CN101915593A - Device for demodulating fiber bragg grating reflection wavelength by utilizing ASE light source light spectrum failing edge - Google Patents
Device for demodulating fiber bragg grating reflection wavelength by utilizing ASE light source light spectrum failing edge Download PDFInfo
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- CN101915593A CN101915593A CN 201010228498 CN201010228498A CN101915593A CN 101915593 A CN101915593 A CN 101915593A CN 201010228498 CN201010228498 CN 201010228498 CN 201010228498 A CN201010228498 A CN 201010228498A CN 101915593 A CN101915593 A CN 101915593A
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- intensity sensor
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Abstract
The invention discloses a device for demodulating fiber bragg grating reflection wavelength by utilizing an ASE light source light spectrum failing edge, belonging to the technical field of fiber sensing. The device comprises an ASE light source, a beam splitter, a light intensity sensor a, a light intensity sensor b, a 3dB coupler, a fiber bragg grating (FBG) and a computer, and is characterized in that the ASE light source is positioned in front of the beam splitter; the light intensity sensor a and the 3dB coupler are placed at the back of the beam splitter; the 3dB coupler is respectively connected with the light intensity sensor b and the FBG through light-guide fibers; the light intensity sensor a and the light intensity sensor b convert two respectively received paths of beam splitting lights into electrical signals; and the output ends thereof are respectively electrically connected on the computer through guide wires after being respectively connected with an A/D conversion device to carry out data calculation process on the output electrical signals through the computer. The device of the invention has low cost; and the detection method is convenient, simple and practical, can be widely applied to multiple fields of production and lives, such as local temperature detection, local strain detection and the like.
Description
(1) technical field
The present invention relates to a kind of device of the ASE of utilization light source light spectrum negative edge demodulating fiber bragg grating reflection wavelength, belong to technical field of optical fiber sensing.
(2) technical background
Can reflect this critical nature of light of specific wavelength according to fiber grating, fiber grating can the reflection different wave length under conditions such as different temperature, strain light, this character of utilizing fiber grating has been widely used in numerous areas in the productive life to fiber grating as sensor-based systems such as the temperature of sensor, strains.In optical fiber sensing system, the value of the wavelength of fiber grating reflected back need be passed through the certain method demodulation, and common demodulation method mostly relies on spectrometer, wavemeter etc. at present.See by the present market price, be applicable to that the spectrometer of optical fiber sensing system, wavemeter price do not wait to hundreds of thousands unit at several ten thousand yuan.The high price of optical fiber sensing system, the range of application and the place of optical fiber sensing system have been limited to a certain extent, having influenced the marketing of optical fiber sensing system and further develop, is that CN200710038145.0, denomination of invention promptly belong to these row for the patent of " high temperature fiber grating sensing system " as the number of applying for a patent.
(3) summary of the invention
In order to overcome the shortcomings and deficiencies that prior art exists, the present invention proposes a kind of device of the ASE of utilization light source light spectrum negative edge demodulating fiber bragg grating reflection wavelength, be intended to the effect of energy instead of optical spectrometer, wavemeter, thereby reduce the cost of optical fiber sensing system.
Technical scheme of the present invention is as follows:
A kind of device that utilizes ASE light source light spectrum negative edge demodulating fiber bragg grating reflection wavelength, comprise ASE light source, beam splitter, light intensity sensor a, light intensity sensor b, three-dB coupler, FBG, A/D conversion equipment and computing machine, it is characterized in that the ASE light source is positioned at before the beam splitter, the light that the ASE light source is sent by beam splitter is divided into two bundles; Light intensity sensor a and three-dB coupler are placed in the beam splitter back, transmit the two-beam that is divided by beam splitter respectively; Three-dB coupler is connected with FBG with light intensity sensor b respectively through light transmitting fiber, makes the light that incides FBG reflect and incide on the light intensity sensor b through it; The two-way beam splitting light that light intensity sensor a, b will be received separately converts electric signal to, and its output terminal is electrically connected on the computing machine through lead respectively after connecting the A/D conversion equipment separately, the electric signal of exporting is carried out data computation by computing machine handle.
Described ASE light source is meant the amplified spontaneous emission light source.Light source body partly is gain media Er-doped fiber and high performance pump laser.
Described FBG is the abbreviation of Fiber Bragg Grating, i.e. Fiber Bragg Grating FBG.
The wavelength coverage broad of ASE light source, spectral shape, power are comparatively stable, are used as the light source of optical fiber sensing system widely.The spectrum that utilizes the ASE light source is at negative edge (wavelength from 1558nm to 1565nm between), the relation that the power of light source at a certain wavelength place reduces gradually with the wavelength increase, we can reflect the variation of fiber grating reflected light centre wavelength indirectly according to the variable power of the light of fiber grating reflected back.And according to catoptrical variable power scope, we can reflect the variation range of fiber grating centre wavelength indirectly.
Specifically, ASE light source light spectrum shape, power are comparatively stable.Build a miniature fiber sensor-based system of forming by ASE light source, grating fibers, light intensity sensor, Computer Processing and display system.The wide range light that the ASE light source sends is divided into two bundles through beam splitter, a branch of light intensity sensor of directly injecting, another bundle is injected fiber grating through coupling mechanism, and fiber grating can reflect certain wavelengths, and the light that fiber grating is launched is back injected another light intensity sensor through coupling mechanism.The light intensity sensor that is used for native system all links to each other with computing machine, and the intensity signal of light intensity sensor can be by computer real-time acquisition and processing.
This demodulation method is used for fiber temperature sensing system, and before system installed, we were placed on fiber grating in the constant temperature oven, the centre wavelength power that the optical fiber optical grating reflection returns when determining alarm temperature and the ratio of ASE light source power.By the spectral signature of ASE light source and the temperature variant feature of fiber grating as can be known, when temperature raise, the centre wavelength of grating fibers can be to the drift of wavelength growing direction, thereby the beam intensity ratio of the light intensity of centre wavelength light and ASE light source can descend.We are installed in this system on the monitored object, according to the real time data of light intensity sensor, can draw out the real time data curve map of beam intensity ratio, when beam intensity ratio is lower than the warning beam intensity ratio that we preset, and alarm equipment alarm at this moment.
This demodulation method is used for sensing system of fiber strain, before system installs, we change according to the maximum stress that the survey object can bear, and determine the range of drift of wavelength, thus the wavelength power that definite fiber grating fires back and the ratio range of ASE light source power.We are installed in this system on the monitored object, according to the real time data of optical sensor, can draw out the real time data curve map of beam intensity ratio.Computer data sample frequency than higher speed is set, so just can shows the real time status of strain by the real time data curve map.In the real time data curve map scope of beam intensity ratio, when having exceeded the maximum changing range that we determine between system building, the strain that this expression testee has been subjected to exceeding its tolerance range.At this moment need us to check monitored object, get rid of potential safety hazard.
Utilize said apparatus, carry out temperature and strain measurement by the demodulation of fiber grating reflection wavelength, concrete steps are as follows:
1. device is connected, ASE light incides light intensity sensor a through beam splitter, and light intensity sensor a changes the light intensity signal that receives into electric signal, with the form output of current signal; Current signal is through A/D conversion equipment input computing machine, and by relevant software programs, the digital current signal magnitude that obtains the light intensity signal correspondence on computers is I
1ASE light is injected FBG through beam splitter, is injected into light intensity sensor b through the light of the specific wavelength of FBG reflection, and through light intensity sensor, A/D conversion equipment, by relevant software programs, the digital current signal magnitude of reading this road light on computers is I
2I
1, I
2Read real-time change by computer real-time;
2. when this device was used to monitor temperature information, before system installed, we were placed on FBG in the constant temperature oven, I when determining alarm temperature
2With I
1Ratio, be decided to be (I
2/ I
1)
Report to the policeBy the spectral signature of ASE light source and the temperature variant feature of FBG as can be known, when temperature raise, the centre wavelength of FBG can be to the drift of wavelength growing direction, thus I
2With I
1Ratio can descend; Pairing I during alarm temperature
2/ I
1, i.e. I
2/ I
1The permission minimum value; We are installed in this system on the monitored object, from the real time data that light intensity sensor obtains, draw out I according to computing machine
2/ I
1The real time data curve map, work as I
2/ I
1Be lower than the warning beam intensity ratio (I that we preset
2/ I
1)
Report to the policeThe time, alarm equipment alarm at this moment;
When this device is used to monitor strain information, before system installs, we change according to the maximum stress that the survey object can bear, determine the range of drift of wavelength, thereby the wavelength power that definite FBG fires back and the ratio range of ASE light source power, after light signal is converted to electric signal, determine I
2/ I
1Maximal value (I
2/ I
1)
Maximum, minimum value (I
2/ I
1)
MinimumWe are installed in this system on the monitored object, according to the real time data of light intensity sensor a, b, change electric signal into after, draw out current signal and compare I
2/ I
1The real time data curve map; Computer data sample frequency than higher speed is set, so just can shows the real time status of strain by the real time data curve map; Beam intensity ratio I in the real time data curve map
2/ I
1, less than (I
2/ I
1)
MinimumPerhaps greater than (I
2/ I
1)
MaximumThe time, the strain that this expression testee has been subjected to exceeding its tolerance range; At this moment need us to check monitored object, get rid of potential safety hazard;
3. when system was used to monitor in real time, by relevant software programs, computing machine was sent next current signal I to according to light intensity sensor a and light intensity sensor b
1And I
2, set up an I
2/ I
1The real time data curve map of t in time; Digital current signal I
1And I
2Numerical values recited by computer real-time acquisition, the frequency of collection is determined by computer program, as the I of computer acquisition to a certain moment
1And I
2Value the time, computing machine can calculate I simultaneously
2/ I
1Size, with I
2/ I
1Value fix at real time data curve map subscript, and with this value with warning I
2/ I
1Relatively, if the I that collects
2/ I
1When meeting the alert if of step described in 2., system sends warning message.
Because the spectral shape power of ASE light source has certain stability, when we different computer samplings is set, when handling frequency, this kind method can be used for detected temperatures, strain etc. widely.
Beneficial effect of the present invention can be learnt according to the concrete narration to above-mentioned technology, the optical fiber sensing system price that comprises demodulation modules such as spectrometer, wavemeter does not wait to hundreds of thousands unit at several ten thousand yuan, and the higher market of optical fiber sensing system that makes of price is subjected to certain restriction.Utilize the novel optical fiber sensor-based system of ASE light source light spectrum negative edge part demodulation that the price of sensor-based system is significantly descended and adopted.This mini-system can be widely used in the numerous areas of productive life, and for example local temperature detection, local train detection etc. play an important role for ensureing industrial safety production, daily life safety.
(4) description of drawings
Fig. 1 is the structural representation of apparatus of the present invention.
Wherein: 1, ASE light source, 2, beam splitter, 3, three-dB coupler, 4, FBG, 5, light intensity sensor a, 6, light intensity sensor b, 7, computing machine, 8, light transmitting fiber, 9, the A/D conversion equipment, 10, the A/D conversion equipment.
(5) embodiment
Below in conjunction with drawings and Examples the present invention is further specified, but be not limited thereto.
Embodiment 1:
As shown in Figure 1, comprise ASE light source 1, beam splitter 2, light intensity sensor a5, light intensity sensor b5, three-dB coupler 3, FBG4, A/D conversion equipment 9,10 and computing machine 7, it is characterized in that ASE light source 1 is positioned at before the beam splitter 2, the light that ASE light source 1 is sent by beam splitter 2 is divided into two bundles; Light intensity sensor a5 and three-dB coupler 3 are placed in beam splitter 2 back, transmit the two-beam that is divided by beam splitter 2 respectively; Three-dB coupler 3 is connected with FBG4 with light intensity sensor b6 respectively through light transmitting fiber 8, makes the light that incides FBG4 reflect and incide on the light intensity sensor b6 through it; The two-way beam splitting light that light intensity sensor a5, b6 will be received separately converts electric signal to, and its output terminal is electrically connected on the computing machine 7 through lead respectively after connecting A/D conversion equipment 9,10 separately, the electric signal of exporting is carried out data computation by computing machine handle.
Embodiment 2:
Utilize said apparatus, carry out temperature and strain measurement by the demodulation of fiber grating reflection wavelength, concrete steps are as follows:
1. device is connected, ASE light incides light intensity sensor a through beam splitter, and light intensity sensor a changes the light intensity signal that receives into electric signal, with the form output of current signal; Current signal is through A/D conversion equipment input computing machine, and by relevant software programs, the digital current signal magnitude that obtains the light intensity signal correspondence on computers is I
1ASE light is injected FBG through beam splitter, is injected into light intensity sensor b through the light of the specific wavelength of FBG reflection, and through light intensity sensor, A/D conversion equipment, by relevant software programs, the digital current signal magnitude of reading this road light on computers is I
2I
1, I
2Read real-time change by computer real-time;
2. when this device was used to monitor temperature information, before system installed, we were placed on FBG in the constant temperature oven, I when determining alarm temperature
2With I
1Ratio, be decided to be (I
2/ I
1)
Report to the policeBy the spectral signature of ASE light source and the temperature variant feature of FBG as can be known, when temperature raise, the centre wavelength of FBG can be to the drift of wavelength growing direction, thus I
2With I
1Ratio can descend; Pairing I during alarm temperature
2/ I
1, i.e. I
2/ I
1The permission minimum value; We are installed in this system on the monitored object, from the real time data that light intensity sensor obtains, draw out I according to computing machine
2/ I
1The real time data curve map, work as I
2/ I
1Be lower than the warning beam intensity ratio (I that we preset
2/ I
1)
Report to the policeThe time, alarm equipment alarm at this moment;
When this device is used to monitor strain information, before system installs, we change according to the maximum stress that the survey object can bear, determine the range of drift of wavelength, thereby the wavelength power that definite FBG fires back and the ratio range of ASE light source power, after light signal is converted to electric signal, determine I
2/ I
1Maximal value (I
2/ I
1)
Maximum, minimum value (I
2/ I
1)
MinimumWe are installed in this system on the monitored object, according to the real time data of light intensity sensor a, b, change electric signal into after, draw out current signal and compare I
2/ I
1The real time data curve map; Computer data sample frequency than higher speed is set, so just can shows the real time status of strain by the real time data curve map; Beam intensity ratio I in the real time data curve map
2/ I
1, less than (I
2/ I
1)
MinimumPerhaps greater than (I
2/ I
1)
MaximumThe time, the strain that this expression testee has been subjected to exceeding its tolerance range; At this moment need us to check monitored object, get rid of potential safety hazard.
3. when system was used to monitor in real time, by relevant software programs, computing machine was sent next current signal I to according to light intensity sensor a and light intensity sensor b
1And I
2, set up an I
2/ I
1The real time data curve map of t in time; Digital current signal I
1And I
2Numerical values recited by computer real-time acquisition, the frequency of collection is determined by computer program, as the I of computer acquisition to a certain moment
1And I
2Value the time, computing machine can calculate I simultaneously
2/ I
1Size, with I
2/ I
1Value fix at real time data curve map subscript, and with this value with warning I
2/ I
1Relatively, if the I that collects
2/ I
1When meeting the alert if of step described in 2., system sends warning message.
Claims (2)
1. device that utilizes ASE light source light spectrum negative edge demodulating fiber bragg grating reflection wavelength, comprise ASE light source, beam splitter, light intensity sensor a, light intensity sensor b, three-dB coupler, FBG, A/D conversion equipment and computing machine, it is characterized in that the ASE light source is positioned at before the beam splitter, the light that the ASE light source is sent by beam splitter is divided into two bundles; Light intensity sensor a and three-dB coupler are placed in the beam splitter back, transmit the two-beam that is divided by beam splitter respectively; Three-dB coupler is connected with FBG with light intensity sensor b respectively through light transmitting fiber, makes the light that incides FBG reflect and incide on the light intensity sensor b through it; The two-way beam splitting light that light intensity sensor a, b will be received separately converts electric signal to, and its output terminal is electrically connected on the computing machine through lead respectively after connecting the A/D conversion equipment separately, the electric signal of exporting is carried out data computation by computing machine handle.
2. a kind of device that utilizes ASE light source light spectrum negative edge demodulating fiber bragg grating reflection wavelength as claimed in claim 1 can be used in by this device and to carry out temperature and strain measurement.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010228498 CN101915593A (en) | 2010-07-16 | 2010-07-16 | Device for demodulating fiber bragg grating reflection wavelength by utilizing ASE light source light spectrum failing edge |
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| CN 201010228498 CN101915593A (en) | 2010-07-16 | 2010-07-16 | Device for demodulating fiber bragg grating reflection wavelength by utilizing ASE light source light spectrum failing edge |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103808267A (en) * | 2012-11-12 | 2014-05-21 | 中国航空工业第六一八研究所 | Spectrograph-based optical displacement sensor signal demodulation method |
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| US20070058897A1 (en) * | 2003-09-08 | 2007-03-15 | Yong Jae C | Fiber bragg grating sensor system |
| CN101169334A (en) * | 2007-11-21 | 2008-04-30 | 北京理工大学 | Intensity modulation type optical fiber sensor multiplexing method |
| CN101226051A (en) * | 2008-01-30 | 2008-07-23 | 哈尔滨师范大学 | Temperature self-compensation optical fiber/optical grating dynamic strain measurement method and system |
| CN101246026A (en) * | 2006-10-24 | 2008-08-20 | 美国微光学公司 | Method and device for optical sensor inquiry system |
| CN101387527A (en) * | 2008-10-23 | 2009-03-18 | 曹春耕 | Optical fiber grating sensing demodulator and use thereof |
| CN201748929U (en) * | 2010-07-16 | 2011-02-16 | 山东大学 | Device for demodulating reflecting wavelength of fiber bragg grating through utilizing ASE light source spectrum falling edge |
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2010
- 2010-07-16 CN CN 201010228498 patent/CN101915593A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070058897A1 (en) * | 2003-09-08 | 2007-03-15 | Yong Jae C | Fiber bragg grating sensor system |
| CN101246026A (en) * | 2006-10-24 | 2008-08-20 | 美国微光学公司 | Method and device for optical sensor inquiry system |
| CN101169334A (en) * | 2007-11-21 | 2008-04-30 | 北京理工大学 | Intensity modulation type optical fiber sensor multiplexing method |
| CN101226051A (en) * | 2008-01-30 | 2008-07-23 | 哈尔滨师范大学 | Temperature self-compensation optical fiber/optical grating dynamic strain measurement method and system |
| CN101387527A (en) * | 2008-10-23 | 2009-03-18 | 曹春耕 | Optical fiber grating sensing demodulator and use thereof |
| CN201748929U (en) * | 2010-07-16 | 2011-02-16 | 山东大学 | Device for demodulating reflecting wavelength of fiber bragg grating through utilizing ASE light source spectrum falling edge |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103808267A (en) * | 2012-11-12 | 2014-05-21 | 中国航空工业第六一八研究所 | Spectrograph-based optical displacement sensor signal demodulation method |
| CN103808267B (en) * | 2012-11-12 | 2016-12-21 | 中国航空工业第六一八研究所 | A kind of optical displacement sensor signal demodulating method based on spectrogrph |
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Open date: 20101215 |