CN200962060Y - Linear response optical fiber grating temperature detection device with the collection and demodulation function - Google Patents
Linear response optical fiber grating temperature detection device with the collection and demodulation function Download PDFInfo
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- CN200962060Y CN200962060Y CN200620027223.8U CN200620027223U CN200962060Y CN 200962060 Y CN200962060 Y CN 200962060Y CN 200620027223 U CN200620027223 U CN 200620027223U CN 200962060 Y CN200962060 Y CN 200962060Y
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- fiber grating
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Abstract
The utility model discloses a linear response optical fiber grating temperature detection device with double function of acquisition and demodulation, which comprises an optical coupler connected with a laser device, one path of output light of the optical coupler enters a divider through a photodiode and an amplifier which are cascaded, and the other path of output light of the optical coupler is connected with the input terminals of a light circulator, one input terminal of the light circulator is connected with the linear response optical fiber grating which is used as a sensing head, and the other input terminal enters the divider through the photodiode and an amplifier which are cascaded. The central wave length of the laser device is the same as the central wave length of the linear response optical fiber grating. The ultraviolet laser for making the linear response optical fiber grating is either an argon laser of 139 nm or a quasi-molecular laser of 248 nm. No additional tunable filter is provided in the present utility model, further, the effect of the light source can be eliminated by the divider, thereby not only realizing sensing and also realizing demodulating, and greatly reducing the cost and complexity of the optical fiber grating temperature detection system.
Description
Technical field
The utility model relates to a kind of sensing technology.Particularly relate to a kind of linear responsive optical fiber grating of only using, can realize that sensing can realize demodulation again, the cost and the having of complexity that greatly reduce optical fiber grating sensor demodulating system are gathered and the bifunctional linear responsive optical fiber grating temperature-detecting device of demodulation.
Background technology
Optical fiber and fiber-optic grating sensor are the novel sensors of high speed development in recent years, optical fiber and fiber-optic grating sensor can collect the sensing of information and be transmitted in one, compare it with traditional sensor and have a lot of advantages: as explosion-proof, anti-electromagnetic interference (EMI), anticorrosive, anti-vibration, high temperature resistant, volume is little, and is in light weight, flexible, can under rugged surroundings, use especially.But, influenced their application because the demodulating system price of optical fiber and fiber-optic grating sensor is more expensive.
As electrical operation device temperature on-line monitoring is the important process of electric power netting safe running, because oxidation in weather, humid environment and the air, and construction or maintenance defective workmanship, make the contact resistance of loop-network switch cabinet device junction become big gradually, the joint surface heating, the vicious cycle that causes connector temperature to increase.Owing to can't carry out temperature monitoring, cause operational outfit fire or ground short circuit accident at last.This is that distribution management is badly in need of one of practical problems that solves at present.
Fibre Optical Sensor neutral line response fiber grating not only can be used for making sensing head, simultaneously also can be as the demodulation of transducing signal.Mostly the linearity sound fiber grating that uses in the market is chirp grating.By existing technology, there are two kinds of method for makings can make this grating, the one, of the warbling template exposure of band amplitude modulation(PAM), promptly make in the system of fiber grating, of the making that exposes of warbling accordingly template replacement Bragg grating template at the horizontal wrting method of common of.The 2nd, carry out the functions control exposure with two scanister, promptly to light-beam position, in these three parameters of template position and light-sensitive optical fibre position two carry out functions control and expose and carry out the making of grating.Replace the Bragg grating template need purchase the special template of warbling with the template of warbling, the operation wavelength of the linear responsive optical fiber grating of making, chirp rate all be subjected to the warbling restriction of template, if want in some service bands, to make any wavelength, any chirp rate, the chirp grating of response slope and bandwidth, the template of warbling that just must need many different indexs, linear responsive optical fiber grating just can be produced the linear responsive optical fiber grating of satisfying the demand, the price of the template of warbling is very expensive, and this brings very big difficulty to suitability for industrialized production.Carry out functions control exposure with two scanister, promptly to light-beam position, in these three parameters of template position and light-sensitive optical fibre position two carry out the expose method of the making of carrying out grating of functions control, the two scanning systems that need to make accurate control.
Disclosed as Chinese patent 02151734.7 is to adopt vibration amplitude mask plate that the incident parallel ultraviolet is carried out utilizing phase mask that light-sensitive optical fibre is carried out scan exposure after the Modulation and Amplitude Modulation, it is before UV-irradiation amplitude template, earlier ultraviolet light is expanded bundle with parallel beam expand device, the ultraviolet light that expands after restrainting carries out Modulation and Amplitude Modulation through vibration amplitude mask plate, with beam condensing unit compression ultraviolet light hot spot, by phase mask plate light-sensitive optical fibre is carried out scan exposure then again.
Chinese patent 02159585.2 is disclosed to be the parallel ultraviolet of vertical incidence amplitude grating diffraction, converges diffraction light with quartz glass then, converges diffraction light and by phase mask light-sensitive optical fibre is exposed.
Chinese patent CN02146019.1 is disclosed, and to be the rotation transfer table controlling excimer pulse laser simultaneously and fixing diaphragm with computing machine drive diaphragm by the function curve of prior design rotates light-sensitive optical fibre is exposed.
The problem that known technology exists: the one, instrument and equipment, the template of warbling of making fiber grating cost an arm and a leg; The 2nd, need strict corresponding anti-shock system, to guarantee the stability of mechanical azimuthal in the preparing grating process.Except the cost cost, more than disclosedly have technology to also have a common shortcoming: they can only realize the ladder digital simulation of required exposure function, the successional quality of analog function can make the generation of grating response function that in various degree error is arranged, the 3rd, complicated subsidiary condition are brought difficulty to employee's operation, be unfavorable for suitability for industrialized production, the 4th, the costliness of optical fiber grating regulating system is unfavorable for installing in the lower equipment of price.
Summary of the invention
Technical problem to be solved in the utility model is, a kind of linear responsive optical fiber grating of only using is provided, can realize that sensing can realize demodulation again, the cost and the having of complexity that greatly reduce optical fiber grating sensor demodulating system are gathered and the bifunctional linear responsive optical fiber grating temperature-detecting device of demodulation.
The technical scheme that the utility model adopted is: a kind of have gather and the bifunctional linear responsive optical fiber grating temperature-detecting device of demodulation, include laser instrument; The photo-coupler that is connected with laser instrument; One tunnel output light of photo-coupler enters divider by photodiode with connecting of amplifier, another road output light of photo-coupler connects the input end of optical circulator, first output terminal of optical circulator with link as the linear responsive optical fiber grating of sensing head, another output terminal enters divider by photodiode with connecting of amplifier.
The centre wavelength of described laser instrument is identical with the centre wavelength of linear responsive optical fiber grating.
Described linear responsive optical fiber grating is to be set gradually and constituted by ultraviolet laser, adjustable slit plate, mutually perpendicular post lens, phase mask, light-sensitive optical fibre, wherein, ultraviolet laser is a kind of in the excimer laser of the Argon ion laser of 139nm or 248nm.
Of the present utility model have gather and the bifunctional linear responsive optical fiber grating temperature-detecting device of demodulation, the apparatus structure of making linear responsive optical fiber grating does not simply need the expensive template of warbling, do not need strict shock-absorption, remove the adjustable slit plate and just can produce the ordinary optic fibre grating, the 4th, simple to operate, be suitable for suitability for industrialized production.Gather and the bifunctional linear responsive optical fiber grating temperature-detecting device of demodulation and have, adjustable filter is not set in addition, and the influence of light source is eliminated by divider.Can realize that sensing can realize demodulation again, greatly reduce the cost and the complexity of optical fiber, optical grating temperature test system.
Description of drawings
Fig. 1 is an one-piece construction synoptic diagram of the present utility model;
Fig. 2 is a structural representation of making the linear responsive optical fiber grating device;
Fig. 3 is the synoptic diagram of linear responsive optical fiber grating;
Fig. 4 is the temperature variant synoptic diagram of linear responsive optical fiber grating.
Wherein:
1: ultraviolet laser 2: slit plate
3: laser instrument 4,5: post lens
6: phase mask 7: light-sensitive optical fibre
8: photo-coupler 9: optical circulator
10: linear responsive optical fiber grating 11,14: photodiode
12,15: amplifier 13: divider
Embodiment
Below in conjunction with embodiment and accompanying drawing to of the present utility model have gather and the bifunctional linear responsive optical fiber grating temperature-detecting device of demodulation makes a detailed description.
As shown in Figure 1, have and gather and the bifunctional linear responsive optical fiber grating temperature-detecting device of demodulation, include Wavelength stabilized laser instrument 3; The photo-coupler 8 that is connected with laser instrument 3; One tunnel output light of photo-coupler 8 enters divider 13 by photodiode 14 with connecting of amplifier 15.That is, be input to the output of PC computing machine by divider 13.
Another road output light of photo-coupler 8 connects the input end of optical circulator 9, first output terminal of optical circulator 9 with link as the linear responsive optical fiber grating 10 of sensing head, the return signal that linear responsive optical fiber grating 10 is gathered is got back to optical circulator 9, and another output terminal of optical circulator 9 is sent the return signal of linear responsive optical fiber grating 10 collections into divider 13 by photodiode 11 with connecting of amplifier 12.That is, the light signal that photodiode 11 collects linear responsive optical fiber grating 10 becomes electric signal and delivers to amplifier 12, and the electric signal that amplifies through amplifier 12 enters divider 13.Wherein, the centre wavelength of described laser instrument 3 is identical with the centre wavelength of linear responsive optical fiber grating 10.
As shown in Figure 2, make the device of linear responsive optical fiber grating, include ultraviolet laser 1, its ultraviolet laser 1 can be the Argon ion laser of 139nm or the excimer laser of 248nm.The directional light that is sent 248 nanometers or 193 nanometers by ultraviolet laser 1 is by slit plate 2, the seam width d1 of slit plate 2 is adjustable, ultraviolet light by slit plate 2 pools square focus spot through two mutually perpendicular post lens 4,5, these two post lens 4,5 have identical performance index, and they are all perpendicular to the direction of ultraviolet light incident.The square focus spot that converges through two orthogonal post lens 4,5 exposes by 6 pairs of light-sensitive optical fibres 7 of phase mask again, thereby obtains linear responsive optical fiber grating 10.
As shown in Figure 4, solid line partly is to be T in temperature among the figure
0The time, the wavelength of laser instrument the A place, the intensity after linear responsive optical fiber grating 10 reflection is P
0, when ambient temperature changes, linear responsive optical fiber grating 10 will move, and dotted portion among the figure will be because laser instrument not with temperature change, will be changed into P by the light intensity that linear responsive optical fiber grating 10 reflects
1, can obtain light intensity by computer program calculating is P
1The time temperature T
1Promptly the relation according to Bragg grating reflection wavelength change amount and temperature can obtain variation of temperature amount formula: α Δ T=Δ λ
β/ λ
βOr can obtain variation of temperature amount formula by the relation of variation of light intensity and temperature; β Δ T=Δ P/P.
For by reliability and degree of accuracy, to remove light source and change the influence that causes, the light of flashlight and light source enters divider simultaneously and handles.
The above only is preferred embodiment of the present utility model, be not that the utility model is done any pro forma restriction, every foundation technical spirit of the present utility model is done any simple modification, equivalent variations and modification to above embodiment, all belongs in the scope of technical solutions of the utility model.
Claims (3)
1. one kind has collection and the bifunctional linear responsive optical fiber grating temperature-detecting device of demodulation, it is characterized in that, includes laser instrument (3); The photo-coupler (8) that is connected with laser instrument (3); One tunnel output light of photo-coupler (8) enters divider (13) by photodiode (14) with connecting of amplifier (15), another road output light of photo-coupler (8) connects the input end of optical circulator (9), first output terminal of optical circulator (9) with link as the linear responsive optical fiber grating (10) of sensing head, another output terminal enters divider (13) by photodiode (11) with connecting of amplifier (12).
2. according to claim 1 have gather and the bifunctional linear responsive optical fiber grating temperature-detecting device of demodulation, it is characterized in that the centre wavelength of described laser instrument (3) is identical with the centre wavelength of linear responsive optical fiber grating (10).
3. according to claim 1 have gather and the bifunctional linear responsive optical fiber grating temperature-detecting device of demodulation, it is characterized in that, described linear responsive optical fiber grating (10) is to set gradually formation by ultraviolet laser (1), adjustable slit plate (2), mutually perpendicular post lens (4,5), phase mask (6), light-sensitive optical fibre (7), wherein, ultraviolet laser (1) is a kind of in the excimer laser of the Argon ion laser of 139nm or 248nm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200620027223.8U CN200962060Y (en) | 2006-09-04 | 2006-09-04 | Linear response optical fiber grating temperature detection device with the collection and demodulation function |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200620027223.8U CN200962060Y (en) | 2006-09-04 | 2006-09-04 | Linear response optical fiber grating temperature detection device with the collection and demodulation function |
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| CN200962060Y true CN200962060Y (en) | 2007-10-17 |
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| CN200620027223.8U Expired - Lifetime CN200962060Y (en) | 2006-09-04 | 2006-09-04 | Linear response optical fiber grating temperature detection device with the collection and demodulation function |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100417962C (en) * | 2006-09-04 | 2008-09-10 | 天津爱天光电子科技有限公司 | Linear responsive optical fiber, optical grating temperature test system capable of collecting and demodulating signal |
-
2006
- 2006-09-04 CN CN200620027223.8U patent/CN200962060Y/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100417962C (en) * | 2006-09-04 | 2008-09-10 | 天津爱天光电子科技有限公司 | Linear responsive optical fiber, optical grating temperature test system capable of collecting and demodulating signal |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Effective date of abandoning: 20060904 |
|
| AV01 | Patent right actively abandoned |
Effective date of abandoning: 20060904 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting | ||
| DD01 | Delivery of document by public notice |
Addressee: Zhong Sheng Document name: Notification that Application Deemed not to be Proposed |