CN100417962C - Linear responsive optical fiber, optical grating temperature test system capable of collecting and demodulating signal - Google Patents
Linear responsive optical fiber, optical grating temperature test system capable of collecting and demodulating signal Download PDFInfo
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- CN100417962C CN100417962C CNB2006100155807A CN200610015580A CN100417962C CN 100417962 C CN100417962 C CN 100417962C CN B2006100155807 A CNB2006100155807 A CN B2006100155807A CN 200610015580 A CN200610015580 A CN 200610015580A CN 100417962 C CN100417962 C CN 100417962C
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- optical fiber
- fiber grating
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- responsive optical
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Abstract
A temperature detection system of linear response optical fiber grating with collection and modulation signal is prepared as entering output light of light coupler into divider through photoelectric diode and series connection of amplifier as well as another output light of light coupler into input end of light circulator, connecting output end of light circulator to said grating used as sensing head and entering another output end of light circulator into dividing through said diode and amplifier, setting center wavelength of laser to be the same as that of said grating and using 139nm argon ion laser as ultraviolet laser being used to prepare linear response optical fiber grating.
Description
Technical field
The present invention 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, greatly reduce the cost of optical fiber grating sensor demodulating system and the linear responsive optical fiber grating system for detecting temperature with collection and restituted signal of complexity.
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 matters to be solved by this invention is, a kind of linear responsive optical fiber grating of only using is provided, can realize that sensing can realize demodulation again, greatly reduce the cost of optical fiber grating sensor demodulating system and the linear responsive optical fiber grating system for detecting temperature with collection and restituted signal of complexity.
The technical solution adopted in the present invention is: a kind of linear responsive optical fiber grating system for detecting temperature with collection and restituted signal includes laser instrument; The photo-coupler that is connected with laser instrument; One tunnel output light of photo-coupler enters divider by first photodiode with connecting of first 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 second photodiode with connecting of second 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.
Linear responsive optical fiber grating system for detecting temperature with collection and restituted signal of the present invention, 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 linear responsive optical fiber grating system for detecting temperature of restituted signal 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 invention;
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 the linear responsive optical fiber grating system for detecting temperature with collection and restituted signal of the present invention is made a detailed description.
As shown in Figure 1, have the linear responsive optical fiber grating system for detecting temperature of collection and restituted signal, 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 first photodiode 14 with connecting of first 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 second photodiode 11 with connecting of second amplifier 12.That is, the light signal that second photodiode 11 collects linear responsive optical fiber grating 10 becomes electric signal and delivers to second amplifier 12, and the electric signal that amplifies through second 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: β Δ T=Δ P/P by the relation of variation of light intensity and temperature.
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 invention, be not that the present invention is done any pro forma restriction, every foundation technical spirit of the present invention is done any simple modification, equivalent variations and modification to above embodiment, all belongs in the scope of technical solution of the present invention.
Claims (3)
1. the linear responsive optical fiber grating system for detecting temperature with collection and restituted signal 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 first photodiode (14) with connecting of first 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 second photodiode (11) with connecting of second amplifier (12).
2. the linear responsive optical fiber grating system for detecting temperature with collection and restituted signal according to claim 1 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. the linear responsive optical fiber grating system for detecting temperature with collection and restituted signal according to claim 1, 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 |
|---|---|---|---|
| CNB2006100155807A CN100417962C (en) | 2006-09-04 | 2006-09-04 | Linear responsive optical fiber, optical grating temperature test system capable of collecting and demodulating signal |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100155807A CN100417962C (en) | 2006-09-04 | 2006-09-04 | Linear responsive optical fiber, optical grating temperature test system capable of collecting and demodulating signal |
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| Publication Number | Publication Date |
|---|---|
| CN1916676A CN1916676A (en) | 2007-02-21 |
| CN100417962C true CN100417962C (en) | 2008-09-10 |
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| CN112097806B (en) * | 2020-09-22 | 2021-09-24 | 北京航空航天大学 | Signal-noise separation method for congruent weak grating reflected signals |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1363828A (en) * | 2002-02-08 | 2002-08-14 | 武汉理工大学 | Temp monitoring and alarming system with identity optical fibre raster |
| US20030007732A1 (en) * | 2001-06-29 | 2003-01-09 | Erlend Ronnekleiv | FBG production system |
| CN2760526Y (en) * | 2004-12-10 | 2006-02-22 | 淄博思科电子技术开发有限公司 | Distributed optical fibre raster temperature detecting system |
| CN200962060Y (en) * | 2006-09-04 | 2007-10-17 | 天津爱天光电子科技有限公司 | Linear response optical fiber grating temperature detection device with the collection and demodulation function |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030007732A1 (en) * | 2001-06-29 | 2003-01-09 | Erlend Ronnekleiv | FBG production system |
| CN1363828A (en) * | 2002-02-08 | 2002-08-14 | 武汉理工大学 | Temp monitoring and alarming system with identity optical fibre raster |
| CN2760526Y (en) * | 2004-12-10 | 2006-02-22 | 淄博思科电子技术开发有限公司 | Distributed optical fibre raster temperature detecting system |
| CN200962060Y (en) * | 2006-09-04 | 2007-10-17 | 天津爱天光电子科技有限公司 | Linear response optical fiber grating temperature detection device with the collection and demodulation function |
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