CN103335979A - High-sensitivity inner-cavity gas detector based on composite cavity optical fiber laser device - Google Patents
High-sensitivity inner-cavity gas detector based on composite cavity optical fiber laser device Download PDFInfo
- Publication number
- CN103335979A CN103335979A CN2013102973701A CN201310297370A CN103335979A CN 103335979 A CN103335979 A CN 103335979A CN 2013102973701 A CN2013102973701 A CN 2013102973701A CN 201310297370 A CN201310297370 A CN 201310297370A CN 103335979 A CN103335979 A CN 103335979A
- Authority
- CN
- China
- Prior art keywords
- fiber
- grating
- optical fiber
- piezoelectric actuator
- optical
- 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.)
- Pending
Links
Images
Landscapes
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The invention discloses a high-sensitivity inner-cavity gas detector based on a composite cavity optical fiber laser device. The gas detector is characterized by comprising a composite cavity distributed feedback type optical fiber laser device and an optical signal demodulation device matched with the composite cavity distributed feedback type optical fiber laser device; a gas absorption pool is arranged between an Er-doped fiber and an optical fiber Pi-phase shifting optical grating; the composite cavity distributed feedback type optical fiber laser device comprises a pump light source; the pump light source is connected with a 980 end of WDM (wavelength division multiplexing); a 1550 end of the WDM is connected with an incidence end of an optical fiber annular device; a WDM public end is connected with a first optical fiber optical grating, the Er-doped fiber, the optical fiber Pi-phase shifting optical grating and a second optical fiber optical grating in series sequentially; the wavelength of optical laser produced by the composite cavity optical fiber laser device is consistent with the a central window wavelength of the optical fiber Pi-phase shifting optical grating; two ends of the first optical fiber optical grating, the second optical fiber optical grating and the optical fiber Pi-phase shifting optical grating are all fixed on a first piezoelectric micrometric displacement device, a second piezoelectric micrometric displacement device and a fourth piezoelectric micrometric displacement device respectively.
Description
Technical field
Patent of the present invention relates to a kind of active cavity fiber-optic fiber gas detection system of Compound Cavity fiber laser technology, uses based on active complexed cavity technique gas concentration is carried out highly sensitive real-time online detection.
Background technology
In commercial production and daily life, can produce inevitably that some are inflammable, explosive, harmful gases, these gases not only can the serious threat production safety, also can cause certain harm to ecologic environment.Therefore, need in time the concentration of these gases is detected rapidly accurately, prevent from being unfavorable for keeping the safety in production and the event of people's life takes place, it is imperative to study high-precision gas detection technology.
Traditional gas sensor mainly is to comprise semiconductor-type, electric chemical formula, catalytic combustion type, solid electrolyte formula etc., this class gas sensor low price, easy operating, but measurement range is less, and precision is low, and each is to two weeks needing to proofread and correct once, long-term reliability is poor, and serviceable life is shorter; The vapor-phase chromatography gas analyzer that grew up afterwards, the accuracy of detection height, but exist sampling difficulty, measuring period long, can not on-line measurement, shortcoming such as real-time difference.The infrared gas senor of rising in recent years can be realized remote detection in real time, still has the temperature drift, is subjected to moisture effect bigger, is subjected to the problems such as influence that other gas componants intersections absorb easily.
Along with the development of Fibre Optical Sensor and optical communication technology, the fiber gas sensor that absorbs based on narrow-band spectrum is paid close attention to widely because of the characteristic of numerous excellences such as anti-electromagnetic interference (EMI), volume are little, high temperature resistant, corrosion-resistant.It uses light transmitting fiber as senser element or transmission signal vector, is specially adapted to the measurement under exceedingly odious conditions such as inflammable and explosive, high temperature, high pressure, humidity, strong-electromagnetic field, severe corrosive.At present the optoelectronic device great majority of comparative maturity are operated in near-infrared band, but gas molecule is general more weak in the absorption of near-infrared band, especially as gases such as carbon monoxide, and absorption coefficient even be 10
-23Magnitude, this has just limited the detection sensitivity of trace gas.In order to improve sensitivity, adopt phase lock amplifying technology to survey feeble signal, can improve detection sensitivity to a certain extent like this, but the circuit structure complexity has also been brought instability to detection system.Another effective method is exactly to adopt long optical path pool to increase the absorption light path of gas, causes sensing probe very huge like this, and the growth of the response time of system, and long-time stability are poor.
As a kind of novel optical fiber gas sensing method, the active inner cavity method is introduced gas absorption cell in the resonator cavity of laser instrument, and make the excitation wavelength of laser instrument corresponding with the absorption spectrum of gas to be measured, laser repeatedly passes through gas to be measured in the oscillatory process in resonator cavity, thereby be very big effective absorption light path with less gas absorption cell length equivalence, need not increase under the situation of sensing probe size, greatly improve the sensitivity that gas detects.
Summary of the invention
Fundamental purpose of the present invention is a kind of active Compound Cavity high sensitivity of optical-fiber laser gas detecting system for the gas detection of design.
This programme is realized by following technical measures: a kind of high sensitivity inner chamber gas detecting instrument based on the Compound Cavity fiber laser, it is characterized in that it comprises Compound Cavity distributed feed-back formula fiber laser and the light signal demodulating equipment that cooperates with it, it is characterized in that described light signal demodulating equipment comprises the photodetector that is connected with Compound Cavity distributed feed-back formula optical fiber laser output end, arranges capture card between photodetector and computing machine; Between Er-doped fiber and optical fiber π phase-shifted grating, be provided with gas absorption cell;
Compound Cavity distributed feed-back formula fiber laser comprises pump light source, WDM, first fiber grating, Er-doped fiber, optical fiber π phase-shifted grating and second fiber grating; Wherein unite a Compound Cavity constituting as resonator cavity by first fiber grating and these two Fiber Bragg Grating FBGs of second fiber grating and optical fiber π phase-shifted grating; Pump light source links to each other with 980 ends of WDM, and 1550 ends of WDM link to each other with the incident end of optical fiber annular device, and the WDM common port is connected with first fiber grating, Er-doped fiber, optical fiber π phase-shifted grating and second fiber grating successively; The optical maser wavelength that described Compound Cavity distributed feed-back formula fiber laser produces and optical fiber π phase-shifted grating center window consistent wavelength; First fiber grating, second fiber grating and optical fiber π phase-shifted grating two ends are fixed on first piezoelectric actuator respectively, on second piezoelectric actuator and the 4th piezoelectric actuator.
The concrete characteristics of this programme also have, first piezoelectric actuator, second piezoelectric actuator and the 4th piezoelectric actuator all are electrically connected with signal generator, signal generator is applied to first piezoelectric actuator by control respectively, voltage on second piezoelectric actuator and the 4th piezoelectric actuator is adjusted first fiber grating, second fiber grating and optical fiber π phase-shifted grating centre wavelength and is consistent, and signal generator produces the stroke of an analog voltage signal control piezoelectric actuator.
The common port of annular device links to each other with the 3rd fiber grating, the 3rd fiber grating is fixed on the 3rd piezoelectric actuator, the 3rd piezoelectric actuator is electrically connected with signal generator, and signal generator is applied to voltage on the 3rd piezoelectric actuator by control and adjusts first fiber grating, second fiber grating, the 3rd fiber grating and optical fiber π phase-shifted grating centre wavelength and be consistent.
Signal generator is the signal generator with sawtooth wave output function, and signal generator and computing machine electrically connect.Signal generator adopts computer-controlled signal generator, can be according to the sawtooth voltage signal of computer control instruction output different frequency, different DC component and wave amplitude.
Optical fiber π phase-shifted grating is to inscribe one section grating at optical fiber, and producing a phase place in the grating centre position is the phase shift of π, thereby makes grating open a very narrow window in the middle of composing.
Described Compound Cavity distributed feed-back formula fiber laser is under the sawtooth wave of signal generator output drives, and output wavelength can cover at least one absorption peak of gas to be measured.
Gas absorption cell adopts collimating apparatus prescription formula, is made of a pair of optical fiber collimator, and light forms parallel beam output by collimating apparatus, through entering into another collimating apparatus behind one section air and being coupled to optical fiber.
The invention has the beneficial effects as follows:First fiber grating and second fiber grating use as catoptron in laser system, make laser system possess stable resonator cavity.Er-doped fiber is used for enough gains are provided, and the system that makes can reach the population upset, thereby reaches lasing condition.Optical fiber π phase-shifted grating is mainly used in the effect of filtering limit mould in this laser system, suppress other wavelength longitudinal modes, only allows phase-shifted grating window wavelength place to form stable single-mode laser.The 3rd fiber grating is equivalent to narrow band filter, and output laser is carried out further noise reduction process, removes remaining ASE background spectrum, improves system signal noise ratio.Described gas absorption cell belongs to the part in Linear Laser chamber in laserresonator, laser will repeatedly pass through air chamber in the process of resonator cavity concussion, thereby is very big effective absorption light path with less gas absorption cell length equivalence.Adopt fiber grating to form laserresonator as catoptron, constitute composite chamber laser by Er-doped fiber as the gain amplifier medium, this type of laser instrument has good stable; Different with traditional DBR fiber laser is, inserted optical fiber π phase-shifted grating in the laser cavity that the present invention relates to, this device has played the effect of modeling wave filter, and when the chamber of fiber laser was longer, its corresponding longitudinal mode spacing also diminished, be easy to generate multimode, and after inserting optical fiber π phase-shifted grating, except the wavelength of phase-shifted grating center window, other longitudinal modes all are suppressed and lose, and then strengthened the single-frequency characteristic of laser, make that laser output is more reliable and more stable.The present invention utilizes the narrow-band filtering characteristic of the 3rd fiber grating that output laser has been carried out further noise reduction process, has removed remaining ASE background spectrum, has improved system signal noise ratio.Described first fiber grating, second fiber grating and the 3rd fiber grating and optical fiber π phase-shifted grating all are fixed on the piezoelectric actuator (PZT), under the driving of sawtooth wave, PZT gives first fiber grating, second fiber grating and the 3rd fiber grating and stress of optical fiber π phase-shifted grating, cause the variation of grating wavelength, thereby realized producing control and the scanning of optical maser wavelength.Stretch three fiber gratings of synchronous modulation and optical fiber π phase-shifted grating by PZT, realized the scanning of output optical maser wavelength.Air chamber is placed in the resonator cavity, and the process of utilizing photon to vibrate in resonator cavity to form laser increases effective light path repeatedly by air chamber under the situation that does not increase air chamber length, improve detection sensitivity greatly.Simultaneously, because the wide wavelength coverage of erbium doped fiber laser can satisfy the demand that multiple gases detects simultaneously.And all optical fibre structure makes that sensing probe (gas absorption cell) can be operated at a distance, in the rugged environment.
Description of drawings
Fig. 1 system construction drawing; Fig. 2 drives the signal output waveform figure of signal; Absorption signal after the normalization of Fig. 3 acetylene gas.
Among the figure: the 1-pump light source; 2-wavelength division multiplexer (WDM); The 3-Er-doped fiber; 4-optical fiber annular device; 5-the 3rd fiber grating; 6-first fiber grating; 7-gas absorption cell (gas sensing probe); 8-optical fiber π phase-shifted grating; 9-second fiber grating; The 10-photodetector; The 11-capture card; The 12-computing machine; The 13-signal generator; 14-first piezoelectric actuator; 15-second piezoelectric actuator; 16-the 3rd piezoelectric actuator; 17-the 4th piezoelectric actuator; 18-optical fiber annular device incident end; 19-optical fiber annular device common port, 20-optical fiber annular device output terminal.
Embodiment
As shown in Figure 1, a kind of high sensitivity inner chamber gas detecting instrument based on the Compound Cavity fiber laser, it comprises Compound Cavity distributed feed-back formula fiber laser and the light signal demodulating equipment that cooperates with it, be that described light signal demodulating equipment comprises the photodetector 10 that is connected with Compound Cavity distributed feed-back formula optical fiber laser output end, between photodetector 10 and computing machine 12, capture card 11 be set; Between Er-doped fiber 3 and optical fiber π phase-shifted grating 8, be provided with gas absorption cell 7; Compound Cavity distributed feed-back formula fiber laser comprises pump light source 1, WDM2, first fiber grating 6, Er-doped fiber 3, optical fiber π phase-shifted grating 8 and second fiber grating 9; Wherein unite a Compound Cavity constituting as resonator cavity by first fiber grating 6 and second fiber grating, 9 these two Fiber Bragg Grating FBGs and optical fiber π phase-shifted grating 8; Pump light source 1 links to each other with 980 ends of WDM2, and 1550 ends of WDM2 link to each other with optical fiber annular device incident end 18, and the WDM common port is connected with first fiber grating 6, Er-doped fiber 3, optical fiber π phase-shifted grating 8 and second fiber grating 9 successively; The optical maser wavelength that described Compound Cavity distributed feed-back formula fiber laser produces and optical fiber π phase-shifted grating 8 center window consistent wavelength; First fiber grating, 6, the second fiber gratings 9 and optical fiber π phase-shifted grating 8 two ends are fixed on first piezoelectric actuator, 14, the second piezoelectric actuators 15 and the 4th piezoelectric actuator 17 respectively.
First piezoelectric actuator 14, second piezoelectric actuator 15 and the 4th piezoelectric actuator 17 all are electrically connected with signal generator 13, signal generator 13 is applied to first piezoelectric actuator 14 by control respectively, voltage on second piezoelectric actuator 15 and the 4th piezoelectric actuator 17 is adjusted first fiber grating 6, second fiber grating 9 and optical fiber π phase-shifted grating 8 centre wavelengths and is consistent, and signal generator 13 produces the stroke of an analog voltage signal control piezoelectric actuator.
Optical fiber annular device common port 19 links to each other with the 3rd fiber grating 5, the 3rd fiber grating 5 is fixed on the 3rd piezoelectric actuator 16, the 3rd piezoelectric actuator 16 is electrically connected with signal generator 13, and signal generator 13 is applied to voltage on the 3rd piezoelectric actuator 16 by control and adjusts first fiber grating 6, second fiber grating 9, the 3rd fiber grating 5 and optical fiber π phase-shifted grating 8 centre wavelengths and be consistent.
Optical fiber π phase-shifted grating 8 is to inscribe one section grating at optical fiber, and producing a phase place in the grating centre position is the phase shift of π, thereby makes grating open a very narrow window in the middle of composing.
The XP-633.1SL piezoelectric actuator that has adopted Harbin Science and Technology Ltd.'s core tomorrow to produce in the present embodiment.PZT is connected with signal generator 13, and signal generator 13 has adopted the signal generator with sawtooth wave output function in the present embodiment, and simulating signal of signal generator output is used for driving piezoelectric actuator.
Pump light source 1 is the semiconductor laser of 980nm for output wavelength, and device is optical communication device commonly used.
The photon that produces when fiber laser during by pumping, fiber laser will be in resonator cavity forms stable single mode running laser through vibration repeatedly, photon will repeatedly interact through gas absorption cell and gas in oscillatory process, increase effective light path of gas absorption greatly.
During measurement gas, at first pump light source 1 is selected 980nm semiconductor laser commonly used, pumping laser 1 enters in the Compound Cavity of first fiber grating 6, Er-doped fiber 3, gas absorption cell 7, optical fiber π phase-shifted grating 8 and second fiber grating, 9 formations by WDM2, the 980nm pumping laser is absorbed by Er-doped fiber 3, because this structure possesses the laser starting condition for oscillation, thereby produce the laser of 1.5um wavelength, optical maser wavelength is consistent with optical fiber π phase-shifted grating 8 middle windows.
It is flexible that computing machine 12 is controlled first piezoelectric actuator 14, second piezoelectric actuator 15, the 3rd piezoelectric actuator 16 and the 4th piezoelectric actuator 17 respectively by control signal generator 13, thereby realize first fiber grating, 6, the second fiber gratings 9 and the 3rd fiber grating 5 and optical fiber π phase-shifted grating 8 are subjected to the control of stress intensity respectively.First fiber grating 6, second fiber grating 9 and the 3rd fiber grating 5 and optical fiber π phase-shifted grating 8 are separately fixed at first piezoelectric actuator 14, second piezoelectric actuator 15, on the 3rd piezoelectric actuator 16 and the 4th piezoelectric actuator 17, when PZT is subjected to different voltage, its length changes, thereby causes that the pulling force that grating is subjected to changes, and causes wavelength shift.When signal generator 13 gives synchronous sawtooth voltage of four PZT, can realize the scanning to grating wavelength.Because this Compound Cavity fiber laser output optical maser wavelength is relevant with the wavelength of four gratings, therefore pass through the control of 13 couples of PZT of signal generator, realized the laser wavelength scanning function, this laser instrument is under sawtooth wave drives, and output wavelength can cover at least one absorption peak of gas to be measured.
Light signal to output behind the Compound Cavity distributed feed-back formula laser instrument enters the 3rd fiber grating 5 through optical fiber annular device 4, turned back to optical fiber annular device 4 after 5 filtering of the 3rd fiber grating, output to photodetector 10 by optical fiber annular device 4 again, photodetector 10 carries out opto-electronic conversion, the light signal that air inclusion is absorbed information is transformed into electric signal, electric signal enters computing machine 12 through capture card 11, by electric signal is handled, gets final product the concentration information that inverting obtains gas to be measured.
Because the wavelength coverage of erbium doped fiber laser is wide, can satisfy the demand that multiple gases detects.Gases such as acetylene, carbon monoxide, carbon dioxide, hydrogen iodide, ammonia, sulfuretted hydrogen all available this invention detect, what need to adjust is that described fiber grating and optical fiber π phase-shifted grating centre wavelength are selected in corresponding gas absorption wavelength to be measured position, several gases that provide as table 1 and the absorption peak wavelength of reference proposition thereof.The Er-doped fiber here substitutes with the optical fiber of mixing doping particles such as ytterbium or thulium, can measure a greater variety of gases.Table 1: variety classes gas is in the main absorbing wavelength of near-infrared band
Computing machine detects principle according to the detector circuit voltage signal situation of change that collects and absorption type gas, can calculate gas concentration value.It is as follows that detailed gas detects principle:
Gas detects principle:
Gas with various has its intrinsic characteristic absorpting spectruming line, when a branch of light process gas to be measured, will be absorbed selectively by gas.According to Bill-lambert (Beer-Lambert) absorption law, it is I that laser instrument sends intensity
0, wavelength is the laser of λ, be the absorbing medium of L by length after, the light intensity that records at receiving end is
I(λ) = I
0 (λ)exp[ - α(λ) L C ]， （1）
Wherein L is the optical path length of gas absorption cell, and α (λ) is gas at the absorption coefficient of certain af at wavelength lambda, and C is for absorbing the concentration of gas.
Therefore, gas concentration
(2)
The signal that obtains when being illustrated in figure 3 as the acetylene gas variable concentrations, three curves are respectively concentration 0.1%, 0.05% and 0.001% signal, and concentration is more high, and gas absorption is more strong, just can be finally inversed by the concentration of gas to be measured according to the crest height of absorption signal.
Described Er-doped fiber can replace with the optical fiber of other doped dielectric, as mixes ytterbium, thulium or erbium-ytterbium co-doped fiber etc., changes the doping particle kind and can enlarge the output wave band of fiber laser, and then can measure a greater variety of gases.
Described a kind of active cavity gas detecting system based on the Compound Cavity fiber laser technology is characterized in that described WDM, fiber grating, annular device etc. are Fibre Optical Sensor and the optic communication device of general commercial.
The replacement scheme that the White of optical fiber coupling or Herriot pond and photon crystal fiber-optic fiber gas absorption cell etc. all can be used as this patent gas absorption cell.
Described detector is optical communication indium potassium arsenic photoelectric detector commonly used.
Claims (7)
1. high sensitivity inner chamber gas detecting instrument based on the Compound Cavity fiber laser, it is characterized in that it comprises Compound Cavity distributed feed-back formula fiber laser and the light signal demodulating equipment that cooperates with it, it is characterized in that described light signal demodulating equipment comprises the photodetector that is connected with Compound Cavity distributed feed-back formula optical fiber laser output end, arranges capture card between photodetector and computing machine; Between Er-doped fiber and optical fiber π phase-shifted grating, be provided with gas absorption cell;
Compound Cavity distributed feed-back formula fiber laser comprises pump light source, WDM, first fiber grating, Er-doped fiber, optical fiber π phase-shifted grating and second fiber grating; Wherein unite a Compound Cavity constituting as resonator cavity by first fiber grating and these two Fiber Bragg Grating FBGs of second fiber grating and optical fiber π phase-shifted grating; Pump light source links to each other with 980 ends of WDM, and 1550 ends of WDM link to each other with the incident end of optical fiber annular device, and the WDM common port is connected with first fiber grating, Er-doped fiber, optical fiber π phase-shifted grating and second fiber grating successively; The optical maser wavelength that described Compound Cavity distributed feed-back formula fiber laser produces and optical fiber π phase-shifted grating center window consistent wavelength; First fiber grating, second fiber grating and optical fiber π phase-shifted grating two ends are fixed on first piezoelectric actuator respectively, on second piezoelectric actuator and the 4th piezoelectric actuator.
2. the high sensitivity inner chamber gas detecting instrument based on the Compound Cavity fiber laser according to claim 1, it is characterized in that first piezoelectric actuator, second piezoelectric actuator and the 4th piezoelectric actuator all are electrically connected with signal generator, signal generator is applied to first piezoelectric actuator by control respectively, voltage on second piezoelectric actuator and the 4th piezoelectric actuator is adjusted first fiber grating, second fiber grating and optical fiber π phase-shifted grating centre wavelength are consistent, and signal generator produces the stroke of an analog voltage signal control piezoelectric actuator.
3. the high sensitivity inner chamber gas detecting instrument based on the Compound Cavity fiber laser according to claim 1, the common port that it is characterized in that annular device links to each other with the 3rd fiber grating, the 3rd fiber grating is fixed on the 3rd piezoelectric actuator, the 3rd piezoelectric actuator is electrically connected with signal generator, and signal generator is applied to voltage on the 3rd piezoelectric actuator by control and adjusts first fiber grating, second fiber grating, the 3rd fiber grating and optical fiber π phase-shifted grating centre wavelength and be consistent.
4. the high sensitivity inner chamber gas detecting instrument based on the Compound Cavity fiber laser according to claim 1, it is characterized in that signal generator is the signal generator with sawtooth wave output function, signal generator and computing machine electrically connect, can be according to the sawtooth voltage signal of computer control instruction output different frequency, different DC component and wave amplitude.
5. the high sensitivity inner chamber gas detecting instrument based on the Compound Cavity fiber laser according to claim 1, it is characterized in that optical fiber π phase-shifted grating is to inscribe one section grating at optical fiber, producing a phase place in the grating centre position is the phase shift of π, thereby makes grating open a very narrow window in the middle of composing.
6. the high sensitivity inner chamber gas detecting instrument based on the Compound Cavity fiber laser according to claim 1, it is characterized in that described Compound Cavity distributed feed-back formula fiber laser under the sawtooth wave of signal generator output drives, output wavelength can cover at least one absorption peak of gas to be measured.
7. the high sensitivity inner chamber gas detecting instrument based on the Compound Cavity fiber laser according to claim 1, it is characterized in that gas absorption cell adopts collimating apparatus prescription formula, constituted by a pair of optical fiber collimator, light forms parallel beam output by collimating apparatus, through entering into another collimating apparatus behind one section air and being coupled to optical fiber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013102973701A CN103335979A (en) | 2013-07-16 | 2013-07-16 | High-sensitivity inner-cavity gas detector based on composite cavity optical fiber laser device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013102973701A CN103335979A (en) | 2013-07-16 | 2013-07-16 | High-sensitivity inner-cavity gas detector based on composite cavity optical fiber laser device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103335979A true CN103335979A (en) | 2013-10-02 |
Family
ID=49244183
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013102973701A Pending CN103335979A (en) | 2013-07-16 | 2013-07-16 | High-sensitivity inner-cavity gas detector based on composite cavity optical fiber laser device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103335979A (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103558181A (en) * | 2013-11-06 | 2014-02-05 | 郑州光力科技股份有限公司 | Online monitoring system for sulfur hexafluoride switch |
| US8928885B1 (en) | 2013-10-14 | 2015-01-06 | Beijing Information Science & Technology University | Gas detection system using semiconductor laser with feedback compensation by gas reference cavity |
| US9029819B2 (en) | 2013-10-14 | 2015-05-12 | Beijing Information Science & Technology University | Gas detection system using intracavity fiber laser with loop cavity having saturated absorption fiber |
| CN105067563A (en) * | 2015-07-09 | 2015-11-18 | 中国科学院上海光学精密机械研究所 | Open space gas average concentration measuring device and measuring method |
| CN105699327A (en) * | 2016-03-11 | 2016-06-22 | 济南大学 | System and method for detecting laser based on micro-nano Er-doped fiber |
| CN105866069A (en) * | 2016-04-20 | 2016-08-17 | 北京信息科技大学 | Gas composition test system based on tunable fiber laser |
| WO2016127323A1 (en) * | 2015-02-10 | 2016-08-18 | 深圳大学 | Laser-based sensor |
| CN108871419A (en) * | 2018-04-20 | 2018-11-23 | 南京航空航天大学 | More physical quantity optical fiber sensing systems, the control of its feedback loop and its detection method |
| CN109115722A (en) * | 2018-06-22 | 2019-01-01 | 山东建筑大学 | A kind of highly sensitive phase demodulating optical fiber gas sensing system |
| CN114235743A (en) * | 2021-12-20 | 2022-03-25 | 武汉理工大学 | Hydrogen detection device based on phase shift grating temperature compensation technology |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002016909A1 (en) * | 2000-08-18 | 2002-02-28 | The Government Of The United States Of America, As Represented By The Secretary Of The Navy | A method and apparatus for transverse load sensing by use of pi-phase shifted optical fiber |
| US20030219257A1 (en) * | 2002-03-06 | 2003-11-27 | Aston Photonic Technologies Limited | Generating electronic carrier signals in the optical domain |
| CN101483304A (en) * | 2009-02-25 | 2009-07-15 | 中国科学院上海光学精密机械研究所 | Distributed Bragg reflection type single-frequency fiber laser based on phase-shift fiber grating |
| CN101975752A (en) * | 2010-09-10 | 2011-02-16 | 山东大学 | Intracavity gas detection system and method based on wavelength scan |
| CN102359943A (en) * | 2011-06-23 | 2012-02-22 | 天津大学 | Photonic crystal fibre-optical air chamber active cavity absorption-type gas detection device |
| CN202260115U (en) * | 2011-10-28 | 2012-05-30 | 李国玉 | Linearly-tunable short straight cavity optical fiber laser |
-
2013
- 2013-07-16 CN CN2013102973701A patent/CN103335979A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002016909A1 (en) * | 2000-08-18 | 2002-02-28 | The Government Of The United States Of America, As Represented By The Secretary Of The Navy | A method and apparatus for transverse load sensing by use of pi-phase shifted optical fiber |
| US20030219257A1 (en) * | 2002-03-06 | 2003-11-27 | Aston Photonic Technologies Limited | Generating electronic carrier signals in the optical domain |
| CN101483304A (en) * | 2009-02-25 | 2009-07-15 | 中国科学院上海光学精密机械研究所 | Distributed Bragg reflection type single-frequency fiber laser based on phase-shift fiber grating |
| CN101975752A (en) * | 2010-09-10 | 2011-02-16 | 山东大学 | Intracavity gas detection system and method based on wavelength scan |
| CN102359943A (en) * | 2011-06-23 | 2012-02-22 | 天津大学 | Photonic crystal fibre-optical air chamber active cavity absorption-type gas detection device |
| CN202260115U (en) * | 2011-10-28 | 2012-05-30 | 李国玉 | Linearly-tunable short straight cavity optical fiber laser |
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8928885B1 (en) | 2013-10-14 | 2015-01-06 | Beijing Information Science & Technology University | Gas detection system using semiconductor laser with feedback compensation by gas reference cavity |
| US9029819B2 (en) | 2013-10-14 | 2015-05-12 | Beijing Information Science & Technology University | Gas detection system using intracavity fiber laser with loop cavity having saturated absorption fiber |
| CN103558181A (en) * | 2013-11-06 | 2014-02-05 | 郑州光力科技股份有限公司 | Online monitoring system for sulfur hexafluoride switch |
| US9837785B2 (en) | 2015-02-10 | 2017-12-05 | Shenzhen University | Polarization laser sensor |
| WO2016127323A1 (en) * | 2015-02-10 | 2016-08-18 | 深圳大学 | Laser-based sensor |
| CN105067563A (en) * | 2015-07-09 | 2015-11-18 | 中国科学院上海光学精密机械研究所 | Open space gas average concentration measuring device and measuring method |
| CN105067563B (en) * | 2015-07-09 | 2017-12-15 | 中国科学院上海光学精密机械研究所 | Open space gas mean concentration measurement apparatus and measuring method |
| CN105699327A (en) * | 2016-03-11 | 2016-06-22 | 济南大学 | System and method for detecting laser based on micro-nano Er-doped fiber |
| CN105699327B (en) * | 2016-03-11 | 2018-10-19 | 济南大学 | A kind of detecting system and method for the laser based on micro-nano Er-doped fiber |
| CN105866069A (en) * | 2016-04-20 | 2016-08-17 | 北京信息科技大学 | Gas composition test system based on tunable fiber laser |
| CN105866069B (en) * | 2016-04-20 | 2018-11-27 | 北京信息科技大学 | A kind of gas componant test macro based on tunable optical fiber laser |
| CN108871419A (en) * | 2018-04-20 | 2018-11-23 | 南京航空航天大学 | More physical quantity optical fiber sensing systems, the control of its feedback loop and its detection method |
| CN108871419B (en) * | 2018-04-20 | 2023-11-07 | 南京航空航天大学 | Multi-physical-quantity optical fiber sensing system, feedback loop control thereof and detection method thereof |
| CN109115722A (en) * | 2018-06-22 | 2019-01-01 | 山东建筑大学 | A kind of highly sensitive phase demodulating optical fiber gas sensing system |
| CN109115722B (en) * | 2018-06-22 | 2023-10-31 | 山东建筑大学 | High-sensitivity phase demodulation optical fiber gas sensing system |
| CN114235743A (en) * | 2021-12-20 | 2022-03-25 | 武汉理工大学 | Hydrogen detection device based on phase shift grating temperature compensation technology |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103335979A (en) | High-sensitivity inner-cavity gas detector based on composite cavity optical fiber laser device | |
| Yang et al. | A review of all-optical photoacoustic spectroscopy as a gas sensing method | |
| CN101793570B (en) | Sensing method of optical-fiber Bragg grating laser device | |
| CN102628797B (en) | Active cavity gas detection system based on laser injection mode locking technology | |
| Chen et al. | Detection of SF6 gas decomposition component H2S based on fiber-optic photoacoustic sensing | |
| CN109115688B (en) | Optical fiber remote measuring type multifunctional gas leakage listening instrument and method | |
| Guo et al. | High-sensitivity silicon cantilever-enhanced photoacoustic spectroscopy analyzer with low gas consumption | |
| CN103487403A (en) | Fiber bragg grating combined optical fiber laser gas detection system with reference cavity compensation | |
| Liu et al. | Investigation of wavelength modulation and wavelength sweep techniques in intracavity fiber laser for gas detection | |
| CN108120525A (en) | Optical fiber grating temperature/strain sensing system and its demodulation method | |
| CN104792402B (en) | A kind of sound wave sense measuring device based on optical fiber sagnac interferometer | |
| CN102506906A (en) | Method and system for improving performance of distributed optical fiber sensing system based on phi-OTDR | |
| Arsad et al. | Intra-cavity spectroscopy using amplified spontaneous emission in fiber lasers | |
| Qi et al. | High-precision photoacoustic nitrogen dioxide gas analyzer for fast dynamic measurement | |
| CN207557107U (en) | A kind of cavity ring-down spectroscopy humidity measurement system based on intracavitary amplification | |
| Wang et al. | Wavelength scanning Q-switched fiber-ring laser intra-cavity QEPAS using a standard 32.76 kHz quartz tuning fork for acetylene detection | |
| Wang et al. | Multi-component and multi-point trace gas sensing in wavelength modulation spectroscopy based on wavelength stabilization | |
| Li et al. | Differential Cantilever Enhanced Fiber-Optic Photoacoustic Sensor for Diffusion Gas Detection | |
| Zhao et al. | Fiber-Optic Photoacoustic CO sensor for gas insulation equipment monitoring based on cantilever differential lock-in amplification and optical excitation enhancement | |
| CN108512024A (en) | Tunable single longitudinal mode optical-fiber laser, gas concentration detection apparatus and method | |
| Spagnolo et al. | Part-per-trillion level detection of SF6 using a single-mode fiber-coupled quantum cascade laser and a quartz enhanced photoacoustic sensor | |
| CN208385830U (en) | Tunable single longitudinal mode optical-fiber laser, gas concentration detection apparatus | |
| CN111693476A (en) | Hollow-core photonic crystal fiber gas sensor based on quantum enhancement | |
| CN103438916A (en) | Fiber grating wavelength demodulating device based on saturable absorption fiber | |
| CN110907400A (en) | Gas detection device based on micro-channel polarization-maintaining optical fiber Sagnac interference structure |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20131002 |