CN205246695U - Fiber grating acceleration sensor based on optic fibre cantilever beam - Google Patents
Fiber grating acceleration sensor based on optic fibre cantilever beam Download PDFInfo
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- CN205246695U CN205246695U CN201521088800.XU CN201521088800U CN205246695U CN 205246695 U CN205246695 U CN 205246695U CN 201521088800 U CN201521088800 U CN 201521088800U CN 205246695 U CN205246695 U CN 205246695U
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- acceleration sensor
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Abstract
The utility model discloses a fiber grating acceleration sensor based on optic fibre cantilever beam belongs to optical fiber sensing technical field. Its major structure comprises quality piece 1, optic fibre cantilever beam 2, base 3. Wherein, 1 conduct oscillator of quality piece, the appearance is the cylinder, fixes on the optic fibre top. Optic fibre cantilever beam 2 by five diameters and material homogeneous phase with optic fibre constitutes, its cross section becomes two time last 3 two rows fifth ring shape ranges to the grating is write to an optic fibre in the centre. Base 3 is the metab, plays the effect of fixed fiber cantilever beam. Because fiber grating is in on horizontal neutral layer, and skew fore -and -aft neutral layer, therefore optic fibre prague wavelength only has the response to fore -and -aft vibration. The utility model discloses simple structure, sensitivity is high, transversely suppresses the relative altitude, and easy preparation has higher using value.
Description
Technical field
The utility model relates to technical field of optical fiber sensing, is specifically related to a kind of miniaturization acceleration based on fiber gratingSensor. In order to make sensor construction more brief effectively, improve frequency response ability, promote long-term reliability, reduce size, this realityBy new design a kind of optical fibre grating acceleration sensor based on many optical fiber structures cantilever beam, cantilever beam is also by optical fiberItself forms.
Background technology
Vibration measurement is the problem that engineering technological is paid attention to test always, for Aero-Space, dynamic power machine, traffic fortuneDefeated, ordnance weapons, energy industry, civil construction, electronics industry, environmental protection etc. are particularly important. Vibration directly affects machineThe operation stability of (or structure), security, the comfortableness of human body sensory, directly affects validity and the accuracy of production.According to the difference of measured parameter, testing sensor can be divided into displacement meter, speedometer, accelerometer, power sensor kind, andWherein accelerometer is the Primary Component of measuring dynamic characteristic. High-quality tester, equipment and modern test sideMethod is that optical fiber acceleration transducer is the one from last century, the eighties grew up along with the needs of producing grow upNovel sensor than electronic acceleration sensor, has obvious advantage under multimetering and certain applications background.Under the effort of researcher at home and abroad, there are numerous dissimilar optical fiber acceleration transducers in recent ten years,General principle, can be divided into intensity modulation type, phase modulation-type, bandwidth modulation type and wavelength-modulated type etc., wherein bandwidthModulation is also to belong to wavelength-modulated one class in essence, and different is the reflection peak bandwidth that its degree of will speed up physical quantity is converted to gratingInstead of the drift value of centre wavelength. Except these basic classification, also there is the light of the new constructions such as laser type fiberFine accelerometer. Aspect practical engineering application, also there are some companies to release comparatively practical product sensor, as for heightThe three-component fibre optic accelerometer orthogonal array system of exploring under super pressure-high temperature oil well, the three-dimensional based on Michelson interferometerFibre optic accelerometer bank base array system etc. In order to make sensor construction more brief effectively, improve frequency response ability, promote long-termReliability, reduces size, and the utility model has designed a kind of optical fibre grating acceleration sensing based on many optical fiber structures cantilever beamDevice, cantilever beam is to be also made up of optical fiber itself.
Although the structure of acceleration transducer is varied, with regard to its general principle, be mainly to transport with newton secondMoving law (law of inertia) is as theoretical foundation. In the ideal case, each sensing probe is exactly the mass inertia of a standardSystem, utilizes the forced vibration characteristic of system to carry out vibration measurement. On the whole, the optical fiber based on class cantilever beam structures acceleratesDegree sensor is studied one type comparatively widely, and it has simple in structure, high all the other species structure institutes of reliabilityIncomparable advantage. At present, known most optical fibre grating acceleration sensor is all based on various types of elasticityGirder construction, as the non-uniform beam of spring steel material, diplopore beam, bow beam, L shaped beam etc., to realize enhanced sensitivity, to improve Hz-KHzEffect. But the introducing of complex mechanism has inevitably increased size and the weight of sensor, has increased to a certain extent biographyThe fault rate of sensor, and the bonding long-time stability of the glue of optical fiber and other materials are not high. In order to make sensor construction moreBrief effectively raising frequency response ability, promotes long-term reliability, reduces size, and the utility model has designed a kind of based on many optical fiberThe optical fibre grating acceleration sensor of structure cantilever beam, cantilever beam is to be also made up of optical fiber itself.
Summary of the invention
In order to make sensor construction more brief effectively, improve frequency response ability, promote long-term reliability, reduce size, thisUtility model has designed a kind of optical fibre grating acceleration sensor based on many optical fiber structures cantilever beam, and cantilever beam is also by lightFine formation own.
The utility model solves the concrete technical scheme that its technical problem adopts: a kind of undersized high frequency sound abilityOptical fibre grating acceleration sensor, this agent structure is made up of mass, optic fibre cantilev and pedestal.
Described mass adopts the macromolecular material of durability to make, and as oscillator, its profile is cylinder, interior poroseHole, can insert optic fibre cantilev fixing.
Described optic fibre cantilev by five diameters and material all identical optical fiber form, its cross section become upper two times three liangRow's five rings shape is arranged, and is respectively the first optical fiber, the second optical fiber, the 3rd optical fiber, the 4th optical fiber and the 5th optical fiber; Between optical fiberBy adhesive strong bond together; The first optical fiber, the second optical fiber, the 3rd optical fiber and the 5th optical fiber are common single mode or multimodeOptical fiber, mainly plays a supporting role; The 4th optical fiber is single-mode fiber, has inscribed grating on it, as one of optic fibre cantilevDivide and play the effect of sense accelerations.
Described pedestal is made up of ordinary metallic material, is used to optic fibre cantilev that fixing point is provided, and it can be anyShape.
In such scheme, the length of described the first optical fiber, the second optical fiber, the 3rd optical fiber and the 5th optical fiber is only massA bit of between pedestal, the 4th optical fiber is actual useful sensor fibre, is connected on the tail optical fiber of sensor.
Preferably, the grid region length of described fiber grating is less than 5 millimeters.
Preferably, the position in next-door neighbour's pedestal when mounted of the grating on the 4th described optical fiber.
Preferably, between the five optical fibers of described optic fibre cantilev, connect by high strength glass is gluing, or other is specialBonding in the adhesive that quartz glass is bonding.
Preferably, the end surface grinding of described the 4th optical fiber that contains fiber grating has a certain degree, to reduce end faceThe interference of reverberation to demodulating system.
The beneficial effects of the utility model are.
1, adopt the cantilever beam of all optical fibre structure as spring beam, fiber grating also, for a part for composition cantilever beam, hasThe physical dimension that effect reduces.
2, cantilever beam is silica glass material of the same race, and characteristic is single, adopts the significantly length of lift structure of special adhesivePhase stability.
3, cross section becomes the five rings shape of two rows to arrange, and sensing grating mediates on the optical fiber of a ring, therefore canTo obtain higher response sensitivity in the situation that ensureing high laterally rejection ratio.
Brief description of the drawings
Fig. 1 is the side view of acceleration transducer agent structure schematic diagram described in the utility model.
Fig. 2 is the oblique view (not containing pedestal 3) of acceleration transducer agent structure schematic diagram described in the utility model.
Fig. 3 be optic fibre cantilev 2 in acceleration transducer agent structure schematic diagram described in the utility model cross section justView.
Detailed description of the invention
Below in conjunction with accompanying drawing, detailed description of the invention of the present utility model is described further.
Shown in Figure 1, acceleration transducer main body described in the utility model is by mass 1, optic fibre cantilev 2, pedestal 3Composition.
Shown in Figure 3, described optic fibre cantilev 2 is by the first optical fiber 21, the second optical fiber 22, the 3rd optical fiber 23, the 4th lightFibre 24 and the 5th optical fiber 25 form.
The 4th described optical fiber 24 is single-mode fiber, has inscribed grating on it, is acceleration perception device.
Residing the 4th optical fiber 24 of described fiber grating is positioned on the X-axis neutral line of optic fibre cantilev 2 structures, therefore rightThe bend-insensitive of X-direction.
The Y-axis neutral line of residing the 4th optical fiber 24 stray fiber cantilever beam 2 structures of described fiber grating, therefore to YAxial bending responsive, i.e. the bending of Y direction can cause the drift of grating wavelength.
Therefore, the vibration measurement direction of described acceleration transducer is Y-direction, and has high laterally rejection ratio.
The manufacturing process of described acceleration transducer is.
1, intercept four sections of common single modes or the multimode fibre of certain length, remove coat, end face is cut flat.
2, get single mode the 4th optical fiber 24 that contains grating, grating front portion stays certain length optical fiber to block, and ensures the assembling timeThe position of grid is near stiff end.
3, the 4th optical fiber 24 is removed the coat of equal length, the angle that end face rubbing down is certain.
4, the first optical fiber 21, the second optical fiber 22, the 3rd optical fiber 23, the 4th optical fiber 24 and the 5th optical fiber 25 are arranged in to upper twoLower three liang of rows' five rings shape, makes the 4th optical fiber 24 in second row centre position, and makes five optical fibers end face.
5,, by the bonding optical fiber of special adhesive, after solidifying, form optic fibre cantilev 2.
6, mass 1 is fixed on to optic fibre cantilev 2 tops by adhesive, and total is bonded on pedestal 3,Complete making.
In the time of practical application, described acceleration transducer agent structure outside also needs through packed by metal casing and tail optical fiber lightCable encapsulation.
Claims (6)
1. the optical fibre grating acceleration sensor based on optic fibre cantilev, comprises mass (1), optic fibre cantilev (2), baseSeat (3), is characterized in that, described mass (1), as oscillator, is arranged on cantilever beam top; Described optic fibre cantilev (2)Formed by optical fiber completely, and the optical fiber of having inscribed grating is a part as cantilever beam; Described pedestal (3) providesThe fixing point of optic fibre cantilev.
2. the optical fibre grating acceleration sensor based on optic fibre cantilev according to claim 1, is characterized in that: describedMass (1) is made up of the macromolecular material of durability, and profile is cylinder.
3. the optical fibre grating acceleration sensor based on optic fibre cantilev according to claim 1, is characterized in that: describedOptic fibre cantilev (2) by five diameters and material all identical optical fiber form, be respectively the first optical fiber (21), the second optical fiber(22), the 3rd optical fiber (23), the 4th optical fiber (24) and the 5th optical fiber (25); Its cross section becomes upper two times three one-tenth two rows' five rings shapeShape is arranged, and between optical fiber, passes through adhesive strong bond together.
4. the optical fibre grating acceleration sensor based on optic fibre cantilev according to claim 1, is characterized in that: describedOn the 4th optical fiber (24) of optic fibre cantilev (2), be carved with grating, other four optical fiber are single-mode fiber of the same race or multimode fibre.
5. the optical fibre grating acceleration sensor based on optic fibre cantilev according to claim 1, is characterized in that: describedGrating on the 4th optical fiber (24), its grid region length is less than 5 millimeters, and install time in next-door neighbour pedestal (3) position.
6. the optical fibre grating acceleration sensor based on optic fibre cantilev according to claim 1, is characterized in that: describedThe end surface grinding of the 4th optical fiber (24) is angled.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521088800.XU CN205246695U (en) | 2015-12-24 | 2015-12-24 | Fiber grating acceleration sensor based on optic fibre cantilever beam |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201521088800.XU CN205246695U (en) | 2015-12-24 | 2015-12-24 | Fiber grating acceleration sensor based on optic fibre cantilever beam |
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| CN205246695U true CN205246695U (en) | 2016-05-18 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20180081347A (en) * | 2017-01-06 | 2018-07-16 | 서울과학기술대학교 산학협력단 | Optical fiber sensor system including optical fiber sensor module of cantilever beam structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20180081347A (en) * | 2017-01-06 | 2018-07-16 | 서울과학기술대학교 산학협력단 | Optical fiber sensor system including optical fiber sensor module of cantilever beam structure |
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