CN106053882A - Double-end solid strut beam type fiber acceleration sensor - Google Patents
Double-end solid strut beam type fiber acceleration sensor Download PDFInfo
- Publication number
- CN106053882A CN106053882A CN201610674186.8A CN201610674186A CN106053882A CN 106053882 A CN106053882 A CN 106053882A CN 201610674186 A CN201610674186 A CN 201610674186A CN 106053882 A CN106053882 A CN 106053882A
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- China
- Prior art keywords
- elastic sheet
- optical fiber
- acceleration transducer
- mass
- bonders
- Prior art date
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P15/00—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration
- G01P15/02—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses
- G01P15/08—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values
- G01P15/093—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values by photoelectric pick-up
-
- 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
Abstract
The invention discloses a double-end solid strut beam type fiber acceleration sensor, and the acceleration sensor comprises a 2*2 coupler, an elastic thin plate, a solid strut beam frame, a supporting rod, two single-mode fibers, two mass blocks, and two Faraday rotation mirrors. The elastic thin plate is disposed between the two mass blocks, and the supporting rod passes through the center of the elastic thin plate. Two ends of the supporting rod are respectively in fixed connection with the two mass blocks. The two single-mode fibers are respectively shaped like a runway and are fixed on the upper and lower surfaces of the elastic thin plate. The solid strut beam frame comprises a bottom plate and two side plates. The two side plates are vertically fixed at two sides of the bottom plate. Two ends of the elastic thin plate are respectively fixed on inner wall of the side plates of the solid strut beam frame. The lower mass block is located above the bottom plate of the solid strut beam frame. One end of each single-mode fiber is connected with the input end of the 2*2 coupler, and the other end of each single-mode fiber is connected with the corresponding Faraday rotation mirror. The acceleration sensor is mainly used for the fields of underground oil gas exploration, building defect detection and earthquake early warning.
Description
Technical field
The invention belongs to fiber optic sensor technology, be specifically related to a kind of two-end fixed beam formula optical fiber acceleration transducer.
Background technology
Fibre Optical Sensor is developed so far the history of the nearlyest 30 years, according to the difference of sensing principle, and substantial amounts of technical scheme and should
Also it is exploited out with field, some of which commercialization.Along with the development of Modern Transducer Technology, many new thinkings are carried
Go out and attempt.Such as in Industry Control, many employing light close coupled type structures or Fabry-Perot formula structure measurement temperature, acceleration
The parameters such as degree, pressure, displacement；In military affairs, for adapting to the needs of the high-tech meanss of warfare such as the most antisubmarine, guided missile, based on
The optical fibre gyro of Sagnac effect is applied in inertial navigation and gesture stability；At building, aerospace field, based on optical fiber
Intellectual material and the structure of intelligence of sensing technology are also widely used, just can be real in transient assemblies by being imbedded by sensing element
Time monitoring system duty, by necessary control and regulation thus ensure the optimum Working of system.So optical fiber
Sensor applies the every field in life with the superiority of its uniqueness.
For common phase modulation-type optical fiber acceleration transducer, great majority use flexible sheet or transition cylinder conduct
Conversion medium, is applied to the strain that acceleration produces on sensor fibre, thus causes the phase place of light in sensor fibre to change, should
Class sensor accuracy of detection is high, and dynamic range is big, is suitable for high-performance acceleration sensing field.Common structure has Mach-Zehnder
That type, Michelson's interferometer type, Sagnac interferometer type.Wherein Mach-Zender sensor probe design difficulty is big, unfavorable
In the design requirement of miniaturization, and the isolation of reference arm is also insoluble problem, but Michelson's interferometer type is permissible
Well solve above-mentioned deficiency, so Michelson's interferometer type is also that phase modulation-type optical fiber acceleration transducer is most-often used
Structure.
But meanwhile, the development of Fibre Optical Sensor there is also the following problem:
(1) Fibre Optical Sensor is limited by processing technology and device development, not yet forms large-scale production scale.
(2) high-performance, highly reliable Fibre Optical Sensor are the highest in cost of manufacture, it is impossible to by institute in most of engineerings
Application, needs to improve reduction cost energetically.
(3) due to sensor fibre, there is high sensitivity, therefore there is also the problem easily affected by external interference, to quilt
The enhanced sensitivity measured and the denoising to noise are all that Fibre Optical Sensor develops the subject matter faced.
(4) Fibre Optical Sensor signal and the matching problem imperfection of subsequent optical Electric signal processing, find simple accurate
Signal demodulating method most important.
(5) processing technology of novel Fibre Optical Sensor and the development of some passive devices are the most ripe.
(6) practical Fibre Optical Sensor is required to ensure long-term steady operation in adverse circumstances, so its encapsulation
Difficulty be also the major reason that many sensors can not be practical.
Summary of the invention
It is an object of the invention to provide a kind of two-end fixed beam formula optical fiber acceleration transducer, be mainly used in subterranean oil
The monitoring field of the exploration of gas, the detection of defect and earthquake pre-warning.
The technical solution realizing the object of the invention is: a kind of two-end fixed beam formula optical fiber acceleration transducer, including 2
× 2 bonders, elastic sheet, clamped beam framework, support bar, two single-mode fibers, two masses and two Faradays
Reflecting mirror, elastic sheet is arranged between two masses, and elastic sheet and two the mass threes interval that is parallel to each other sets
Putting, support bar passes elastic sheet center, and two ends are connected with two masses respectively, by support bar by elastic sheet and two
Mass holds together, and is disposed in clamped beam framework；Two single-mode fibers are fixed on elasticity in runway shape respectively
Two surfaces up and down of thin plate, clamped beam framework includes base plate and two blocks of side plates, and two blocks of side plates are vertically fixed on base plate both sides, bullet
Property thin plate two ends are separately fixed at the side plate inwall of clamped beam framework, and the mass of lower section is positioned on the base plate of clamped beam framework
Side, one end of two single-mode fibers all inputs with 2 × 2 bonders are connected, the other end respectively with Faraday reflecting mirror
Connect.
Described two-end fixed beam formula optical fiber acceleration transducer, also includes that annular groove, described annular groove are fixed on
The plate top surface of strutbeam framework, 2 × 2 bonders and two Faraday reflecting mirrors are each attached in annular groove, lower section
Mass is positioned at the top of annular groove end face.
Described annular groove sidewall has Wire channel in building, it is simple to pulled out by the outfan of 2 × 2 bonders.
Described elastic sheet includes that two pieces of thin plates are by gluing composition.
Described single-mode optical fiber length scope is 1m to 30m, and the length of two single-mode fibers is different.
Described mass is flat board, uses metal.
Compared with prior art, its remarkable advantage is the present invention:
(1) single-mode optical fiber length may select, and elastic sheet material may select, and elastic sheet size dimension may select, mass matter
Amount is optional, can produce the optical fiber acceleration transducer of any sensitivity and resonant frequency.
(2) volume of the present invention is little, simple in construction, it is easy to install, it is easy to accomplish large stretch of distributed sensor.
(3) dexterously single-mode fiber dish is attached to the upper and lower surface of elastic sheet, it is easy to improve and make three-dimension sensor.
(4) utilizing the change of interference signal to measure the information of vibration, when there being vibration signal, mass is made due to inertia
It is allowed to produce deformation with drive elastic sheet, thus causes single-mode optical fiber length and the change of refractive index that dish pastes, thus cause
The change of interference signal.
Accompanying drawing explanation
Fig. 1 is the front section view of two-end fixed beam formula optical fiber acceleration transducer of the present invention.
Fig. 2 is the elastic sheet coiling schematic diagram of two-end fixed beam formula optical fiber acceleration transducer of the present invention.
Fig. 3 is the top view of two-end fixed beam formula optical fiber acceleration transducer of the present invention.
Fig. 4 is the optical fibre reel structural representation of two-end fixed beam formula optical fiber acceleration transducer of the present invention.
Fig. 5 is the schematic diagram of two-end fixed beam formula optical fiber acceleration transducer of the present invention.
Fig. 6 is the single-mode fiber connection diagram of two-end fixed beam formula optical fiber acceleration transducer of the present invention.
Detailed description of the invention
The present invention will be further described with implementing step below in conjunction with the accompanying drawings.
The present invention is principle design structure based on Michelson's interferometer, is demodulated by the change of interference signal
The phase information of vibration.Its core concept is: when vibration occurs, mass 4 moves, and compression occurs in elastic sheet 5 upper and lower surface
And elongation so that there is compression and elongation in the length of single-mode fiber 1 thereon, laser produces phase contrast after two-arm, produces
Interfere, detect and analyze interference fringe information, obtaining measured signal acceleration or vibration parameters.
In conjunction with Fig. 1 to Fig. 6, a kind of two-end fixed beam formula optical fiber acceleration transducer, including 2 × 2 bonders 8, Thin Elastic
Plate 5, clamped beam framework 3, support bar 1, two masses 4 of 6, two single-mode fibers and two Faraday reflecting mirrors 7, elastic
Thin plate 5 is arranged between two masses 4, and elastic sheet 5 and two mass 4 threes are parallel to each other to be spaced and arrange, and support
Bar 6 is through elastic sheet 5 center, and two ends are connected, by support bar 6 by elastic sheet 5 and two matter with two masses 4 respectively
Gauge block 4 holds together, and is disposed in clamped beam framework 3；Two single-mode fibers 1 are fixed on elasticity in runway shape respectively
Two surfaces up and down of thin plate 5, clamped beam framework 3 includes base plate and two blocks of side plates, and two blocks of side plates are vertically fixed on base plate both sides,
Elastic sheet 5 two ends are separately fixed at the side plate inwall of clamped beam framework 3, and the mass 4 of lower section is positioned at the end of clamped beam framework 3
Above plate, one end of two single-mode fibers 1 all inputs with 2 × 2 bonders 8 are connected, the other end respectively with Faraday
Reflecting mirror 7 connects.
Also include that annular groove 9, described annular groove 9 are fixed on the plate top surface of clamped beam framework 3,2 × 2 bonders 8
Being each attached in annular groove 9 with two Faraday reflecting mirrors 7, the mass 4 of lower section is positioned at the upper of annular groove 9 end face
Side.
Described annular groove 9 sidewall has Wire channel in building, it is simple to pulled out by the outfan of 2 × 2 bonders 8.
Described elastic sheet 5 includes that two pieces of thin plates, by gluing composition, use carbon fiber board.
The described a diameter of 165um of single-mode fiber 1, length range is 1m to 30m.The length of two single-mode fibers 1 is different.
Described mass 4 is flat board, uses metal, and shape is any.
Embodiment 1
In conjunction with Fig. 1 to Fig. 6, a kind of two-end fixed beam formula optical fiber acceleration transducer, including 2 × 2 bonders 8, elastic sheet 5,
Clamped beam framework 3, support bar 1, two masses 4 of 6, two single-mode fibers and two Faraday reflecting mirrors 7.Elastic sheet
5 are arranged between two masses 4, and elastic sheet 5 and two mass 4 threes are parallel to each other to be spaced and arrange, elastic sheet 5
Center is provided with through hole, and support bar 6 is through elastic sheet 5 center and is secured to, and two ends are connected with two masses 4 respectively, logical
Cross support bar 6 elastic sheet 5 and two masses 4 to be held together, and be disposed in clamped beam framework 3.Two
Single-mode fiber 1 is attached to two surfaces up and down of elastic sheet 5 respectively in runway shape by ultra-violet curing lacquer disk(-sc), and clamped beam framework 3 wraps
Including base plate and two blocks of side plates, two blocks of side plates are vertically fixed on base plate both sides, and side plate inwall is arranged with projection, elastic sheet 5 liang
End is bolted in the projection of side plate inwall of clamped beam framework 3 respectively, and the mass 4 of lower section is positioned at clamped beam framework
Above the base plate of 3, one end of two single-mode fibers 1 all inputs with 2 × 2 bonders 8 are connected, the other end respectively with faraday
Optically-active reflecting mirror 7 connects.The outfan of 2 × 2 bonders 8 is connected with laser instrument 12 and detector 13 respectively.
Described two-end fixed beam formula optical fiber acceleration transducer, also includes that annular groove 9, described annular groove 9 are fixed on
The plate top surface of clamped beam framework 3,2 × 2 bonders 8 and two Faraday reflecting mirrors 7 are arranged in annular groove 9,
Filling by epoxide-resin glue envelope, wait gelling in about 2 hours solid, 2 × 2 bonders 8 and Faraday reflecting mirror 7 are just fixed on recessed
In groove 9, reduce the vibration effect of optical fiber.The mass 4 of lower section is positioned at the top of annular groove 9 end face.Described annular groove 9
It is integrated manufacture with clamped beam framework 3.
Described annular groove 9 sidewall has Wire channel in building, it is simple to pulled out by the outfan of 2 × 2 bonders 8.
Described elastic sheet 5 includes that two pieces of poly (methyl methacrylate) plates are formed by AB glue bond, a size of 80mm × 40mm ×
1mm。
The described a diameter of 165um of single-mode fiber 1, core diameter is 80um, the length of the single-mode fiber 1 of elastic sheet 5 upper surface
For 9m, length 11m of the single-mode fiber 1 of lower surface.
Described mass 4 is flat board, uses copper.
Described 2 × 2 bonders 8 are three-dB coupler.
Concrete manufacturing process is as follows:
Step 1, measuring two single-mode fibers 1 of 9m and 11m respectively, its fibre diameter is 165um, core diameter 80um.
Step 2, poly (methyl methacrylate) plate surface with alcohol washes totally, are fixed on fiber rotation dish 11.
Step 3, utilize the rotation of fiber rotation dish 11 that two single-mode fiber 1 compact disc respectively are attached to two pieces of lucites
On plate, single-mode fiber 1 is in runway shape, with reference to Fig. 2 and Fig. 4.
Step 4, single-mode fiber 1 are attached to poly (methyl methacrylate) plate surface by ultraviolet glue and ultraviolet light curing dish.
Step 5, two pieces are wound with different length single-mode fiber 1 poly (methyl methacrylate) plate AB glue glue and, formed elastic sheet
5。
Step 6, elastic sheet 5 are set in parallel between two masses 4, by support bar 6 by elastic sheet 5 and two
Mass 4 is fixed respectively, then reinforces in its junction with screw glue, and puts in clamped beam framework 3, and with solid by bolt
Fixed, with reference to Fig. 1.
Step 7, one end of two single-mode fibers 1 is connect a Faraday reflecting mirror 7 respectively, separately with optical fiber splicer
One end accesses 2 × 2 bonders 8 together.
Step 8, by Faraday reflecting mirror 7 and 2 × 2 bonder 8 connected by optical fiber coil direction be wound on annular recessed
In groove 9, and irrigating with epoxide-resin glue, wherein the ratio of epoxide-resin glue and firming agent is 25:1, makes Faraday reflect
Mirror 7 and 2 × 2 bonder 8 is fixed in groove 9, with reference to Fig. 1-6.
The principle of this optical fiber acceleration transducer is as follows: beam of laser is divided into equal strength two bundle through three-dB coupler 8, and two
Shu Guang respectively enters the two-arm that length is different, and the light through Faraday reflecting mirror 7 reflection meets coherent condition, therefore from coupling
Device light out will interfere.Putting on a vibration table by whole device, when not having vibration signal, interference fringe is stable
, and when there being microvibration signal, mass will produce upper and lower displacement due to effect of inertia, this will make elastic plate about 5
Surface produces compression and elongation, owing to sensor fibre is that dish is attached to elastic plate top and bottom, so the length of sensor fibre 1 is respectively
There will be compression and elongation, this can make the phase contrast of two-arm change, therefore interference fringe will change, and be analyzed by detection
Stripe information, demodulates its phase place, it is possible to record acceleration of vibration and vibration parameters, and schematic diagram is with reference to Fig. 5.
Claims (6)
1. a two-end fixed beam formula optical fiber acceleration transducer, it is characterised in that: include 2 × 2 bonders (8), elastic sheet
(5), clamped beam framework (3), support bar (6), two single-mode fibers (1), two masses (4) and two Faraday reflections
Mirror (7), elastic sheet (5) is arranged between two masses (4), and elastic sheet (5) and two mass (4) threes mutual
Parallel interval is arranged, and support bar (6) passes elastic sheet (5) center, and two ends are connected with two masses (4) respectively, by propping up
Elastic sheet (5) and two masses (4) are held together by strut (6), are disposed in clamped beam framework (3)；Two
Root single-mode fiber (1) is fixed on two surfaces up and down of elastic sheet (5) respectively in runway shape, and clamped beam framework (3) includes the end
Plate and two blocks of side plates, two blocks of side plates are vertically fixed on base plate both sides, and elastic sheet (5) two ends are separately fixed at clamped beam framework
(3) side plate inwall, the mass (4) of lower section is positioned at above the base plate of clamped beam framework (3), the one of two single-mode fibers (1)
End all inputs with 2 × 2 bonders (8) are connected, and the other end is connected with Faraday reflecting mirror (7) respectively.
Two-end fixed beam formula optical fiber acceleration transducer the most according to claim 1, it is characterised in that: also include that annular is recessed
Groove (9), described annular groove (9) is fixed on the plate top surface of clamped beam framework (3), 2 × 2 bonders (8) and two faraday
Optically-active reflecting mirror (7) is each attached in annular groove (9), and the mass (4) of lower section is positioned at the top of annular groove (9) end face.
Two-end fixed beam formula optical fiber acceleration transducer the most according to claim 2, it is characterised in that: described annular groove
(9) sidewall has Wire channel in building, it is simple to pulled out by the outfan of 2 × 2 bonders (8).
Two-end fixed beam formula optical fiber acceleration transducer the most according to claim 1, it is characterised in that: described elastic sheet
(5) include that two pieces of thin plates are by gluing composition.
Two-end fixed beam formula optical fiber acceleration transducer the most according to claim 1, it is characterised in that: described single-mode fiber
(1) length range is 1m to 30m, and the length of two single-mode fibers (1) is different.
Two-end fixed beam formula optical fiber acceleration transducer the most according to claim 1, it is characterised in that: described mass
(4) it is flat board, uses metal.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610674186.8A CN106053882A (en) | 2016-08-15 | 2016-08-15 | Double-end solid strut beam type fiber acceleration sensor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610674186.8A CN106053882A (en) | 2016-08-15 | 2016-08-15 | Double-end solid strut beam type fiber acceleration sensor |
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| CN201610674186.8A Pending CN106053882A (en) | 2016-08-15 | 2016-08-15 | Double-end solid strut beam type fiber acceleration sensor |
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Cited By (6)
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|---|---|---|---|---|
| CN108344880A (en) * | 2018-02-13 | 2018-07-31 | 北京大学 | A kind of long Michelson fibre optic accelerometer of unequal arm and its method for sensing |
| CN108548939A (en) * | 2018-03-26 | 2018-09-18 | 刘正勇 | Fibre optic accelerometer based on SAGNAC interferometers and vibration detection device |
| CN110018329A (en) * | 2019-04-12 | 2019-07-16 | 山东科技大学 | Bullet optical fiber acceleration sensor system |
| CN111308125A (en) * | 2020-02-24 | 2020-06-19 | 北京大学 | Acceleration detection method based on optical fiber Sagnac interferometer and acceleration meter |
| CN111323613A (en) * | 2020-03-21 | 2020-06-23 | 哈尔滨工程大学 | Vector optical fiber sensing probe based on optical fiber interferometer and underground vector accelerometer |
| CN111323614A (en) * | 2020-03-21 | 2020-06-23 | 哈尔滨工程大学 | Closed-loop disc type optical fiber accelerometer based on moving coil feedback mechanism |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108344880A (en) * | 2018-02-13 | 2018-07-31 | 北京大学 | A kind of long Michelson fibre optic accelerometer of unequal arm and its method for sensing |
| CN108344880B (en) * | 2018-02-13 | 2019-09-13 | 北京大学 | A kind of long Michelson fibre optic accelerometer of unequal arm and its method for sensing |
| CN108548939A (en) * | 2018-03-26 | 2018-09-18 | 刘正勇 | Fibre optic accelerometer based on SAGNAC interferometers and vibration detection device |
| CN110018329A (en) * | 2019-04-12 | 2019-07-16 | 山东科技大学 | Bullet optical fiber acceleration sensor system |
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| CN111308125A (en) * | 2020-02-24 | 2020-06-19 | 北京大学 | Acceleration detection method based on optical fiber Sagnac interferometer and acceleration meter |
| CN111323613A (en) * | 2020-03-21 | 2020-06-23 | 哈尔滨工程大学 | Vector optical fiber sensing probe based on optical fiber interferometer and underground vector accelerometer |
| CN111323614A (en) * | 2020-03-21 | 2020-06-23 | 哈尔滨工程大学 | Closed-loop disc type optical fiber accelerometer based on moving coil feedback mechanism |
| CN111323613B (en) * | 2020-03-21 | 2021-12-24 | 哈尔滨工程大学 | Vector optical fiber sensing probe based on optical fiber interferometer and underground vector accelerometer |
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Application publication date: 20161026 |