CN104792703A - Laser multiple reflection photoacoustic spectroscopy technology-based aerosol optical absorption coefficient detection apparatus - Google Patents
Laser multiple reflection photoacoustic spectroscopy technology-based aerosol optical absorption coefficient detection apparatus Download PDFInfo
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Abstract
The invention provides a laser multiple reflection photoacoustic spectroscopy technology-based aerosol optical absorption coefficient detection apparatus. Laser passes through an optical isolator and an optoacoustic cell and is reflected by a first reflector, reflected laser passes through the optoacoustic cell and the optical isolator and is reflected by a second reflector, newly obtained reflected laser passes through the optical isolator and the optoacoustic cell and is reflected by the first reflector, the reflected laser passes through the optoacoustic cell and the optical isolator and then is output, a lock-in amplifier is connected with a microphone and a signal generator, and an optoacoustic signal is extracted from noises and is counted by a computer to obtain the absorption coefficient of aerosol. A technical problem that the influences of insufficient utilization of laser power on the detection precision of photoacoustic spectroscopy technology-based aerosol optical absorption coefficient detection apparatuses in the prior art is solved in the invention. Multiple reflection of the laser is carried out in the optoacoustic cell, so the laser power in the optoacoustic cell is improved without improving the laser output power; and the sensitivity of the amplitude enhancement detection apparatus of the optoacoustic signal is improved.
Description
Technical field
The present invention relates to environment, meteorological observation device, especially relate to a kind of detection device for optical absorption coefficient of aerosol of optoacoustic spectroscopy.
Background technology
Gasoloid has extinction effect, can absorb and scattering sunshine, causes the sunshine arriving ground to reduce, thus reduces atmospheric temperature, affect global climate.Gasoloid can cause atmospheric visibility to reduce, and directly affects traffic safety.The concentration of aerocolloidal absorption coefficient and black carbon is closely related simultaneously, can study aerocolloidal composition by aerocolloidal absorption coefficient.Therefore study detection device for optical absorption coefficient of aerosol tool to be of great significance.
Current aerocolloidal absorption coefficient adopts black carbon instrument to carry out black concentration of carbon measurement usually, and then obtains gasoloid absorption coefficient.Black carbon instrument adopts the uniform quartz fibre film of printing opacity to gather atmospheric aerosol sample, the absorption coefficient of black carbon is measured after enrichment after a while, and then obtaining the concentration of black carbon in gasoloid, black concentration of carbon is multiplied by the absorption coefficient that certain coefficient just can obtain atmospheric aerosol.But black carbon instrument Measuring Time is longer, often needs a few minutes to dozens of minutes, can not realize real-time measurement.Black carbon instrument is not directly measure gasoloid absorption coefficient simultaneously, needs just can obtain gasoloid absorption coefficient by converting, and there is certain error.
Gasoloid absorption coefficient can adopt optoacoustic spectroscopy to realize directly, in real time measuring.Optoacoustic spectroscopy is based on optoacoustic effect, and after Absorption of Medium luminous energy, temperature raises, and after not absorbing luminous energy, temperature reduces.Incident light is carried out in audio range the periodic modulation of light intensity or wavelength, medium temperature generating period is changed, thus produce sound wave, in photoacoustic cell, just can be obtained the absorption coefficient of medium by detection photoacoustce signal intensity.Absorption coefficient, the luminous power of photoacoustce signal intensity and medium are directly proportional.Chinese patent application publication No. CN103604752A, February 26 2014 Shen Qing Publication day, name is called the patent of invention open file of " detection device for optical absorption coefficient of aerosol based on optoacoustic spectroscopy ", the disclosed gasoloid absorption coefficient pick-up unit based on optoacoustic spectroscopy, comprises laser instrument, electro-optic intensity modulator, photoacoustic cell, photodetector, microphone, prime amplifier, lock-in amplifier, computer and signal generator; The light that laser instrument sends, by after electro-optic intensity modulator, photoacoustic cell, impinges perpendicularly on photodetector, and the signal wire of photodetector is connected with the computer that data collecting card is housed; The signal wire of signal generator is connected with the reference signal end of lock-in amplifier with electro-optic intensity modulator respectively; The microphone signal line be contained in photoacoustic cell is connected with the input end of prime amplifier, and the output terminal of prime amplifier is connected with the detection signal end of lock-in amplifier, and the signal output part of lock-in amplifier is connected with computer.This technical scheme adopts electrooptical modulation to modulate laser intensity, improves the signal to noise ratio (S/N ratio) of system.By detecting the amplitude of photoacoustic signal, the absorption coefficient of light of aerosol particle under certain wavelength can be calculated.But a laser once-through photoacoustic cell, do not make full use of laser power, the amplitude of photoacoustic signal is low, and the measurement sensistivity of pick-up unit is not high, affects accuracy of detection.
Summary of the invention
The detection device for optical absorption coefficient of aerosol based on optoacoustic spectroscopy existed to solve prior art does not make full use of laser power, the amplitude of photoacoustic signal is low, affect the technical matters of accuracy of detection, the invention provides a kind of detection device for optical absorption coefficient of aerosol based on laser multiple reflections optoacoustic spectroscopy, make laser multiple reflections in photoacoustic cell, reach the laser power that improve in photoacoustic cell, and then improve the amplitude of photoacoustic signal, improve the object of the measurement sensistivity of pick-up unit.
Technical scheme of the present invention is: a kind of detection device for optical absorption coefficient of aerosol based on laser multiple reflections optoacoustic spectroscopy, it comprises generating laser, lock-in amplifier, photoacoustic cell, first catoptron, second catoptron, optical isolator, the laser of laser transmitter projects injects the first catoptron through optical isolator and photoacoustic cell, the laser of the first catoptron reflection injects the second catoptron through photoacoustic cell and optical isolator, the laser of the second catoptron reflection injects the first catoptron again through optical isolator and photoacoustic cell, laser isolation and amplifier after photoacoustic cell and optical isolator of the first catoptron secondary reflection again, photoacoustic cell is connected with microphone, microphone is electrically connected with lock-in amplifier, lock-in amplifier is electrically connected with signal generator and computing machine respectively.Adopting optical isolator to realize laser multiple reflections in photoacoustic cell, when not improving laser output power, improving photoacoustic cell inner laser power, and then improve the amplitude of photoacoustic signal, improve the measurement sensistivity of pick-up unit.
As preferably, optical isolator comprises quarter wave plate, first polaroid, 45 ° of Faraday polarization apparatus, 1/2 wave plate, second polaroid, generating laser output line polarization p light, successively through the second polaroid, 1/2 wave plate and 45 ° of Faraday polarization apparatus become polarization p light, polarization p light becomes rotatory polarization through the first polaroid and quarter wave plate successively, rotatory polarization returns again through photoacoustic cell through being reflected by the first catoptron after photoacoustic cell, linear polarization s light is become through quarter wave plate, linear polarization s light is passed back through quarter wave plate by the second catoptron reflection becomes rotatory polarization, rotatory polarization returns again through photoacoustic cell through being reflected by the first catoptron after photoacoustic cell, linear polarization p light is become from rotatory polarization through quarter wave plate, linear polarization p light is through the first polaroid, through 45 ° of Faraday polarization apparatus, again through 1/2 wave plate, become linear polarization s light, output is reflected during linear polarization s light directive the second polaroid.Realize an Emission Lasers, pass through photoacoustic cell four times.
As preferably, there is the periodic signal consistent with photoacoustic cell resonant frequency in signal generator.
As preferably, generating laser is modulated by signal generator; The laser of generating laser output intensity periodic adjustment.
Generating laser can also adopt the generating laser comprising light intensity modulator, and generating laser exports continuous laser after light intensity modulator modulation, the laser of output intensity periodic modulation.
Compared with prior art, the invention has the beneficial effects as follows: adopt optical isolator to realize laser multiple reflections in photoacoustic cell, when not improving laser output power, improving photoacoustic cell inner laser power; Photoacoustic signal is proportional to photoacoustic cell inner laser power, thus improves the amplitude of photoacoustic signal, improves the measurement sensistivity of pick-up unit.
Accompanying drawing explanation
Accompanying drawing 1 is schematic diagram of the present invention;
Accompanying drawing 2 is photoacoustic cell structural representation.
In figure: 1-generating laser; 2-signal generator; 3-lock-in amplifier; 4-computing machine; 5-photoacoustic cell; 8-optical isolator; 51-microphone; The right buffer air chamber of 52-; The right diaphragm of 53-; 54-gas outlet; 55-resonant cavity; 56-air intake opening; 57-left window sheet; The left buffer air chamber of 58-; 61-first catoptron; 62-second catoptron; 71-the one 45 ° of catoptron; 72-the 2 45 ° of catoptron; 81-1/4 wave plate; 83-45 ° of Faraday polarization apparatus; 84-1/2 wave plate; 821-first polaroid; 822-second polaroid.
Embodiment
Below by embodiment, and by reference to the accompanying drawings, technical scheme of the present invention is described in further detail.
Embodiment 1:
As illustrated in fig. 1 and 2, in figure, dotted line represents light path, and arrow represents optical path direction; Fine line represents electrical connection.Based on a detection device for optical absorption coefficient of aerosol for laser multiple reflections optoacoustic spectroscopy, it comprises generating laser 1, signal generator 2, lock-in amplifier 3, computing machine 4, photoacoustic cell 5, first catoptron 61, second catoptron the 62, the 1 ° of catoptron 71; 2 45 ° of catoptron 72, optical isolator 8.The laser that generating laser 1 is launched injects the first catoptron 61 through optical isolator 8 and photoacoustic cell 5.The laser that first catoptron 61 reflects injects the second catoptron 62 through photoacoustic cell 5 and optical isolator 8.The laser that second catoptron 62 reflects injects the first catoptron 61 again through optical isolator 8 and photoacoustic cell 5.Laser isolation and amplifier after photoacoustic cell 5 and optical isolator 8 of the first catoptron 61 secondary reflection again.First catoptron 61 and the second catoptron 62 are 0 ° of catoptron.Optical isolator 8 comprises quarter wave plate 81, first polaroid 821,45 ° of Faraday polarization apparatus 83,1/2 wave plate 84, second polaroids 822.Photoacoustic cell 5 comprises microphone 51, right buffer air chamber 52, right diaphragm 53, gas outlet 54, resonant cavity 55, air intake opening 56, left window sheet 57, left buffer air chamber 58.Resonant cavity 55 is cylindrical cavity, has the amplification realizing photoacoustic signal.Cylindrical cavity center section has aperture, detects photoacoustic signal for placing microphone 5.Resonant cavity 55 two ends are communicated with left buffer air chamber 58 with right buffer air chamber 52 respectively.Air intake opening 56 is communicated with left buffer air chamber 58; Gas outlet 54 is communicated with right buffer air chamber 52.Generating laser 1 output wavelength is the laser of 532nm.Laser intensity is modulated by signal generator 2, and the frequency that sinusoidal signal occurs signal generator 2 is consistent with photoacoustic cell 5 resonant frequency., after being reflected by the 2 45 ° of catoptron 72, be there are 45 ° of rotations through the second polaroid 822 and 1/2 wave plate 84 rear polarizer direction successively, after 45 ° of Faraday polarization apparatus 83, again become polarization p light in generating laser 1 emission line polarization p light.Polarization p light is turned into rotatory polarization through the first polaroid 821 and quarter wave plate 81 by line polarisation successively.Rotatory polarization, after the one 45 ° of catoptron 71 reflects, enters left buffer air chamber 58 by left window sheet 57, enters right buffer air chamber 52 through resonant cavity 55, penetrate from right diaphragm 53, and laser alignment is once through photoacoustic cell 5.Rotatory polarization, after the first catoptron 61 reflects, enters right buffer air chamber 52 by right diaphragm 53, enters left buffer air chamber 58, penetrate from left window sheet 57 through resonant cavity 55, and laser alignment secondary is through photoacoustic cell 5.The rotatory polarization of reflection, after the one 45 ° of catoptron 71 reflects, becomes linear polarization s light through quarter wave plate 81 from rotatory polarization.Linear polarization s light is reflexed to the second catoptron 62 by the first polaroid 821, after being reflected after the first polaroid 821 reflects through quarter wave plate 81, becomes rotatory polarization from polarization s light by the second catoptron 62.Rotatory polarization is after catoptron 71 reflects, and third time is through photoacoustic cell 5.Rotatory polarization is after the first catoptron 61 reflects, and the 4th time through photoacoustic cell 5.The rotatory polarization of reflection, after the one 45 ° of catoptron 71 reflects, after quarter wave plate 81, becomes linear polarization p light from rotatory polarization.Linear polarization p light rotates 45 ° through the first polaroid 821 through 45 ° of Faraday polarization apparatus 83 polarization directions, more again rotates 45 ° through 1/2 wave plate 84 polarization direction, becomes linear polarization s light.Reflected output during linear polarization s light directive the second polaroid 822, prevent laser from refilling laser emitter 1.Microphone 51 is electrically connected with lock-in amplifier 3, and lock-in amplifier 3 is electrically connected with signal generator 2 and computing machine 4 respectively.Generating laser 1 is modulated by signal generator 2.There is the periodic signal consistent with photoacoustic cell 5 resonant frequency in signal generator 2.Signal generator 2 produces cyclical signal, for modulated laser transmitter 1 and as reference signal input lock-in amplifier 3.Generating laser 1 modulates the laser of direct output intensity periodic modulation by periodic signal.Or generating laser can also adopt structure: generating laser 1 comprises light intensity modulator.Generating laser 1 exports continuous laser, then after light intensity modulator modulation, the laser of output intensity periodic modulation.Tested gasoloid is drawn in photoacoustic cell 5 by air intake opening 56, absorbs the laser power of periodic modulation, produces photoacoustic signal, is detected, extracted by photoacoustic signal through lock-in amplifier 3 from noise after resonant cavity 55 resonates amplification by microphone 51.Photoacoustic signal S
pA=S
mc
cellaPc, S
mfor sensitivity of microphone, C
cellfor pond constant, a is absorption coefficient, and c is tested aerosol concentration, and P is photoacoustic cell inner laser power.Photoacoustic signal is proportional to photoacoustic cell inner laser power, when not improving laser output power, adopt optical isolator 8 to realize laser multiple reflections in photoacoustic cell 5, improve photoacoustic cell inner laser power, thus improve the amplitude of photoacoustic signal, improve the measurement sensistivity of pick-up unit.Photoacoustic signal is exported to computing machine 6 by lock-in amplifier 3, asks for optical absorption coefficient of aerosol.
Claims (5)
1. the detection device for optical absorption coefficient of aerosol based on laser multiple reflections optoacoustic spectroscopy, it comprises generating laser (1), lock-in amplifier (3), photoacoustic cell (5), first catoptron (61), second catoptron (62), optical isolator (8), it is characterized in that: the laser that described generating laser (1) is launched injects the first catoptron (61) through optical isolator (8) and photoacoustic cell (5), the laser that first catoptron (61) reflects injects the second catoptron (62) through photoacoustic cell (5) and optical isolator (8), the laser that second catoptron (62) reflects injects the first catoptron (61) again through optical isolator (8) and photoacoustic cell (5), laser isolation and amplifier after photoacoustic cell (5) and optical isolator (8) of the first catoptron (61) secondary reflection again, described photoacoustic cell (5) is connected with microphone (51), microphone (51) is electrically connected with lock-in amplifier (3), described lock-in amplifier (3) is electrically connected with signal generator (2) and computing machine (4) respectively.
2. the detection device for optical absorption coefficient of aerosol based on laser multiple reflections optoacoustic spectroscopy according to claim 1, it is characterized in that: described optical isolator (8) comprises quarter wave plate (81), first polaroid (821), 45 ° of Faraday polarization apparatus (83), 1/2 wave plate (84), second polaroid (822), generating laser (1) output line polarization p light, successively through the second polaroid (822), 1/2 wave plate (84) and 45 ° of Faraday polarization apparatus (83) become polarization p light, polarization p light becomes rotatory polarization through the first polaroid (821) and quarter wave plate (81) successively, rotatory polarization returns again through photoacoustic cell (5) through being reflected by the first catoptron (61) after photoacoustic cell (5), linear polarization s light is become through quarter wave plate (81), linear polarization s light is passed back through quarter wave plate (81) by the second catoptron (62) reflection becomes rotatory polarization, rotatory polarization returns again through photoacoustic cell (5) through being reflected by the first catoptron (61) after photoacoustic cell (5), linear polarization p light is become from rotatory polarization through quarter wave plate (81), linear polarization p light is through the first polaroid (821), through 45 ° of Faraday polarization apparatus (83), again through 1/2 wave plate 84, become linear polarization s light, output is reflected time linear polarization s light directive second polaroid (822).
3. the detection device for optical absorption coefficient of aerosol based on laser multiple reflections optoacoustic spectroscopy according to claim 1, is characterized in that: the periodic signal consistent with photoacoustic cell (5) resonant frequency occurs described signal generator (2).
4. the detection device for optical absorption coefficient of aerosol based on laser multiple reflections optoacoustic spectroscopy according to claim 1 or 2 or 3, is characterized in that: generating laser (1) is modulated by signal generator (2).
5. the detection device for optical absorption coefficient of aerosol based on laser multiple reflections optoacoustic spectroscopy according to claim 1 or 2 or 3, it is characterized in that: generating laser (1) comprises light intensity modulator, generating laser (1) exports continuous laser after light intensity modulator modulation, the laser of output intensity periodic modulation.
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| CN110006828A (en) * | 2019-04-26 | 2019-07-12 | 哈尔滨工业大学 | A kind of device and method improving optoacoustic spectroscopy trace-gas sensors performance |
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| CN116539535A (en) * | 2023-04-14 | 2023-08-04 | 华南师范大学 | Photoacoustic cell, system and method for aerosol acidity detection |
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