor calibrator according to any one of claims 1 to 7, wherein a groove (16) for fixing an optical fiber is formed from one end to the other end of the calibration plate (2), and the groove (16) is arranged along the center line of the calibration plate (2).
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| CN110926357B (en) * | 2019-12-09 | 2020-12-11 | 哈尔滨工业大学 | Method for constructing puncture needle shape change calibration model |
| CN112985291A (en) * | 2019-12-12 | 2021-06-18 | 中国矿业大学 | Optical fiber curvature sensor calibration control equipment |
| CN113252092B (en) * | 2020-02-13 | 2022-11-01 | 中国科学院理化技术研究所 | Strain temperature control experiment testing device and testing method thereof |
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