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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[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
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[0019] Example 1:
[0020] Such as figure 1 with 2 As shown, figure 1 The dotted line with arrow indicates the path of light; the solid line with arrow indicates the circuit; the hollow arrow line indicates the gas path. A detection device for methane and carbon dioxide in atmospheric greenhouse gases based on photoacoustic spectroscopy technology. It includes a laser I1, a laser II2, a mirror 3, a high-transmittance mirror 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. The computer 14 is equipped with a data acquisition card and upper computer software. The laser I1 includes a laser controller I and a laser transmitter I electrically connected to its output terminal. The laser transmitter I is a DFB laser and outputs a beam I with a wavelength of 1573 nm. The input terminal of the laser controller I is electrically connected to the computer 14. Th...
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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...
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Inventor 张建锋潘孙强陈哲敏林晓露
Owner ZHEJIANG MEASUREMENT SCI RES INST
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