CN115015578A - Optical fiber accelerometer probe and system of symmetrical double-reed supporting structure - Google Patents
Optical fiber accelerometer probe and system of symmetrical double-reed supporting structure Download PDFInfo
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- 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
- G01P15/03—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses by using non-electrical means
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Abstract
The invention discloses a fiber optic accelerometer probe with a symmetrical double-reed supporting structure and a system, wherein the fiber optic accelerometer probe comprises a fiber optic head, a fiber optic clamp, a reflector, an integrated shell, a first elastic reed, a second elastic reed, a first mass block, a central mass block, a second mass block and a base ring; the optical fiber head is fixed on the optical fiber clamp, and the optical fiber end surface of the optical fiber head and the reflector form a Fabry-Perot cavity interference cavity; the initial cavity length of the Fabry-Perot cavity interference cavity is adjustable. In the invention, the two elastic reeds symmetrically support the mass block, so that the transverse crosstalk perpendicular to the input shaft direction can be reduced. Meanwhile, compared with a single reed, the double reeds can support a larger mass block, so that the mechanical thermal noise of the accelerometer spring oscillator structure is reduced. In addition, as the optical fiber clamp and the integrated shell are both provided with threads, the initial cavity length of the Fabry-Perot cavity can be flexibly controlled by screwing the optical fiber clamp into the integrated shell in a spiral mode.
Description
Technical Field
The invention belongs to the field of optical fiber interferometry, and particularly relates to an optical fiber accelerometer probe with a symmetrical double-reed supporting structure and a system.
Background
The accelerometer is an inertial instrument for measuring the acceleration of an object, plays an important role in an acceleration measuring system, and is widely applied to the fields of biomedicine, traffic application, geological disaster prediction, aerospace and the like. According to different detection modes, the accelerometer can be divided into a capacitance type, a piezoresistive type, a resonant type, an optical type and the like, wherein the optical type accelerometer has the advantages of high precision, high sensitivity, strong anti-electromagnetic interference capability and the like. Meanwhile, the signal processing unit of the optical fiber interference type accelerometer is completely separated from the passive sensing probe, so that the maintenance cost caused by instrument faults can be effectively reduced, and the optical fiber interference type accelerometer is very suitable for being used in complex and severe environments.
The extrinsic fiber Fabry-Perot (F-P) interferometer composed of the fiber end face and the external reflector has the advantages of strong common mode noise suppression capability, no contact, simple structure and the like, is widely applied to acceleration measurement, and has the working principle that: the displacement change of the external reflector caused by external acceleration changes the cavity length of the Fabry-Perot cavity, so that the interference phase changes, and the acceleration information can be acquired through phase demodulation, light intensity demodulation and other modes.
At present, accelerometers based on a metal flexible spring oscillator system have been reported, and patent document (201510519101.4) discloses an interference type fiber accelerometer probe and a fiber accelerometer system, which provide a two-loop elastic membrane with petal-shaped distribution arc array, which has good plane symmetry and can improve the measurement accuracy of acceleration values, however, the spring oscillator system of the interference type fiber accelerometer probe adopts a single-spring-sheet supporting structure, which is easy to introduce lateral crosstalk and affects the measurement of the acceleration values. In addition, in the design and processing of the device for the spring oscillator system, the length of the initial cavity of the Fabry-Perot cavity formed after the optical fiber head and the spring oscillator system are integrated is a fixed value, and the length of the initial cavity of the Fabry-Perot cavity cannot be flexibly controlled.
Disclosure of Invention
Aiming at the defects or improvement requirements of the prior art, the invention provides a fiber accelerometer probe with a symmetrical double-reed supporting structure and a system thereof, aiming at solving the technical problems that the single-reed supporting structure in the prior art is easy to introduce transverse crosstalk and the initial cavity length of a Fabry-Perot cavity can not be flexibly controlled.
To achieve the above object, according to one aspect of the present invention, there is provided a fiber optic accelerometer probe of a symmetrical dual-reed support structure, comprising: the device comprises an optical fiber head, an optical fiber clamp, a reflector, an integrated shell, a first elastic spring, a second elastic spring, a first mass block, a central mass block, a second mass block and a base ring; the optical fiber head is fixed on the optical fiber clamp, and the optical fiber end surface of the optical fiber head and the reflector form a Fabry-Perot cavity interference cavity; the initial cavity length of the Fabry-Perot cavity interference cavity is adjustable; the first mass block and the second mass block are symmetrically fixed on two sides of the central mass block; the center of the first elastic spring plate is fixed on the first mass block, and the center of the second elastic spring plate is fixed on the second mass block; the edge of the first elastic reed is connected with the base ring, and the edge of the second elastic reed is connected with the base ring; the integrated shell is connected with the base ring and used for sealing a spring oscillator structure consisting of a first elastic spring leaf, a second elastic spring leaf, a first mass block, a central mass block and a second mass block. When the device works, the fiber accelerometer probe can be fixed on an object to be measured by the fixing support.
Still further, the fiber optic accelerometer probe further comprises: the first reed inner clamping plate, the second reed inner clamping plate, the first reed outer clamping plate and the second reed outer clamping plate; the center of the first spring reed is fixed on the first mass block through a first reed inner clamping plate, and the center of the second spring reed is fixed on the second mass block through a second reed inner clamping plate; the edge of the first elastic reed is connected with the base ring through the first reed outer clamping plate, and the edge of the second elastic reed is connected with the base ring through the second reed outer clamping plate.
Still further, the fiber-optic accelerometer probe further comprises: the first boss is fixed on the first mass block, and the second boss is fixed on the first boss; the reflector is fixed on the plane of the first boss and the second boss.
Furthermore, the optical fiber clamp is provided with external threads, the integrated shell is provided with internal threads, and the distance between the optical fiber head and the reflector can be adjusted by screwing the optical fiber clamp into the integrated shell, so that the adjustable initial cavity length of the Fabry-Perot cavity interference cavity is realized.
Furthermore, the optical fiber head is an optical fiber jumper plug, the optical fiber end face of the optical fiber head is ground and polished by a microsphere face, and the cavity length of the Fabry-Perot cavity interference cavity is 900-2000 mu m.
Furthermore, the shape of the first elastic spring leaf and the second elastic spring leaf is a circular structure with two circles of six annular notches, and the thickness of the first elastic spring leaf and the second elastic spring leaf is 80-120 mu m.
Furthermore, the reflector is plated with a thin film material, and the reflectivity of the thin film material is 0.04-1.
Still further, the fiber optic accelerometer probe further comprises: the first balancing weight is fixed on the second balancing weight, and the second balancing weight is fixed on the first balancing weight.
The invention also provides an optical fiber accelerometer system with a double-reed symmetrical supporting structure, which comprises an optical fiber accelerometer probe, a detection light source, an optical module, a photoelectric detection module and a signal acquisition system; the fiber optic accelerometer probe is the fiber optic accelerometer probe; the optical module comprises a first port, a second port and a third port, the first port is connected with the detection light source, the second port is connected with the fiber accelerometer probe, the third port is connected with the photoelectric detection module, the input light of the first port is output through the second port, and the input light of the second port is output through the third port; the optical fiber accelerometer probe is used for converting an acceleration signal into an optical signal; the detection light source is used for providing laser required by the system; the optical module is used for inputting laser to the fiber accelerometer probe and guiding an optical signal of the fiber accelerometer probe into the photoelectric detection module; the photoelectric detection module is used for converting an optical signal of the fiber accelerometer probe into an electrical signal; the signal acquisition system is used for acquiring and processing the electrical signals to obtain acceleration signals.
The detection light source can be a narrow linewidth fiber laser, and the optical module can be an optical fiber circulator.
Generally, compared with the prior art, the above technical solution conceived by the present invention has the following beneficial effects:
(1) in the invention, because the two elastic reeds symmetrically support the mass block, the transverse crosstalk perpendicular to the input shaft direction can be reduced. Meanwhile, compared with a single reed, the double reeds can support a larger mass block, so that the mechanical thermal noise of the accelerometer spring oscillator structure is reduced.
(2) In the invention, as the optical fiber clamp and the integrated shell are both provided with threads, the initial cavity length of the Fabry-Perot cavity can be flexibly controlled by screwing the optical fiber clamp into the integrated shell in a spiral manner.
(3) The optical fiber accelerometer probe with the double-reed symmetrical support structure adopts the optical fiber Fabry-Perot interference cavity as a sensitive structure, and the optical fiber end surface of the optical fiber head and the reflector form the Fabry-Perot cavity interference cavity, so that the optical fiber accelerometer probe has good common-mode noise suppression characteristics and can perform high-precision measurement on a to-be-measured quantity; and the transverse crosstalk of the accelerometer probe is low, so that the acceleration measurement noise is lower, and the acceleration measurement precision is high. Therefore, the invention has the advantages of simple structure, small volume, easy processing and capability of being integrated on various devices and equipment to realize high-precision acceleration detection.
Drawings
Fig. 1 is a schematic structural internal cross-sectional view of a fiber-optic accelerometer probe with a symmetric dual-reed support structure according to an embodiment of the present invention;
FIG. 2(a) is one of the inside views of a fiber optic accelerometer probe with a symmetric dual-reed support structure according to an embodiment of the invention;
fig. 2(b) is a second internal view of a fiber-optic accelerometer probe with a symmetric dual-reed supporting structure according to an embodiment of the invention;
FIG. 3 is an oblique view of a fiber optic accelerometer probe with a symmetrical dual-reed support structure according to an embodiment of the invention;
fig. 4 is a schematic diagram of an extrinsic fiber fabry-perot cavity of a fiber accelerometer probe with a symmetric dual-reed support structure according to an embodiment of the present invention;
fig. 5 is a block diagram of a fiber-optic accelerometer system with a symmetric dual-reed support structure according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other. The present invention will be described in further detail with reference to specific embodiments.
Fig. 1 is a schematic cross-sectional view of the internal structure of a fiber-optic accelerometer probe with a symmetric dual-reed support structure according to the present invention, as shown in fig. 1, the accelerometer probe includes a fiber-optic head 1, a fiber-optic clamp 2, a reflector 3, a first boss 4a, a second boss 4b, an integrated housing 5, a first reed inner clamp plate 6a, a second reed inner clamp plate 6b, a first reed outer clamp plate 7a, a second reed outer clamp plate 7b, a first elastic reed 8a, a second elastic reed 8b, a first mass block 9a, a central mass block 10, a second mass block 9b, a first counterweight block 11a, a second counterweight block 11b, a package housing 12, a base ring 13, and a fixing bracket 14, and an extrinsic fiber-optic fabry-perot interferometer is used as a sensing element;
through holes are formed in the first mass block 9a, the second mass block 9b and the central mass block 10, and the first mass block 9a and the second mass block 9b are symmetrically fixed on two sides of the central mass block 10 through screws; the first mass block 9a and the second mass block 9b are provided with two layers of step bulges, each layer of step bulges are provided with threaded holes, the first reed inner clamping plate 6a and the second reed inner clamping plate 6b are provided with through holes, the position of a through hole of the elastic spring 8a corresponds to the position of a threaded hole on a projection of a middle step of a first mass block 9a and a second mass block 9b, the central through hole of the first elastic spring 8a penetrates through the projection of the outermost step of the first mass block 9a and is placed on the middle step of the first mass block 9a, a screw sequentially penetrates through the first spring inner clamping plate 6a and the first elastic spring 8a to fix the elastic spring on the first mass block 9a, the central through hole of the second elastic spring 8b penetrates through the projection of the outermost step of the second mass block 9b and is placed on the middle step of the second mass block 9b, and the screw sequentially penetrates through the second spring inner clamping plate 6b and the first elastic spring 8b to fix the elastic spring on the second mass block 9 b; two bottom surfaces of the base ring 13 are provided with grooves, threaded holes are formed in the grooves, the outer edge of the first elastic reed 8a is placed on the groove of the bottom surface on one side of the base ring 18, a screw sequentially penetrates through the first reed outer clamping plate 7a and the first elastic reed 8a to be connected with the base ring 18, the outer edge of the second elastic reed 8b is placed on the groove of the bottom surface on the other side of the base ring 18, and a screw sequentially penetrates through the second reed outer clamping plate 7b and the second elastic reed 8b to be connected with the base ring 18; fixing the first boss 4a on the outermost step bulge of the first mass block 9a by using a screw, and fixing the second boss 4b on the first boss 4a by using a screw; fixing the reflector 3 on the plane of the first boss 4a and the second boss 4b by 502 glue; the integrated housing 5 is connected with a base ring 18; the optical fiber head 1 is fixed in the optical fiber clamp 2 and is fixed on the integrated shell 5 through the optical fiber clamp 2; the first balancing weight 11a is fixed on the second mass block 9b, the second balancing weight 11b is fixed on the first balancing weight 11a, and the packaging shell 12 is connected with the base ring 13; the integrated housing 5, base ring 13 and encapsulating housing 12 enclose the whole spring oscillator system therein.
In the embodiment of the invention, the middle of the first boss 4a needs to be drilled and fixed to the first mass block 9a, the second boss 4b is fixed to the first boss 4a, and the reflector is attached to a plane formed by the first boss 4a and the second boss 4 b. If the first boss 4a and the second boss 4b are replaced with one boss, the boss must be bored and fixed to the first mass block 9a so that the boss is not flat, resulting in the mirror not being perpendicular and not being parallel to the optical fiber head 1, thereby introducing an acceleration measurement error. Therefore, the embodiment of the present invention requires a structure in which two bosses are provided.
Fig. 2(a) and (b) are respectively one of the internal views of the fiber accelerometer probe with a symmetric dual-reed supporting structure of the present invention, and fig. 3 is an oblique view of the fiber accelerometer probe with a symmetric dual-reed supporting structure of the present invention, as shown in fig. 2(a), (b) and fig. 3, the reflector 3, the first boss 4a, the second boss 4b, the first reed internal clamp plate 6a, the second reed internal clamp plate 6b, the first elastic reed 8a, the second elastic reed 8b, the first mass block 9a, the central mass block 10, the second mass block 9b, the first counterweight block 11a and the second counterweight block 11b form an integral mass block together; the edge part of the first spring reed 8a is connected to the base ring 18 by the first reed outer hinge plate 7a, and similarly, the edge part of the second spring reed 8b is connected to the base ring 18 by the second reed outer hinge plate 7 b; the central part of the first spring reed 8a is connected with the integral mass block by the first reed inner transfer plate 6a, and similarly, the central part of the second spring reed 8b is connected with the integral mass block by the second reed inner transfer plate 6 b; the integral mass block is symmetrically supported by the first elastic diaphragm 8a and the second elastic diaphragm 8b and is suspended in the center of the inner part of the base ring 13; the fiber optic accelerometer probe is fixed on an object to be measured through the fixing support 14, when external acceleration is input, the mass block is driven to move left and right through the elastic force of the elastic reed, the cavity length change of the Fabry-Perot cavity is caused, and the acceleration measurement can be realized by measuring the cavity length change.
In the embodiment of the invention, because the two reeds are symmetrically supported, the moving directionality of the mass block can be improved, namely, the mass block can better move along the vibration direction of the first-order mode of the reeds, so that the transverse crosstalk is reduced.
Fig. 4 is a schematic diagram of an extrinsic fiber fabry-perot cavity of a fiber accelerometer probe with a symmetric double-reed support structure, as shown in fig. 4, a fiber head 1 is a jumper plug, an interference cavity is formed by a fiber end face of the fiber head 1 and a reflector 3, and the cavity length d is 900 μm to 2000 μm.
The invention relates to a novel mode for integrating an optical fiber head and a spring oscillator system, wherein the optical fiber head 1 is fixed on an optical fiber clamp 2, the optical fiber clamp 2 is an optical fiber adapter provided with external threads, the inner side of an integrated shell 5 is provided with internal threads, the optical fiber clamp 2 is screwed into the integrated shell 5, the cavity length of a Fabry-Perot cavity can be flexibly controlled by screwing the optical fiber clamp 2 in the integrated shell 5, 502 glue is dropped for fixing after the initial cavity length is determined, and the initial cavity length is not adjustable any more after the fixing.
In the embodiment of the invention, as the optical fiber clamp 2 is provided with the external thread and the integrated shell 5 is provided with the internal thread, the distance between the optical fiber head 1 and the reflector 3 can be adjusted by screwing the optical fiber clamp 2 into the integrated shell 5, thereby realizing the adjustment of the initial cavity length of the Fabry-Perot cavity interference cavity; when the optical fiber clamp 2 is screwed deeper, the cavity length of the Fabry-Perot cavity interference cavity is smaller; the cavity length of the fabry-perot cavity interference cavity is larger the shallower the fiber clamp 2 is screwed in.
FIG. 5 is a block diagram of a fiber-optic accelerometer system with a symmetrical double-reed supporting structure according to the present invention, which includes a detection light source 16, an optical module 17, a fiber-optic accelerometer probe 15, a photoelectric detection module 18, and a signal acquisition system 19; the light emitted by the detection light source 16 is input into a first port of the optical module 17, the input light of the first port is output through a second port, the output light of the second port is transmitted to the fiber accelerometer probe 15, the fiber end surface of the fiber head 1 and the reflector 3 are positioned inside the fiber accelerometer probe 15 in parallel, a part of the light signal transmitted to the fiber accelerometer probe 15 is reflected by the fiber end surface of the fiber head 1, a part of the light signal is transmitted to the reflector 3 and is reflected by the reflector 3, the light signal reflected by the reflector 3 interferes with the light signal reflected by the fiber head 1, the interference light signal is transmitted to a second port of the optical module 17, the input light of the second port is output through a third port, the output light of the third port is transmitted to the photoelectric detection module 18, the light signal is converted into an electrical signal, and finally, data acquisition is performed by the signal acquisition system 19.
In the fiber accelerometer probe, the fiber head 1 and the reflector 3 form an extrinsic fiber Fabry-Perot interference structure to read acceleration signals, and the extrinsic fiber Fabry-Perot interference structure has the advantages of strong common-mode noise suppression capability and simple structure, so that an acceleration system has the advantages of high precision and low cost.
The optical field reflected by the fiber end face of the fiber head 1 can be expressed as:
the light field reflected by the mirror 3 can be expressed as:
the optical field output by the third port of the optical module 17 is:
E＝E 1 +E 2
wherein R is 1 、R 2 The reflectivity, A, of the fiber end face of the fiber head 1 and the mirror 3, respectively 0 Is the amplitude of the incident light and,
d is the vertical distance between the fiber end face of the fiber tip 1 and the mirror 3, which is the initial phase of the incident light.
And then the output light intensity of the photoelectric detection module is obtained as follows:
the cavity length change of the Fabry-Perot cavity is caused by the input of external acceleration, and the cavity length change can be obtained through phase demodulation, light intensity demodulation and the like, so that the acceleration information is obtained.
As a preferred embodiment, the reflector is a silicon wafer plated with an aluminum film, which has the advantages of thin thickness, easy plating of a high-reflectivity metal film and low cost, and in addition, other plating materials or reflector materials can be used for replacement according to requirements. The silicon chip is thin and has the thickness of only about 50 mu m, the metal film is easy to be plated to increase the reflectivity, and the cost is low.
As a preferred embodiment, the shape of the elastic spring is a circular structure with two circles of six annular notches, the thickness of the elastic spring is 80-120 μm, and the material of the elastic spring is beryllium copper. The elastic reed has the advantages of low eigenfrequency, high cross rejection ratio and long service life, and is beneficial to reducing the acceleration measurement noise and prolonging the service life of the accelerometer.
The elastic reed in the embodiment of the invention adopts the shape, so that the eigenfrequency of the spring oscillator structure can be reduced, the cross axis suppression ratio is improved, namely the high-order mode of the vibration of the elastic reed is not easy to generate interference on the first-order mode, and the measurement noise of the acceleration is reduced.
In addition, the thicker the reed, the higher the rigidity, the lower the cross-axis suppression ratio is, so that the acceleration measurement noise is large; the thinner the reed, the smaller the stiffness, the higher the cross-axis rejection ratio, and the less noisy the acceleration measurement, but a reed that is too thin is difficult to machine and more easily deforms.
In the embodiment of the invention, the beryllium bronze is adopted to manufacture the elastic element, and because the beryllium bronze has the advantages of high hardness, elastic limit, fatigue limit, wear resistance and the like, the service life of the accelerometer can be prolonged.
Of course, the material, size and shape of the spring reed can be changed and replaced according to the requirement.
As a preferred embodiment, the detection light source is a narrow-linewidth fiber laser, which has low optical frequency noise and relative intensity noise, and is beneficial to reducing the measurement noise of the fiber accelerometer system; the narrow-linewidth optical fiber laser has low optical frequency noise and relative intensity noise, and can reduce measurement noise when being applied to a measurement system. In addition, other detection light sources can be selected according to requirements.
As a preferred embodiment, the optical module is a fiber circulator, which has the advantages of large return loss and low transmission loss, and is beneficial to reducing the measurement noise of the fiber accelerometer system; the optical module has the functions of: the laser emitted by the laser is input into the fiber accelerometer, and then the optical signal reflected by the fiber accelerometer is input into the photoelectric detector, in common fiber devices, the fiber circulator and the fiber coupler can realize the functions, but the fiber circulator has large return loss and low transmission loss, and can reduce the measurement noise of the fiber accelerometer system. In addition, other waveguide structures with the function of a fiber circulator or other optical structures can be used for replacement according to requirements.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A fiber optic accelerometer probe of symmetric dual-reed support structure, comprising: the device comprises an optical fiber head (1), an optical fiber clamp (2), a reflector (3), an integrated shell (5), a first elastic spring (8a), a second elastic spring (8b), a first mass block (9a), a central mass block (10), a second mass block (9b) and a base ring (13);
the optical fiber head (1) is fixed on the optical fiber clamp (2), and the optical fiber end face of the optical fiber head (1) and the reflector (3) form a Fabry-Perot cavity interference cavity; the initial cavity length of the Fabry-Perot cavity interference cavity is adjustable;
the first mass (9a) and the second mass (9b) are fixed symmetrically on either side of the central mass (10); the center of the first elastic spring plate (8a) is fixed on the first mass block (9a), and the center of the second elastic spring plate (8b) is fixed on the second mass block (9 b); the edge of the first elastic spring leaf (8a) is connected with the base ring (13), and the edge of the second elastic spring leaf (8b) is connected with the base ring (13);
the integrated shell (5) is connected with the base ring (13) and is used for sealing a spring oscillator structure consisting of a first elastic spring leaf (8a), a second elastic spring leaf (8b), a first mass block (9a), a central mass block (10) and a second mass block (9 b).
2. A fibre-optic accelerometer probe according to claim 1, further comprising: a first reed inner clamping plate (6a), a second reed inner clamping plate (6b), a first reed outer clamping plate (7a) and a second reed outer clamping plate (7 b);
the center of the first spring reed (8a) is fixed on the first mass block (9a) through the first reed inner clamping plate (6a), and the center of the second spring reed (8b) is fixed on the second mass block (9b) through the second reed inner clamping plate (6 b);
the edge of the first elastic reed (8a) is connected with the base ring (13) through the first reed outer clamping plate (7a), and the edge of the second elastic reed (8b) is connected with the base ring (13) through the second reed outer clamping plate (7 b).
3. A fibre-optic accelerometer probe according to claim 1 or 2, further comprising: a first boss (4a) and a second boss (4b),
the first boss (4a) is fixed on the first mass block (9a), and the second boss (4b) is fixed on the first boss (4 a); the reflector (3) is fixed on the plane of the first boss (4a) and the second boss (4 b).
4. A fibre-optic accelerometer probe according to any of claims 1-3, wherein the fibre clamp (2) is provided with an external thread and the integrated housing (5) is provided with an internal thread, wherein the initial cavity length of the fabry-perot cavity interference cavity is adjustable by screwing the fibre clamp (2) into the integrated housing (5) such that the distance between the fibre tip (1) and the mirror (3) is adjustable.
5. A fibre-optic accelerometer probe according to any of claims 1-4, wherein the optical fibre head (1) is a fibre-optic jumper plug, the fibre-optic end face of the optical fibre head (1) is polished by micro-sphere lapping, and the cavity length of the Fabry-Perot cavity interference cavity is 900 μm to 2000 μm.
6. A fibre-optic accelerometer probe according to any of claims 1-5, characterized in that the first spring reed (8a) and the second spring reed (8b) are shaped as a circular structure of two turns of a six-ring notch and have a thickness of 80 μm to 120 μm.
7. A fibre-optic accelerometer probe according to any of claims 1-6, characterized in that the mirror (3) is coated with a thin film material having a reflectivity of 0.04-1.
8. A fibre-optic accelerometer probe according to any of claims 1-7, further comprising: first balancing weight (11a) and second balancing weight (11b), first balancing weight (11a) is fixed on second quality piece (9b), second balancing weight (11b) is fixed on first balancing weight (11a), first balancing weight (11a) with second balancing weight (11b) are used for matching the weight of first boss (4a), second boss (4b) and speculum (3), make the flagging volume of fiber accelerometer probe both sides unanimous.
9. The optical fiber accelerometer system with the double-reed symmetrical supporting structure is characterized by comprising an optical fiber accelerometer probe (15), a detection light source (16), an optical module (17), a photoelectric detection module (18) and a signal acquisition system (19);
the fibre-optic accelerometer probe (15) being a fibre-optic accelerometer probe according to any of claims 1-8;
the optical module (17) comprises a first port, a second port and a third port, the first port is connected with a detection light source (16), the second port is connected with the fiber accelerometer probe (15), the third port is connected with a photoelectric detection module (18), the input light of the first port is output through the second port, and the input light of the second port is output through the third port;
the fiber-optic accelerometer probe (15) is used for converting an acceleration signal into an optical signal;
the detection light source (16) is used for providing laser required by the system;
the optical module (17) is used for inputting laser to the fiber-optic accelerometer probe (15) and guiding an optical signal of the fiber-optic accelerometer probe (15) into the photoelectric detection module (18);
the photoelectric detection module (18) is used for converting an optical signal of the fiber accelerometer probe (15) into an electrical signal;
and the signal acquisition system (19) is used for acquiring and processing the electrical signals to obtain acceleration signals.
10. A fibre-optic accelerometer system according to claim 9, wherein the detection light source (16) is a narrow-linewidth fibre laser and the optical module (17) is a fibre circulator.
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