CN104833381A - Large-capacity weak reflection raster sensing apparatus and method based on single photon technology - Google Patents
Large-capacity weak reflection raster sensing apparatus and method based on single photon technology Download PDFInfo
- Publication number
- CN104833381A CN104833381A CN201510244022.7A CN201510244022A CN104833381A CN 104833381 A CN104833381 A CN 104833381A CN 201510244022 A CN201510244022 A CN 201510244022A CN 104833381 A CN104833381 A CN 104833381A
- Authority
- CN
- China
- Prior art keywords
- light
- weak reflection
- grating
- fiber grating
- single photon
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 38
- 238000005516 engineering process Methods 0.000 title abstract description 8
- 230000003287 optical effect Effects 0.000 claims abstract description 62
- 239000000835 fiber Substances 0.000 claims abstract description 50
- 238000001514 detection method Methods 0.000 claims abstract description 23
- 238000012545 processing Methods 0.000 claims abstract description 16
- 238000002310 reflectometry Methods 0.000 claims abstract description 5
- 230000005540 biological transmission Effects 0.000 claims description 7
- 230000035945 sensitivity Effects 0.000 claims description 7
- 238000003491 array Methods 0.000 abstract 3
- 239000013307 optical fiber Substances 0.000 description 7
- 238000012913 prioritisation Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- 238000012886 linear function Methods 0.000 description 2
- 230000003595 spectral effect Effects 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011897 real-time detection Methods 0.000 description 1
- 238000000985 reflectance spectrum Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Landscapes
- Optical Communication System (AREA)
Abstract
The invention discloses a large-capacity weak reflection raster sensing apparatus based on a single photon technology. The apparatus comprises a broadband light source, an optical isolator, an acousto-optic modulator, an optical attenuator, an optical circulator, N successively connected weak reflection fiber grating arrays, an edge filter, a single-photon detector, a data processing module and a control module. The weak reflection fiber grating arrays comprise a plurality of rasters spaced at different intervals, and N is an integer greater than and equal to one. The invention also discloses a measuring method of a large-capacity weak reflection raster sensing apparatus based on a single photon technology. According to the invention, the weak reflection fiber grating arrays are employed, the ultra low reflectivity can effectively increase the multiplexing capacity and improve the sensing length, a marshalling mode helps to avoid restrictions brought by an insufficient single photon detection dynamic scope, and the raster interval and the raster quantity of each region can be flexibly arranged according to onsite conditions in actual application; and wavelength demodulation is converted into intensity demodulation by use of the edge filter, and the system complexity is reduced.
Description
Technical field
The present invention relates to field of sensing technologies, particularly the weak reflection grating sensing device of a kind of Large Copacity based on single photon technique and method.
Background technology
Since the optical fiber invention sixties in 20th century, various optical active fiber passive devices are the focuses of research and apply always.Along with proposition and the development of Internet of Things concept, fiber-optic grating sensor, with features such as the electromagnetism interference of its excellence, small size, corrosion-resistant, easy embedding, high sensitivity, receives and pays close attention to widely and research.Because fiber-optic grating sensor can realize the sensing to multiple parameter such as temperature, stress, be widely used in power communication, build a bridge, multiple field such as petrochemical complex, space flight and aviation, biologic medical.But fiber-optic grating sensor is point sensor, and a lot of application scenarios needs to use a lot of fiber-optic grating sensors to carry out multiple spot and measures on a large scale, so use certain topological structure to carry out the multiplexing of fiber grating with regard to needing, realize quasi-distributed measurement, the more of at present application is wavelength-division multiplex and time division multiplex these two kinds.The measurement range of bandwidth and sensor that the multiplexing quantity of wavelength-division multiplex can be subject to light source limited; Time-division multiplex technology is not by the restriction of light source spectral bandwidth, there is very strong multiplexing capacity, but along with the increase of grating quantity in reality, the dutycycle of received pulse also can increase thereupon, this will cause the reduction of clarity of signal, the deterioration of system signal noise ratio, multiplexing quantity in two ways be all no more than tens.Therefore, how to improve the multiplexing capacity of fiber grating sensing system, thus realize the gordian technique that over distance sensing on a large scale become Demodulation System for Fiber Bragg practical.
At present, the solution improving the multiplexing capacity of fiber grating sensing system main has two kinds: be a kind ofly incident optical power in increase system or adopt image intensifer, but along with the rising of incident optical power, the increase of back rayleigh scattering can be caused, the signal to noise ratio (S/N ratio) of influential system., show according to research meanwhile, due to the impact of the factor such as loss of Rayleigh scattering and optical fiber, based on the traditional fiber grating demodulation system of wideband light source, can only 25km be transmitted farthest.Namely another be use new device and structure, and in jumbo grating fibers system, if use common grating multiplexing, the reflectivity due to common Bragg grating is 90%, so cannot multiplexing too many grating.
Summary of the invention
Technical matters to be solved by this invention overcomes the deficiencies in the prior art and provides the weak reflection grating sensing device of a kind of Large Copacity based on single photon technique and method, the present invention has closed time division multiplex optical fiber grating demodulation techniques and single-photon detecting survey technology, utilizes edge filter Wavelength demodulation to be converted to the complexity of intensity demodulation reduction system; Adopt the mode of organizing into groups weak reflection fiber grating permutation to make full use of the dynamic range of single photon detection simultaneously, realize the sensing measurement of high sensitivity great dynamic range.
The present invention is for solving the problems of the technologies described above by the following technical solutions:
According to the weak reflection grating sensing device of a kind of Large Copacity based on single photon technique that the present invention proposes, comprise wideband light source, optoisolator, acousto-optic modulator, optical attenuator, optical circulator, N number of weak reflection fiber grating array, edge filter, single-photon detector, data processing module and control module connected successively; Described weak reflection fiber grating array comprises the different grating of several spacing; Wherein, N is integer and N >=1;
Control module, for exporting synchronizing signal to acousto-optic modulator, optical attenuator, single photon detector module;
Wideband light source, for outputing signal light to optoisolator;
Optoisolator, for the flashlight of reception is carried out one-way transmission, exports one way signal light to acousto-optic modulator;
Acousto-optic modulator, for modulating one way signal light according to the synchronizing signal received, exports the direct impulse light of fixed cycle to optical attenuator;
Optical attenuator, for decaying to direct impulse light according to the synchronizing signal received, the direct impulse light output after decay is to the first port of optical circulator;
Optical circulator, for exporting the direct impulse light after the decay of reception to the N number of weak reflection fiber grating array connected successively by its second port;
Weak reflection fiber grating array, for when receiving the direct impulse light after decay, output meets second port of reflected light to optical circulator of the weak reflection grating of Bragg's condition of reflection, and exports edge filter to by the 3rd port of optical circulator;
Edge filter, for carrying out intensity demodulation to the reflected light received, the filtered detection light of output linearity is to single-photon detector;
Single-photon detector, for detecting detection light according to the synchronizing signal received, exports electric signal to data processing module;
Data processing module, obtains for carrying out split process to the electric signal received the curve that time domain and light intensity change, calculates the positional information of weak reflection fiber grating and the change of this position sensing amount according to this curve.
As the further prioritization scheme of a kind of Large Copacity based on single photon technique of the present invention weak reflection grating sensing device, the investigative range of described single-photon detector is-60dBm ~-100dBm.
As the further prioritization scheme of a kind of Large Copacity based on single photon technique of the present invention weak reflection grating sensing device, the reflectivity of described grating is-60dB ~-40dB.
As the further prioritization scheme of a kind of Large Copacity based on single photon technique of the present invention weak reflection grating sensing device, the power of described wideband light source is greater than 30dBm.
As the further prioritization scheme of a kind of Large Copacity based on single photon technique of the present invention weak reflection grating sensing device, described edge filter is Using Long-Period Grating in Fiber Sensor System wave filter.
Based on the measuring method of the weak reflection grating sensing device of a kind of Large Copacity based on single photon technique, comprise the following steps:
Step one, employing control module export synchronizing signal to acousto-optic modulator, optical attenuator, single photon detector module;
Step 2, employing wideband light source output signal light, this flashlight exports one way signal light to acousto-optic modulator after optoisolator one-way transmission;
Step 3, acousto-optic modulator are modulated one way signal light according to the synchronizing signal received, and export the direct impulse light of fixed cycle to optical attenuator;
Step 4, optical attenuator are decayed to direct impulse light according to the synchronizing signal received, and the 1st ~ N class survey pulsed light after output attenuatoin is to the first port of optical circulator;
Step 5, when the i-th class survey pulsed light inputs to the first port of optical circulator, optical circulator exports the i-th class survey pulsed light after decay to the N number of weak reflection fiber grating array connected successively by its second port, meet second port of reflected light to optical circulator of the weak reflection grating of Bragg's condition of reflection, and export edge filter to by the 3rd port of optical circulator, edge filter carries out intensity demodulation to this reflected light, and the filtered detection light of output linearity is to single-photon detector; Wherein, i is integer and 1≤i≤N;
The detection light that step 6, single-photon detector return according to the region of synchronizing signal to i-th weak reflection fiber grating array place detects, and exports electric signal to data processing module;
After step 7, the detection of detection light returned when the region of single-photon detector to N number of weak reflection fiber grating array place complete, data processing module carries out split process to the electric signal received and obtains the curve that time domain and light intensity change, calculates the positional information of weak reflection fiber grating and the change of this position sensing amount according to this curve.
As the further prioritization scheme of measuring method of a kind of Large Copacity based on single photon technique of the present invention weak reflection grating sensing device, the change of this position sensing amount of described calculating, specific as follows: according to the linear relationship of edge filter, obtain the change of the wavelength of weak reflection fiber grating by the light intensity change detecting the reflected light that weak reflection fiber grating reflects, then draw the change of position sensing amount with the relation of external world's biography sensitivity changes by wavelength variable quantity calibrated in advance.
The present invention adopts above technical scheme compared with prior art, has following technique effect:
(1) use single-photon detector, have high sensitivity and dynamic range, the feeble signal that detectable overlength distance place returns;
(2) adopt weak reflection fiber grating array, its ultra-low reflectance can effectively increase multiplexing capacity and improve sensing length, the restriction that the mode of carrying out organizing into groups avoids single photon detection dynamic range deficiency to bring, and grating spacings and the quantity in each region can be set according to field condition in actual use flexibly;
(3) edge filter is utilized Wavelength demodulation to be converted to the complexity of intensity demodulation reduction system.
Accompanying drawing explanation
Fig. 1 is system construction drawing of the present invention.
Fig. 2 is sequential chart and the detection gained signal curve schematic diagram of each device gating pulse.
Fig. 3 is the linear demodulation schematic diagram of edge filter.
Reference numeral in figure is interpreted as: the first port of 1-optical circulator, the second port of 2-optical circulator, the 3rd port of 3-optical circulator.
Embodiment
Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail:
System construction drawing of the present invention as shown in Figure 1, the weak reflection grating sensing device of Large Copacity based on single photon technique, comprises wideband light source, optoisolator, acousto-optic modulator, optical attenuator, optical circulator, N number of weak reflection fiber grating array, edge filter, single-photon detector, data processing module and control module connected successively; Described weak reflection fiber grating array comprises the different grating of several spacing; Wherein, N is integer and N >=1;
Control module, for exporting synchronizing signal to acousto-optic modulator, optical attenuator, single photon detector module; Use and there are three control modules triggering ports be used for synchronous sound, light modulator, optical attenuator, single-photon detector respectively by setting sequential.
Wideband light source, for outputing signal light to optoisolator;
Optoisolator, for the flashlight of reception is carried out one-way transmission, exports one way signal light to acousto-optic modulator;
Acousto-optic modulator, for modulating one way signal light according to the synchronizing signal received, exports the direct impulse light of fixed cycle to optical attenuator;
Optical attenuator, for decaying to direct impulse light according to the synchronizing signal received, the direct impulse light output after decay is to the first port one of optical circulator;
Optical circulator, for exporting the direct impulse light after the decay of reception to the N number of weak reflection fiber grating array connected successively by its second port 2;
Weak reflection fiber grating array, for when receiving the direct impulse light after decay, output meets second port of reflected light to optical circulator of the weak reflection grating of Bragg's condition of reflection, and exports edge filter to by the 3rd port 3 of optical circulator;
Edge filter, for carrying out intensity demodulation to the reflected light received, the filtered detection light of output linearity is to single-photon detector;
Single-photon detector, for detecting detection light according to the synchronizing signal received, exports electric signal to data processing module;
Data processing module, obtains for carrying out split process to the electric signal received the curve that time domain and light intensity change, calculates the positional information of weak reflection fiber grating and the change of this position sensing amount according to this curve.
The investigative range of described single-photon detector is-60dBm ~-100dBm.
The reflectivity of described grating is-60dB ~-40dB.
Described wideband light source is high-power broadband light source, and the power of described wideband light source is greater than 30dBm.
Described edge filter is Using Long-Period Grating in Fiber Sensor System wave filter.
Based on the measuring method of the weak reflection grating sensing device of a kind of Large Copacity based on single photon technique, comprise the following steps:
Step one, employing control module export synchronizing signal to acousto-optic modulator, optical attenuator, single photon detector module;
Step 2, employing wideband light source output signal light, this flashlight exports one way signal light to acousto-optic modulator after optoisolator one-way transmission;
Step 3, acousto-optic modulator are modulated one way signal light according to the synchronizing signal received, and export the direct impulse light of fixed cycle to optical attenuator;
Step 4, optical attenuator are decayed to direct impulse light according to the synchronizing signal received, and the 1st ~ N class survey pulsed light after output attenuatoin is to the first port of optical circulator;
Step 5, when the i-th class survey pulsed light inputs to the first port of optical circulator, optical circulator exports the i-th class survey pulsed light after decay to the N number of weak reflection fiber grating array connected successively by its second port, meet second port of reflected light to optical circulator of the weak reflection grating of Bragg's condition of reflection, and export edge filter to by the 3rd port of optical circulator, edge filter carries out intensity demodulation to this reflected light, and the filtered detection light of output linearity is to single-photon detector; Wherein, i is integer and 1≤i≤N;
The detection light that step 6, single-photon detector return according to the region of synchronizing signal to i-th weak reflection fiber grating array place detects, and exports electric signal to data processing module;
After step 7, the detection of detection light returned when the region of single-photon detector to N number of weak reflection fiber grating array place complete, data processing module carries out split process to the electric signal received and obtains the curve that time domain and light intensity change, calculates the positional information of weak reflection fiber grating and the change of this position sensing amount according to this curve.
The change of this position sensing amount of described calculating, specific as follows: according to the linear relationship of edge filter, the change of the wavelength of weak reflection fiber grating can be obtained by the light intensity change detecting the reflected light that weak reflection fiber grating reflects, more just can draw the change of position sensing amount with the relation that the external world passes sensitivity changes by wavelength variable quantity calibrated in advance.
Fig. 2 is sequential chart and the detection gained signal curve schematic diagram of each device gating pulse.The curve detected has reacted the strength information of reverse transmission signal, because the increase of Rayleigh scattering signal intensity along with fiber lengths declines, so curve presents shape obliquely, and will obtain reflection peak in the position at weak optical fiber Bragg grating place.
As shown in Figure 3, Fig. 3 is the linear demodulation schematic diagram of edge filter to edge filter demodulation ratio juris used in the present invention.Dotted line is the transfer curve of edge filter, represents with normalized spectral-transmission favtor curve S (λ), and solid line is the reflected optical power spectral density T (λ) of weak reflection grating.
Then weak reflection grating reflectance spectrum is by the luminous power I (λ) after edge filter:
λ is the centre wavelength of the luminous power of reflected light, in the range of linearity of edge filter, S (λ) can regard as linear function, simultaneously because the reflection spectrum width of weak optical fiber Bragg grating is generally about 0.2nm, the spectrum width of the range of linearity of edge filter of comparing is very narrow, then I (λ) also can be approximated to be linear function:
Wherein,
I
0(λ) be the reflection general power of weak reflection fiber grating.
Then known flashlight is by after edge filter, the optical wavelength of wave filter Output optical power size and input is changing into linear relationship, just can calculate weak reflection fiber grating reflected light centre wavelength drift situation like this by carrying out real-time detection light intensity change to Output optical power.In reflected signal, Rayleigh scattered light signal is very faint for weak optical fiber Bragg grating reflected light signal, and therefore it can not affect sensing accuracy.
In practical application, first the center wavelength variation amount of demarcating weak optical fiber Bragg grating is needed to pass the linear relationship of sensitivity changes with ambient temperature, stress etc., then can know the drift value of reflection kernel wavelength according to the light intensity change of the weak reflection grating detected, finally demodulate the accurate variable quantity of external environment parameter according to the linear relationship of demarcating.
Above content is in conjunction with concrete preferred implementation further description made for the present invention, can not assert that specific embodiment of the invention is confined to these explanations.For general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, some simple deductions can also be made or substitute, all should be considered as belonging to protection scope of the present invention.
Claims (7)
1. the weak reflection grating of the Large Copacity based on a single photon technique sensing device, it is characterized in that, comprise wideband light source, optoisolator, acousto-optic modulator, optical attenuator, optical circulator, N number of weak reflection fiber grating array, edge filter, single-photon detector, data processing module and control module connected successively; Described weak reflection fiber grating array comprises the different grating of several spacing; Wherein, N is integer and N >=1;
Control module, for exporting synchronizing signal to acousto-optic modulator, optical attenuator, single photon detector module;
Wideband light source, for outputing signal light to optoisolator;
Optoisolator, for the flashlight of reception is carried out one-way transmission, exports one way signal light to acousto-optic modulator;
Acousto-optic modulator, for modulating one way signal light according to the synchronizing signal received, exports the direct impulse light of fixed cycle to optical attenuator;
Optical attenuator, for decaying to direct impulse light according to the synchronizing signal received, the direct impulse light output after decay is to the first port of optical circulator;
Optical circulator, for exporting the direct impulse light after the decay of reception to the N number of weak reflection fiber grating array connected successively by its second port;
Weak reflection fiber grating array, for when receiving the direct impulse light after decay, output meets second port of reflected light to optical circulator of the weak reflection grating of Bragg's condition of reflection, and exports edge filter to by the 3rd port of optical circulator;
Edge filter, for carrying out intensity demodulation to the reflected light received, the filtered detection light of output linearity is to single-photon detector;
Single-photon detector, for detecting detection light according to the synchronizing signal received, exports electric signal to data processing module;
Data processing module, obtains for carrying out split process to the electric signal received the curve that time domain and light intensity change, calculates the positional information of weak reflection fiber grating and the change of this position sensing amount according to this curve.
2. the weak reflection grating sensing device of a kind of Large Copacity based on single photon technique according to claim 1, is characterized in that, the investigative range of described single-photon detector is-60dBm ~-100dBm.
3. the weak reflection grating sensing device of a kind of Large Copacity based on single photon technique according to claim 1, is characterized in that, the reflectivity of described grating is-60dB ~-40dB.
4. the weak reflection grating sensing device of a kind of Large Copacity based on single photon technique according to claim 1, it is characterized in that, the power of described wideband light source is greater than 30dBm.
5. the weak reflection grating sensing device of a kind of Large Copacity based on single photon technique according to claim 1, it is characterized in that, described edge filter is Using Long-Period Grating in Fiber Sensor System wave filter.
6., based on the measuring method of the weak reflection grating sensing device of a kind of Large Copacity based on single photon technique according to claim 1, it is characterized in that, comprise the following steps:
Step one, employing control module export synchronizing signal to acousto-optic modulator, optical attenuator, single photon detector module;
Step 2, employing wideband light source output signal light, this flashlight exports one way signal light to acousto-optic modulator after optoisolator one-way transmission;
Step 3, acousto-optic modulator are modulated one way signal light according to the synchronizing signal received, and export the direct impulse light of fixed cycle to optical attenuator;
Step 4, optical attenuator are decayed to direct impulse light according to the synchronizing signal received, and the 1st ~ N class survey pulsed light after output attenuatoin is to the first port of optical circulator;
Step 5, when the i-th class survey pulsed light inputs to the first port of optical circulator, optical circulator exports the i-th class survey pulsed light after decay to the N number of weak reflection fiber grating array connected successively by its second port, meet second port of reflected light to optical circulator of the weak reflection grating of Bragg's condition of reflection, and export edge filter to by the 3rd port of optical circulator, edge filter carries out intensity demodulation to this reflected light, and the filtered detection light of output linearity is to single-photon detector; Wherein, i is integer and 1≤i≤N;
The detection light that step 6, single-photon detector return according to the region of synchronizing signal to i-th weak reflection fiber grating array place detects, and exports electric signal to data processing module;
After step 7, the detection of detection light returned when the region of single-photon detector to N number of weak reflection fiber grating array place complete, data processing module carries out split process to the electric signal received and obtains the curve that time domain and light intensity change, calculates the positional information of weak reflection fiber grating and the change of this position sensing amount according to this curve.
7. the measuring method of the weak reflection grating sensing device of a kind of Large Copacity based on single photon technique according to claim 6, it is characterized in that, the change of this position sensing amount of described calculating, specific as follows: according to the linear relationship of edge filter, obtain the change of the wavelength of weak reflection fiber grating by the light intensity change detecting the reflected light that weak reflection fiber grating reflects, then draw the change of position sensing amount with the relation of external world's biography sensitivity changes by wavelength variable quantity calibrated in advance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510244022.7A CN104833381B (en) | 2015-05-13 | 2015-05-13 | Large-capacity weak reflection raster sensing apparatus and method based on single photon technology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510244022.7A CN104833381B (en) | 2015-05-13 | 2015-05-13 | Large-capacity weak reflection raster sensing apparatus and method based on single photon technology |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104833381A true CN104833381A (en) | 2015-08-12 |
| CN104833381B CN104833381B (en) | 2017-04-26 |
Family
ID=53811414
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510244022.7A Active CN104833381B (en) | 2015-05-13 | 2015-05-13 | Large-capacity weak reflection raster sensing apparatus and method based on single photon technology |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104833381B (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105157812A (en) * | 2015-09-18 | 2015-12-16 | 南京派光信息技术有限公司 | Digital enhanced interference-based high-sensitivity quasi-distributed fiber bragg grating vibration sensor |
| CN105973277A (en) * | 2016-05-03 | 2016-09-28 | 华南师范大学 | Realization apparatus and method for distributed optical fiber sensing system based on single photon detection |
| CN109357693A (en) * | 2018-04-11 | 2019-02-19 | 金帆智华（北京）科技有限公司 | A kind of detection system and method for low reflected energy fiber grating |
| CN110017890A (en) * | 2019-05-14 | 2019-07-16 | 广西师范大学 | A method of improving edge filter demodulation method linear demodulation region |
| CN114156721A (en) * | 2021-12-02 | 2022-03-08 | 长飞光纤光缆股份有限公司 | Gain flat optical fiber amplifier based on temperature-locking optical fiber grating and control method thereof |
| CN114166765A (en) * | 2021-12-01 | 2022-03-11 | 上海交通大学 | Spectrum measurement system based on single photon detector array |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5757487A (en) * | 1997-01-30 | 1998-05-26 | The United States Of America As Represented By The Secretary Of The Navy | Methods and apparatus for distributed optical fiber sensing of strain or multiple parameters |
| CN101788310A (en) * | 2010-02-11 | 2010-07-28 | 西南交通大学 | Fiber bragg grating track sensing system based on optical code division multiple access technique |
| CN102102999A (en) * | 2010-12-16 | 2011-06-22 | 华中科技大学 | Sensing multiplexing system based on non-equidistant weak Bragg reflection fiber Bragg grating array |
| CN102620857A (en) * | 2012-03-27 | 2012-08-01 | 南京大学 | Brillouin optical time domain reflectometer for single-photon detection based on edged filter method |
| CN102914321A (en) * | 2012-10-15 | 2013-02-06 | 武汉理工大学 | Ultra-low fiber bragg grating sensing system and query method thereof |
-
2015
- 2015-05-13 CN CN201510244022.7A patent/CN104833381B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5757487A (en) * | 1997-01-30 | 1998-05-26 | The United States Of America As Represented By The Secretary Of The Navy | Methods and apparatus for distributed optical fiber sensing of strain or multiple parameters |
| CN101788310A (en) * | 2010-02-11 | 2010-07-28 | 西南交通大学 | Fiber bragg grating track sensing system based on optical code division multiple access technique |
| CN102102999A (en) * | 2010-12-16 | 2011-06-22 | 华中科技大学 | Sensing multiplexing system based on non-equidistant weak Bragg reflection fiber Bragg grating array |
| CN102620857A (en) * | 2012-03-27 | 2012-08-01 | 南京大学 | Brillouin optical time domain reflectometer for single-photon detection based on edged filter method |
| CN102914321A (en) * | 2012-10-15 | 2013-02-06 | 武汉理工大学 | Ultra-low fiber bragg grating sensing system and query method thereof |
Non-Patent Citations (2)
| Title |
|---|
| 《基于FBG传感器的分复用技术》;姜德生等;《激光与光电子学进展》;20050428;第42卷(第4期);第14-19页 * |
| 姜德生等: "《基于FBG传感器的分复用技术》", 《激光与光电子学进展》 * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105157812A (en) * | 2015-09-18 | 2015-12-16 | 南京派光信息技术有限公司 | Digital enhanced interference-based high-sensitivity quasi-distributed fiber bragg grating vibration sensor |
| CN105973277A (en) * | 2016-05-03 | 2016-09-28 | 华南师范大学 | Realization apparatus and method for distributed optical fiber sensing system based on single photon detection |
| CN109357693A (en) * | 2018-04-11 | 2019-02-19 | 金帆智华（北京）科技有限公司 | A kind of detection system and method for low reflected energy fiber grating |
| CN110017890A (en) * | 2019-05-14 | 2019-07-16 | 广西师范大学 | A method of improving edge filter demodulation method linear demodulation region |
| CN114166765A (en) * | 2021-12-01 | 2022-03-11 | 上海交通大学 | Spectrum measurement system based on single photon detector array |
| CN114156721A (en) * | 2021-12-02 | 2022-03-08 | 长飞光纤光缆股份有限公司 | Gain flat optical fiber amplifier based on temperature-locking optical fiber grating and control method thereof |
| CN114156721B (en) * | 2021-12-02 | 2024-04-26 | 长飞光纤光缆股份有限公司 | Gain flat optical fiber amplifier based on temperature locking optical fiber grating and control method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104833381B (en) | 2017-04-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104833381A (en) | Large-capacity weak reflection raster sensing apparatus and method based on single photon technology | |
| CN102914321B (en) | Ultra-low fiber bragg grating sensing system and query method thereof | |
| CN102901525B (en) | Ultra-large capacity time division and wavelength division fiber grating sensing system and query method thereof | |
| CN106643832A (en) | Phase-sensitive optical time-domain reflectometer based on linear frequency-modulation pulse and measurement method of phase-sensitive optical time-domain reflectometer | |
| CN102052930B (en) | Fiber bragg grating distributed strain sensor and strain monitoring method thereof | |
| CN105675032B (en) | Real-time dynamic distributed Brillouin light fiber sensing equipment and method | |
| CN206496768U (en) | A kind of phase sensitive optical time domain reflectometer based on chirp | |
| CN103954310B (en) | A kind of large Dynamic Signal demodulating equipment and demodulation method of interferometric optical fiber sensor | |
| CN102102998A (en) | Distributed sensing system based on weak Bragg reflection structure | |
| CN104848880B (en) | A kind of quasi-distributed optical sensing devices based on photon technique | |
| CN106940444A (en) | Coherent Doppler wind-observation laser radar based on microwave differential gain | |
| CN107340077B (en) | Sensing method and sensing system for full-distributed optical fiber temperature and stress | |
| CN101476901B (en) | Demodulation system and method for optical fiber Fabry-Perot sensor | |
| CN203534538U (en) | A fiber grating sensing system based on a narrowband scan light source | |
| CN104034409A (en) | Distributed optical fiber vibration sensing method and system based on pulse code external modulation | |
| CN103674916A (en) | Novel fluorescence signal demodulating device and method | |
| CN101319919B (en) | Method and device for demodulation of frequency domain optical fiber optical grating sensing network | |
| Mao et al. | Demonstration of In-Car Doppler Laser Radar at 1.55$\mu\hbox {m} $ for Range and Speed Measurement | |
| CN107290042B (en) | Optical fiber grating sensing modulation-demo-demodulation method and device based on phase shift signal modulation | |
| CN101625279A (en) | Device for positioning optical fiber breakpoints and method for confirming breakpoint positions | |
| CN105444793A (en) | Fiber Bragg raster sensing device based on high-speed pulse laser | |
| CN102269911A (en) | Optical demodulation method based on OTDR (Optical Time Domain Reflectometry) technology and optical demodulation device thereof | |
| CN103438915A (en) | F-P sensor multiplexing method and system based on frequency shift interference | |
| CN102564481A (en) | Method and device for improving signal-to-noise ratio of distributed optical fiber Brillouin sensor | |
| CN115201842A (en) | Optical frequency comb dispersion interference multi-channel parallel absolute distance measurement system and method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| EXSB | Decision made by sipo to initiate substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |