CN104251819A - Photoacoustic spectrometry gas detection apparatus based on infrared light source - Google Patents
Photoacoustic spectrometry gas detection apparatus based on infrared light source Download PDFInfo
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- CN104251819A CN104251819A CN201310256245.6A CN201310256245A CN104251819A CN 104251819 A CN104251819 A CN 104251819A CN 201310256245 A CN201310256245 A CN 201310256245A CN 104251819 A CN104251819 A CN 104251819A
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Abstract
A disclosed photoacoustic spectrometry gas detection apparatus based on an infrared light source employs an infrared light source as an emission light source, and the infrared light source has the advantages of low cost and wide spectrum compared with a laser source, so that the preparation cost of a photoacoustic spectrometry gas analyzer is substantially reduced, the limitation that a laser source gas analyzer only can detect multiple gases, and the apparatus is capable of performing concentration detection on all gases having relatively high absorption in an used infrared light source emission spectrum scope. Cascade bunching is performed by using a concave mirror and a lens group, and finally a fine parallel light beam with relatively high power density is obtained. On the aspect of signal acquisition, an infrared-tube detection light modulation frequency is taken as a reference signal and input a lock-in amplifier, and is compared with a photoacoustic signal obtained by a rheomicrophone in terms of filter wave, and finally a gas concentration is obtained by using a computer to perform analytical calculation on the filter wave signal. The apparatus realizes low-cost high-selectivity high-sensitivity gas detection technology and has extremely good social and economic benefit.
Description
Art
The invention belongs to gas sensor domain, be specifically related to a kind of gas-detecting device that can carry out Concentration Testing based on infrared light supply and optoacoustic spectroscopy to multiple gases.
Background technology
Gas detection technology is widely used in the fields such as environment measuring, medical diagnosis, chemical industry chemistry and transformer fault diagnosis hotter in recent years, thus, in recent years the Sensitive Detection of trace gas is become to the research emphasis of recent domestic scholar.Optoacoustic spectroscopy is a kind of spectral technique utilizing optoacoustic effect to detect assimilate concentration, due to its high sensitivity, high selectivity, Larger Dynamic sensing range with the outstanding advantages such as multiple gases composition can be measured in real time, be subject to the growing interest of researchers and be progressively widely applied to the gas detect in industry-by-industry field.
Optoacoustic spectroscopy belongs to a kind of spectral measurement methods without background, there is detection sensitivity high, the responsiveness of the large and optoacoustic spectroscopy detector of dynamic range is the advantage such as irrelevant with wavelength almost, different from traditional spectral method of detection, photoacoustic technique is the part energy showed with acoustic pressure form in the heat energy produced after inspected object absorbs luminous energy, and at 20 century 70s along with the continuous accumulation of leptophonia signal detection technique and development, the appearance of high sensitivity microphone and piezoelectric ceramics, optoacoustic spectroscopy (PAS) technology is paid attention to widely, especially in trace gas detection, PAS technology obtains research and development widely, even if therefore when high reverse--bias weak absorbing, very little absorption can also can be detected by sound wave detector.
But the optoacoustic spectroscopy gas analyzer developed now uses laser as light source mostly, launching spectrum width while cost is higher also has great restriction, thus limits detected gaseous species.
Summary of the invention
In order to overcome above-mentioned the deficiencies in the prior art, the invention provides a kind of optoacoustic spectroscopy gas-detecting device based on infrared light supply, Concentration Testing can be carried out to multiple gases.Utilize the cheapness of infrared light supply and wide spectral feature, can degree save contracting gas analyzer cost and realize multiple gases detection greatly.
The technical solution adopted for the present invention to solve the technical problems:
Apparatus of the present invention divide four modules: light source module, PA cell module, signal acquisition module.
Light source module: use aluminium film concave mirror to converge infrared light supply divergent beams, select a focal length to be the convex lens of 10cm and two focal lengths to be the convex lens composition lens combination of 2cm to carry out cascade to light and collect collimation, it puts in order as 2cm focal length lenses-10cm focal length lenses-2cm focal length lenses, light beam after collecting becomes the directional light that width is about 40mm, and after mating plate filtering, light beam enters to inject photoacoustic cell after filtration.
PA cell module: described resonator cavity is column type, and both sides are communicated with coaxial surge chamber, resonator is long is 10cm, and chamber internal diameter is 1.4cm, and surge chamber length is 5cm, and surge chamber diameter is 5cm.PA cell incidence end fit high transmission quartz, tail end place silvered mirror, formed primary event.
Signal acquisition module: top, resonator cavity centre position fits tightly microphone.Microphone output terminal connects prime amplifier, then is connected with SR830 model lock-in amplifier, and last lock-in amplifier is connected with PC and carries out data analysis.
Beneficial effect: the principle that the present invention is based on optoacoustic spectroscopy gas detect, use low cost infrared light supply, devise the good optoacoustic spectroscopy gas-detecting device of sensitivity, this device avoids expensive laser beam emitting device, and cost obtains joint contracting, and structure is relatively simple, reliable, maintainability is good, due to the wide spectral characteristics of infrared light supply, can easily detect multiple gases.
Accompanying drawing explanation
Fig. 1 is photoacoustic spectroscopy gas detecting system structural drawing of the present invention.
Wherein: 1, infrared light supply, 2, concave mirror, 3, thick convex lens, 4, thin convex lens, 5, thick convex lens, 6, surge chamber, 7, air intake opening, 8, resonator cavity, 9, gas outlet, 10, catoptron, 11, microphone, 12, filter disc, 13, chopper, 14, DSP, 15, brshless DC motor, 16, prime amplifier, 17, lock-in amplifier, 18, computing machine, 19, infrared tube.
Embodiment
Below in conjunction with accompanying drawing and specific implementation process, the present invention is described in further details, but protection scope of the present invention is not limited to following embodiment.
As shown in Figure 1, whole gas-detecting device divides three large modules: light source module, PA cell module, signal acquisition module.
Light source adopts JSIR450 model stable state infrared light supply 1, its output wavelength covers 500-10000nm, meet multiple gases and measure required illumination wavelength, its divergent beams are undertaken converging by concave mirror 2 and are that the convex lens 3 of 2cm converge collimation through focal length, the beam and focus obtained is larger, therefore the convex lens 4 being 10cm by focal length again collect and the convex lens being 2cm by focal length again converge collimation, obtain the directional light that width is 4mm.
Thereafter light path is provided with filter disc 12 and chopper 13 carries out filtering and optical modulation again.DSP14 controls brshless DC motor 15 and drives chopper, and then control chopper 13 chopping frequency is modulated light.
Filter disc 12 establishes 6 Filter mosaic holes, chooses suitable optical filter install according to gas to be measured.
The chopping frequency of chopper is 1643HZ, is formed resonate with PA cell, amplifies acoustic signals.
Resonator cavity 8 is column type, and adopt brass material, both sides are communicated with coaxial surge chamber 6, and resonator cavity 8 chamber is long is 10cm, and chamber internal diameter is 1.4cm, and surge chamber 6 length is 5cm, and diameter is 5cm.PA cell incidence end fit high transmission quartz, tail end place silvered mirror 10, formed primary event.
Microphone 11EK-3303 is close in resonator cavity centre position, converts acoustical signal to electric signal, inputs two-phase lock-in amplifier 17 via prime amplifier 16, and its model is SR830, and reference signal detects light modulation frequency by infrared tube 19 and inputs lock-in amplifier 17.Finally collect signal by computing machine to carry out calculating corresponding gas concentration.
Claims (8)
1. can carry out a gas-detecting device for Concentration Testing based on infrared light supply and optoacoustic spectroscopy to multiple gases, comprise:
(1) light source;
(2) light beam focussed collimated unit;
(3) filtering copped wave unit;
(4) PA cell;
(5) signal gathering unit;
It is characterized in that: transmitting illuminant uses infrared light supply; Use concave mirror+lens combination to carry out cascade to diverging light to collect, PA cell is the column type resonance light operatic tunes, and signal acquisition module uses EK-3303 microphone, SR830 lock-in amplifier.
2. a kind of optoacoustic spectroscopy gas-detecting device based on infrared light supply according to claim 1, is characterized in that transmitting illuminant is infrared light supply.
3. a kind of optoacoustic spectroscopy gas-detecting device based on infrared light supply according to claim 1, is characterized in that using concave mirror+lens combination to carry out cascade to light first collects.
4. a kind of optoacoustic spectroscopy gas-detecting device based on infrared light supply according to claim 1, is characterized in that using infrared tube to obtain optical modulation information.
5. a kind of optoacoustic spectroscopy gas-detecting device based on infrared light supply according to claim 1, it is characterized in that PA cell incidence end fit high transmission quartz.
6. a kind of optoacoustic spectroscopy gas-detecting device based on infrared light supply according to claim 1, is characterized in that PA cell tail end places silvered mirror.
7. a kind of optoacoustic spectroscopy gas-detecting device based on infrared light supply according to claim 1, is characterized in that using brshless DC motor to drive chopper to carry out optical modulation.
8. a kind of optoacoustic spectroscopy gas-detecting device based on infrared light supply according to claim 1, is characterized in that filter is the filter disc containing 6 Filter mosaic holes.
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| CN201310256245.6A CN104251819A (en) | 2013-06-26 | 2013-06-26 | Photoacoustic spectrometry gas detection apparatus based on infrared light source |
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| CN201310256245.6A CN104251819A (en) | 2013-06-26 | 2013-06-26 | Photoacoustic spectrometry gas detection apparatus based on infrared light source |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105548024A (en) * | 2016-01-14 | 2016-05-04 | 湖北索瑞电气有限公司 | Photoacoustic spectrometry gas detection device based on pulse infrared light source |
| CN108226050A (en) * | 2018-03-02 | 2018-06-29 | 苏州感闻环境科技有限公司 | A kind of resonant mode photoacoustic cell for the detection of gas optoacoustic spectroscopy |
| CN108562546A (en) * | 2018-04-10 | 2018-09-21 | 大连理工大学 | A kind of detecting instrument and method of the miniaturization enhanced Laser Photoacoustic Spectroscopy of multiple reflections formula photoacoustic cell |
| CN109269999A (en) * | 2018-11-27 | 2019-01-25 | 国网重庆市电力公司电力科学研究院 | A kind of infrared photoacoustic spectra detection system |
| CN109490216A (en) * | 2019-01-07 | 2019-03-19 | 大连理工大学 | A kind of the Laser Photoacoustic Spectroscopy trace gas detection instrument and method of calibration-free |
| CN109724919A (en) * | 2017-10-27 | 2019-05-07 | 曲阜师范大学 | Multicomponent Pollution Gas detection light acousto-optic spectral apparatus based on solar tracking |
| CN110006835A (en) * | 2018-01-05 | 2019-07-12 | 英飞凌科技股份有限公司 | System and method for estimating gas concentration |
| CN111007014A (en) * | 2019-11-20 | 2020-04-14 | 东北大学 | First-order longitudinal full-resonance ellipsoidal cylindrical photoacoustic cell |
| CN111323376A (en) * | 2020-04-16 | 2020-06-23 | 中国科学院电工研究所 | Parallel incidence infrared thermal radiation photoacoustic spectrum gas sensing device |
| CN111504910A (en) * | 2020-04-23 | 2020-08-07 | 山东大学 | High signal-to-noise ratio photoacoustic cell based on photoacoustic effect and photoacoustic signal detection device |
| CN112274113A (en) * | 2020-11-25 | 2021-01-29 | 广东普洛宇飞生物科技有限公司 | Photoacoustic cell detection device and cell detection method |
| CN112315430A (en) * | 2020-11-25 | 2021-02-05 | 广东普洛宇飞生物科技有限公司 | Cell detection apparatus and cell detection method |
| CN112683835A (en) * | 2020-12-18 | 2021-04-20 | 上海集成电路研发中心有限公司 | Mixed gas detection device and system |
| CN113607650A (en) * | 2021-06-22 | 2021-11-05 | 南方电网科学研究院有限责任公司 | Gas detection device |
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- 2013-06-26 CN CN201310256245.6A patent/CN104251819A/en active Pending
Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105548024A (en) * | 2016-01-14 | 2016-05-04 | 湖北索瑞电气有限公司 | Photoacoustic spectrometry gas detection device based on pulse infrared light source |
| CN109724919A (en) * | 2017-10-27 | 2019-05-07 | 曲阜师范大学 | Multicomponent Pollution Gas detection light acousto-optic spectral apparatus based on solar tracking |
| CN110006835B (en) * | 2018-01-05 | 2023-10-20 | 英飞凌科技股份有限公司 | System and method for estimating gas concentration |
| CN110006835A (en) * | 2018-01-05 | 2019-07-12 | 英飞凌科技股份有限公司 | System and method for estimating gas concentration |
| CN108226050A (en) * | 2018-03-02 | 2018-06-29 | 苏州感闻环境科技有限公司 | A kind of resonant mode photoacoustic cell for the detection of gas optoacoustic spectroscopy |
| CN108562546A (en) * | 2018-04-10 | 2018-09-21 | 大连理工大学 | A kind of detecting instrument and method of the miniaturization enhanced Laser Photoacoustic Spectroscopy of multiple reflections formula photoacoustic cell |
| CN109269999A (en) * | 2018-11-27 | 2019-01-25 | 国网重庆市电力公司电力科学研究院 | A kind of infrared photoacoustic spectra detection system |
| CN109490216B (en) * | 2019-01-07 | 2021-02-19 | 大连理工大学 | Calibration-free laser photoacoustic spectrum trace gas detection instrument and method |
| CN109490216A (en) * | 2019-01-07 | 2019-03-19 | 大连理工大学 | A kind of the Laser Photoacoustic Spectroscopy trace gas detection instrument and method of calibration-free |
| CN111007014A (en) * | 2019-11-20 | 2020-04-14 | 东北大学 | First-order longitudinal full-resonance ellipsoidal cylindrical photoacoustic cell |
| CN111323376A (en) * | 2020-04-16 | 2020-06-23 | 中国科学院电工研究所 | Parallel incidence infrared thermal radiation photoacoustic spectrum gas sensing device |
| CN111323376B (en) * | 2020-04-16 | 2023-03-28 | 中国科学院电工研究所 | Parallel incidence infrared thermal radiation photoacoustic spectrum gas sensing device |
| CN111504910A (en) * | 2020-04-23 | 2020-08-07 | 山东大学 | High signal-to-noise ratio photoacoustic cell based on photoacoustic effect and photoacoustic signal detection device |
| CN112274113A (en) * | 2020-11-25 | 2021-01-29 | 广东普洛宇飞生物科技有限公司 | Photoacoustic cell detection device and cell detection method |
| CN112315430A (en) * | 2020-11-25 | 2021-02-05 | 广东普洛宇飞生物科技有限公司 | Cell detection apparatus and cell detection method |
| CN112683835A (en) * | 2020-12-18 | 2021-04-20 | 上海集成电路研发中心有限公司 | Mixed gas detection device and system |
| CN113607650A (en) * | 2021-06-22 | 2021-11-05 | 南方电网科学研究院有限责任公司 | Gas detection device |
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Application publication date: 20141231 |