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Device for detecting methane and carbon dioxide in atmospheric greenhouse gas based on photoacoustic spectrum technology

A technology of greenhouse gas and photoacoustic spectroscopy, applied in the direction of measuring devices, material analysis through optical means, instruments, etc., can solve the problems of signal-to-noise ratio, poor stability, poor ability to resist environmental interference, etc., to improve signal-to-noise ratio, Reduce system noise and improve system stability

Inactive Publication Date: 2014-12-24
ZHEJIANG MEASUREMENT SCI RES INST
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Problems solved by technology

[0003] In order to solve the technical problems of poor signal-to-noise ratio, poor stability, and poor ability to resist environmental interference in the prior art, the present invention provides a photoacoustic spectroscopy technology that can simultaneously monitor the two most important greenhouse gases, methane and carbon dioxide, with high-resolution Noise ratio, high stability detection results are closer to the actual detection device
The optical microphone overcomes the weakness that traditional microphones are easily affected by electromagnetic noise and the humidity of the use environment, and need to be compensated in practical applications

Method used

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  • Device for detecting methane and carbon dioxide in atmospheric greenhouse gas based on photoacoustic spectrum technology
  • Device for detecting methane and carbon dioxide in atmospheric greenhouse gas based on photoacoustic spectrum technology
  • Device for detecting methane and carbon dioxide in atmospheric greenhouse gas based on photoacoustic spectrum technology

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Embodiment 1

[0020] Such as figure 1 and 2 as shown, figure 1The dotted line with an arrow indicates the path of the light; the solid line with an arrow indicates the circuit; the hollow arrow indicates the gas path. A device for detecting methane and carbon dioxide in atmospheric greenhouse gases based on photoacoustic spectroscopy, which includes a laser I1, a laser II2, a reflector 3, a high-transmission high-reflector 4, an air pump 5, a flow meter 6, a silencer 7, Photoacoustic cell 8, photodetector 9, 10-optical microphone, 11-isolation box, chopper 12, lock-in amplifier 13 and computer 14. Computer 14 is equipped with data acquisition card and upper computer software. The laser I1 includes a laser controller I and a laser emitter I electrically connected to its output end. The laser emitter I is a DFB laser that outputs a light beam I with a wavelength of 1573nm. The input end of the laser controller I is electrically connected to a computer 14. The laser II2 includes a laser co...

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Abstract

The invention provides a device for detecting methane and carbon dioxide in atmospheric greenhouse gas based on a photoacoustic spectrum technology and relates to the technical field of gas detection by utilizing optical detection. A laser I emits light beams I which are reflected by a reflector and reflected by a high-transmission high reflector; a laser II emits light beams II which are transmitted by the high-transmission high reflector; and the light beams I and the light beams II penetrate through a photoacoustic cell via a chopper to enter a photoelectric detector. A resonant cavity of the photoacoustic cell is connected with an optical microphone, the optical microphone is connected with a lock-in amplifier, the chopper is connected with the lock-in amplifier, and the lock-in amplifier and the photoelectric detector are respectively and electrically connected with a computer. According to the device disclosed by the invention, the technical problems of poor signal-to-noise-ratio stability and poor ambient interference resistance existing in the prior art are solved. The device disclosed by the invention has the beneficial effects that the noise of the system is effectively lowered, the stability of the system is improved, and the device is suitable for long-term monitoring. Meanwhile, two gases, namely methane and carbon dioxide, are monitored, and a technical basis is provided for researching the influence of greenhouse gases on weather.

Description

technical field [0001] The invention relates to the technical field of detecting gases by optical means, in particular to a device for detecting methane and carbon dioxide in atmospheric greenhouse gases based on photoacoustic spectroscopy. Background technique [0002] Atmospheric greenhouse gases lead to global warming and extreme climates. Greenhouse gases can effectively absorb infrared radiation and produce the greenhouse effect. The most important and most emitted greenhouse gas is carbon dioxide. Although methane is relatively small, its greenhouse effect is 26 times that of carbon dioxide. According to a report released by the United Nations World Meteorological Organization, in 2011, the carbon dioxide content of the earth's atmosphere hit a new high, reaching 390.9ppm. Methane levels also hit a record high at 1,813 ppb. Greenhouse gases have caused global warming, which has had a serious impact on natural ecosystems and the human living environment, and has bec...

Claims

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Application Information

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IPC IPC(8): G01N21/3504
Inventor 张建锋潘孙强陈哲敏林晓露
Owner ZHEJIANG MEASUREMENT SCI RES INST
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