CN201237572Y - Optical detector for ethyne gas - Google Patents
Optical detector for ethyne gas Download PDFInfo
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- CN201237572Y CN201237572Y CN 200820086614 CN200820086614U CN201237572Y CN 201237572 Y CN201237572 Y CN 201237572Y CN 200820086614 CN200820086614 CN 200820086614 CN 200820086614 U CN200820086614 U CN 200820086614U CN 201237572 Y CN201237572 Y CN 201237572Y
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- acetylene
- laser
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Abstract
The utility model relates to optical detection device of acetylene gas, which consists of a signal generation device and a gas absorption cell; wherein, the signal generation device is connected with an adjustable laser device capable of being modulated by the signal generation device; light generated by the adjustable laser device is transmitted to a photoelectric detection device through the gas absorption cell; the photoelectric detection device is connected with an amplifying and adaptive device which is connected with a data collecting card device capable of carrying out an analog-to-digital conversion and data collection; the data collecting card device outputs sampling signals to a computer for processing data and outputting detection results. When laser beam passes through the gas absorption cell, the absorption strength can also be regulated by sinusoidal current signal as the absorption line is scanned by light wave frequency; the signal passing through the gas absorption cell is collected by a computer after detected by the photoelectric detection device and processed by the amplifying and adaptive device and outputs concentration information after processed by the computer. The optical detection device of acetylene gas has the advantages of wide application scope, accurate measurement, novel structure, and realizing real time dynamic monitoring.
Description
Technical field
The utility model relates to a kind of method and device that utilizes the method dynamic real-time detection acetylene gas of spectroscopy, relates in particular to the optical detection apparatus of acetylene gas.
Background technology
Acetylene gas all has application in many commercial production; it is the very active gas of a kind of chemical property, very easily burns, decomposes and explode, and the aerial explosive range of acetylene is 2.5%～80%; compare with other flammable explosive gas, the explosive range of acetylene is big, lower explosive limit is low.Thereby, acetylene gas monitored in real time have crucial meaning.In addition, before breaking down as the oil-filled transformer of the large-scale transmission facility in the electric power transfer, can volatilize several failure gas that comprise acetylene, therefore detect the concentration of this typical fault gas of acetylene in real time, can reach monitoring transformer duty, find the transformer latent fault ahead of time, thereby prevent the massive losses that the power outage that burns and cause of high-power transformer causes.Acetylene gas in the large-scale transmission transformer oil monitored in real time seem particularly important.
Present acetylene gas concentration detection method, commonly used have a semiconductor-type sensor method, the catalytic combustion type sensor detection method, their ubiquity precision are not high, and are low to the resolution of gaseous species, and the restriction in serviceable life is arranged, and poison shortcomings such as inefficacy easily.And the detection method that the oil-filled transformer failure gas is commonly used at present is the vapor-phase chromatography in the Physical Separation Technology, and the oil in the transformer is carried out the laggard circumstances in which people get things ready for a trip analysis of spectrum of gas-oil separation, provides the concentration of acetylene data.Its precision is very high, but that shortcoming is an analytical cycle is long, and a few minutes just can provide data at least, can't realize real-time dynamic monitoring.
Summary of the invention
Technical problem to be solved in the utility model is the present situation at prior art, and a kind of applied widely, optical detection apparatus of measuring accurately, can realizing the acetylene gas of real-time dynamic monitoring is provided.
According to quantum mechanics, acetylene gas at the 1525nm place by normal mode of vibration V
1And V
3Form the general frequency of vibration and absorb (V
1+ V
3), be called as R respectively according to two absorption peak spectrums about positive and negative the obtaining of rotating quantum and prop up with P and prop up.Choose a wherein single absorption peak of absorption coefficient maximum during measurement.Wavelength-modulated absorption spectrum technology (WMS, WavelengthModulation Spectroscopy) principle, linear sweep electric current and the tens of kHz frequency v of the tens of Hz that take place to produce by function
mThe superimposed signal of high frequency sinusoidal current, add in the direct drive electric current of diode laser.Because Distributed Feedback Laser output is single-mode laser, live width is 1MHz, and the half-breadth of the single absorption peak of acetylene has 900MHz.So the output light frequency of laser instrument also is subjected to the high frequency Sine Modulated when doing linear sweep, when laser beam was passed through gas absorption cell, along with the inswept absorption line of frequency of light wave, its absorption intensity also was subjected to high frequency modulated.Then, modulated the absorbing light signal and after photoelectric detector detects, send into the absorption spectrum that lock-in amplifier detects acetylene gas, and machine is handled back output concentration information as calculated.
The technical scheme that the prior art problem that solves the utility model is adopted is: the optical detection apparatus of acetylene gas, comprise signal generation apparatus and gas absorption cell, and wherein: signal generation apparatus is connected with the adjustable laser device that can be subjected to the signal generation apparatus modulation;
The light that the adjustable laser device produces is sent to photoelectric detection system by gas absorption cell; Photoelectric detection system is connected with the amplification adaptive device;
Amplify adaptive device and be connected with the data acquisition card device that can carry out analog to digital conversion and data acquisition;
Data acquisition card device output sampled signal is to the computing machine of handling data and output testing result.
For optimizing technique scheme, the technical measures of taking also comprise: signal generation apparatus comprises sinewave modulation signal generator and triangular modulation signal generator.
Amplify adaptive device and comprise at least one lock-in amplifier, and the amplification adaptive device also comprises the data acquisition card device; The data acquisition card device can be adaptive to carrying out between lock-in amplifier and the computing machine.
The adjustable laser device comprises laser temperature current controller and laser instrument; The laser temperature current controller can be controlled the electric current or the temperature of laser instrument under the modulation of signal generation apparatus.
The working temperature of adjustable laser device is 30 ℃ to 35 ℃; The output wavelength of adjustable laser device is 1529nm to 1531nm.
Laser instrument is a distributed feedback type semiconductor laser diode laser instrument.
Gas absorption cell can hold gas to be measured; In generation, surveys gas and comprises acetylene.
Photoelectric detection system comprises the PIN detector.
Calculate function and read the signal that sends that amplifies adaptive device, and handle, the output testing result signal collected.
Traditional chemistry and physical detection technology are a kind of Static Detection technology.Utilize tunable laser absorption spectrum technology can reflect the gas on-site situation in real time, and it is low to detect lower limit.Along with developing rapidly of semiconductor science and technology, little and the low price of semiconductor laser volume, the product development that utilizes this technology to carry out the acetylene gas concentration monitoring method has more the market competitiveness, can be widely used in the field that all need carry out dynamic real-time monitoring acetylene gas concentration.
Compared with prior art, the utility model has adopted signal generation apparatus to produce linear sweep electric current and the superimposed signal of sinusoidal current, adds in the direct drive electric current of adjustable laser device; The sinusoidal current signal that signal generation apparatus produces, adaptive device is amplified in input; The output light frequency of adjustable laser device also is subjected to the sinusoidal current modulation when doing linear sweep; When laser beam was passed through gas absorption cell, along with light wave is swept absorption line frequently, its absorption intensity also was subjected to the sinusoidal current signal modulation; Detect after amplify adaptive device through photoelectric detection system through the signal of gas absorption cell and to handle the back, and machine is handled the back and exported concentration information as calculated by computer acquisition.The beneficial effect of its generation is, can be installed in anyly has acetylene gas to reveal possible productive life place, carries out the concentration of acetylene dynamic real-time monitor; Or after the gas-oil separation of large-scale power transmission oil-immersed type transformer, to the acetylene failure gas concentration of transformer, carry out dynamic real-time and detect, play the effect that prevents trouble before it happens, reduce the burn-out rate of high-power transformer, and burn power outage that causes and the massive losses that causes thereof by high-power transformer.So the utlity model has applied widely, measure accurately, novel structure, can realize the advantage of real-time dynamic monitoring.
Description of drawings
Fig. 1 is the utility model embodiment synoptic diagram;
Fig. 2 is the theory diagram of wavelength-modulated absorption spectrum technology;
Fig. 3 is DFB LD modulation generating circuit figure;
Fig. 4 PIN photodetection and pre-amplification circuit figure;
Fig. 5 power circuit diagram;
Fig. 6 acetylene is in the absorption spectra at 1525nm place.
Embodiment
Embodiment describes in further detail the utility model below in conjunction with accompanying drawing.
Figure grade explanation: signal generation apparatus 1, adjustable laser device 2, gas absorption cell 3, photoelectric detection system 4, amplification adaptive device 5, computing machine 6, sinewave modulation signal generator 11, triangular modulation signal generator 12, laser temperature current controller 21, laser instrument 22, lock-in amplifier 51, data acquisition card device 52.
Select the infrared absorption peak of acetylene in the certain wave strong point, this service band moisture and other gases almost do not absorb, and make system have good selectivity, are not subjected to the interference of other compositions.Adopt then the very narrow semiconductor laser emission center wavelength of live width for this reason the laser of specific wavelength as incident light.Use the tunable within the specific limits advantage of semiconductor laser output wavelength simultaneously, change the output Wavelength of Laser by modulation, make its whole absorption spectra that can scan this centre wavelength of acetylene, improve measuring accuracy and the antijamming capability of laser wavelength drift.Pass through current-modulation, laser instrument output light modulated is injected the end that the on-the-spot sampling closed air chamber that is connected takes place with acetylene, through behind the light path of this air chamber, light signal in the outgoing of the air chamber other end contains gas concentration information, the line focus lens focus is to detector, through opto-electronic conversion, be transferred to computing machine after preposition amplification and the data acquisition and carry out signal Processing again, thus the detection of concentration of acetylene in the realization closed air chamber.
Shown in Figure 1 is the utility model embodiment synoptic diagram.
The optical detection apparatus of acetylene gas comprises signal generation apparatus 1 and gas absorption cell 3, and wherein: signal generation apparatus 1 is connected with the adjustable laser device 2 that can be subjected to signal generation apparatus 1 modulation;
The light that adjustable laser device 2 produces is sent to photoelectric detection system 4 by gas absorption cell 3; Photoelectric detection system 4 is connected with and amplifies adaptive device 5;
Amplify adaptive device 5 and be connected with the computing machine 6 that to handle and to export testing result.
Amplify adaptive device 5 and be connected with the data acquisition card device 52 that can carry out analog to digital conversion and data acquisition;
Data acquisition card device 52 output sampled signals are to the computing machine 6 of handling data and output testing result.
Amplify adaptive device 5 and comprise at least one lock-in amplifier 51, and amplification adaptive device 5 also comprises data acquisition card device 52; Data acquisition card device 52 can be adaptive to carrying out between lock-in amplifier 51 and the computing machine 6.Lock-in amplifier 51 with pre-amplification circuit is transformed into voltage signal with current signal and amplifies, and detects second harmonic signal then, sends into data acquisition card device 52 and gathers multichannel datas, and do the data preparation for the aftertreatment of computing machine 6.
The working temperature of adjustable laser device 2 is 30 ℃ to 35 ℃; The output wavelength of adjustable laser device 2 is 1529nm to 1531nm.
Fig. 2 is the theory diagram of wavelength-modulated absorption spectrum technology, after adjustable laser device 2 is handled through constant temperature, comprises that through the function generator of signal generation apparatus 1 sinewave modulation signal generator 11 and triangular modulation signal generator 12 carry out current-modulation.Modulated laser is through behind the gas absorption cell, become the light signal that carries gas concentration information and pass through photoelectric detection system 4, it is the PIN detector, be converted into electric signal, and with this realization I/V conversion of electric signal process pre-amplification circuit and voltage amplification, harmonic wave by lock-in amplifier 51 detects the second harmonic signal with gas concentration relation in direct ratio subsequently, and the second harmonic signal after at last A/D being transformed is gathered, storage and data processing, obtains gas concentration information.
Fig. 3 is DFB LD modulation generating circuit figure.
Fig. 4 PIN photodetection and pre-amplification circuit figure.
Fig. 5 power circuit diagram.
Fig. 6 acetylene is in the absorption spectra at 1525nm place, acetylene in the absorption spectra at 1525nm place as shown in Figure 1, wherein prop up for R in the left side, the right side is that P props up.
The course of work:
Chosen the 1530.371nm of the near-infrared band of acetylene gas in the HITRAN of Harvard University database, wave number is 6534.3636cm
-1Absorption line is as the output center wavelength of adjustable laser device 2.Because at near-infrared band, there is not the interference of other gas near the wavelength coverage.Earlier adjustable laser device 2 temperature are set in 32 ℃, the electric current adjustment makes adjustable laser device 2 be output as the 1530.371nm wavelength, and bandwidth is 1MHz.The signal generation apparatus 1 adding 10Hz triangular wave of current-modulation end and the superposed signal of 10KHz sine wave are sent into adjustable laser device 2 then, make DFB distributed feedback type semiconductor laser diode export light modulated, be converted into electric signal through the light signal that carries the acetylene gas concentration information behind the long gas absorption cell 3 of 500mm by photoelectric detection system 4, preferred InGaAs photodetector, and this electric signal is passed through pre-amplification circuit realize that I/V changes and voltage amplification send data acquisition card device 52 to gather, detect second harmonic signal with acetylene gas concentration relation in direct ratio by lock-in amplifier 51 simultaneously, the PIN amplifying signal after data acquisition card device 52 collection A/D transform and the second harmonic signal of phase-locked output, at last, 6 pairs of signal collected processing of computing machine, preference data capture card AD7200h obtains gas concentration information.
Most preferred embodiment of the present utility model is illustrated, and various variations or the remodeling made by those of ordinary skills can not break away from scope of the present utility model.
Claims (9)
1, the optical detection apparatus of acetylene gas comprises signal generation apparatus (1) and gas absorption cell (3), it is characterized in that: described signal generation apparatus (1) is connected with the adjustable laser device (2) that can be subjected to described signal generation apparatus (1) modulation;
The light that described adjustable laser device (2) produces is sent to described photoelectric detection system (4) by described gas absorption cell (3); Described photoelectric detection system (4) is connected with and amplifies adaptive device (5);
Described amplification adaptive device (5) is connected with the computing machine (6) that can handle and export testing result.
2, the optical detection apparatus of acetylene gas according to claim 1 is characterized in that: described signal generation apparatus (1) comprises sinewave modulation signal generator (11) and triangular modulation signal generator (12).
3, the optical detection apparatus of acetylene gas according to claim 2 is characterized in that: described amplification adaptive device (5) comprises at least one lock-in amplifier (51), and described amplification adaptive device (5) also comprises data acquisition card device (52); Described data acquisition card device (52) can be adaptive to carrying out between described lock-in amplifier (51) and the described computing machine (6).
4, the optical detection apparatus of acetylene gas according to claim 3 is characterized in that: described adjustable laser device (2) comprises laser temperature current controller (21) and laser instrument (22); Described laser temperature current controller (21) can be controlled the electric current or the temperature of laser instrument (22) under the modulation of signal generation apparatus (1).
5, the optical detection apparatus of acetylene gas according to claim 4 is characterized in that: the working temperature of described adjustable laser device (2) is 30 ℃ to 35 ℃; The output wavelength of described adjustable laser device (2) is 1529nm to 1531nm.
6, the optical detection apparatus of acetylene gas according to claim 5 is characterized in that: described laser instrument (22) is a distributed feedback type semiconductor laser diode laser instrument.
7, the optical detection apparatus of acetylene gas according to claim 5 is characterized in that: described gas absorption cell (3) can hold gas to be measured; In described generation, surveys gas and comprises acetylene.
8, the optical detection apparatus of acetylene gas according to claim 5 is characterized in that: described photoelectric detection system (4) comprises the PIN detector.
9, according to the optical detection apparatus of the described acetylene gas of the arbitrary claim of claim 6 to 8, it is characterized in that: described computing machine (6) can read the signal that sends of described amplification adaptive device (5), and handle the output testing result to signal collected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200820086614 CN201237572Y (en) | 2008-04-30 | 2008-04-30 | Optical detector for ethyne gas |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200820086614 CN201237572Y (en) | 2008-04-30 | 2008-04-30 | Optical detector for ethyne gas |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102809547A (en) * | 2012-08-28 | 2012-12-05 | 昆山昱翌辉华电子科技有限公司 | Method and device for detecting trace gas by scattering-enhanced tunable diode laser |
| CN104198433A (en) * | 2014-09-14 | 2014-12-10 | 中国科学院合肥物质科学研究院 | Device and method for detecting concentration of human respiration marking gas on line by laser absorption spectroscopy technology |
| CN104297207A (en) * | 2014-10-22 | 2015-01-21 | 深圳市唯锐科技有限公司 | TDLAS based laser expiration analyzer and system |
| CN105806806A (en) * | 2016-05-12 | 2016-07-27 | 河南省日立信股份有限公司 | TDLAS based escaped ammonia concentration detection device and method |
| CN105806805A (en) * | 2016-04-29 | 2016-07-27 | 河南省日立信股份有限公司 | Extensible test platform based on tunable semiconductor laser absorption spectrum technology |
-
2008
- 2008-04-30 CN CN 200820086614 patent/CN201237572Y/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102809547A (en) * | 2012-08-28 | 2012-12-05 | 昆山昱翌辉华电子科技有限公司 | Method and device for detecting trace gas by scattering-enhanced tunable diode laser |
| CN104198433A (en) * | 2014-09-14 | 2014-12-10 | 中国科学院合肥物质科学研究院 | Device and method for detecting concentration of human respiration marking gas on line by laser absorption spectroscopy technology |
| CN104297207A (en) * | 2014-10-22 | 2015-01-21 | 深圳市唯锐科技有限公司 | TDLAS based laser expiration analyzer and system |
| CN105806805A (en) * | 2016-04-29 | 2016-07-27 | 河南省日立信股份有限公司 | Extensible test platform based on tunable semiconductor laser absorption spectrum technology |
| CN105806806A (en) * | 2016-05-12 | 2016-07-27 | 河南省日立信股份有限公司 | TDLAS based escaped ammonia concentration detection device and method |
| CN105806806B (en) * | 2016-05-12 | 2019-04-30 | 河南省日立信股份有限公司 | A kind of escape ammonia concentration detection apparatus and method based on TDLAS technology |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090513 Termination date: 20100430 |