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Laser radar system and method for detecting atmosphere carbon dioxide concentration

A technology of carbon dioxide and laser radar, which is applied in the field of laser detection systems, can solve problems such as low measurement accuracy and complex systems, and achieve the effect of reducing system errors

Inactive Publication Date: 2015-04-29
SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI
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Problems solved by technology

[0003] The present invention proposes a continuous wave differential absorption laser radar system and method for measuring atmospheric carbon dioxide concentration, which solves the problems of complex conventional differential absorption laser radar systems and low measurement accuracy

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  • Laser radar system and method for detecting atmosphere carbon dioxide concentration

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Embodiment Construction

[0019] According to the method described in the content of the invention, we have designed a set of laser radar system for detecting atmospheric carbon dioxide, wherein the ON wavelength laser 2 and the OFF wavelength laser 5 are DFB lasers produced by EM4 company, and its wavelength covers 1572nm, and the output power is greater than 60mW; Laser controller 1 and OFF wavelength laser controller 4 are developed by ourselves, the temperature stability is due to one thousandth of a degree, the constant current source stability is due to 100ppm / ℃, and current modulation can be performed, so as to realize the wavelength modulation of the laser; The first electro-optic modulator 3 and the second electro-optic modulator 6 are the 10GHz laser intensity modulator LN63S produced by Thorlabs; the first fiber coupler 7 and the second fiber coupler 9 are common single-mode polarization-maintaining fiber couplers; Amplifier 8 is a laser amplifier produced by IPG for amplifying the wavelength...

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Abstract

The invention discloses a laser radar system and a laser radar method for detecting concentrations of CO2 (Carbon Dioxide) in atmosphere. An ON wavelength laser device of the laser radar system does not adopt a conventional active frequency stabilization technology, but adopts a passive frequency stabilization and frequency modulation technology, the change of an echo signal of an ON laser reflects the intensity change of an echo caused by the frequency modulation during a shortest time, a minimal value of a period reflects an echo signal of the wavelength at a CO2 absorption peak at this moment, and the echo signal and a signal obtained by an emitted energy monitoring photoelectric detector are conducted for normalization processing, namely, the intensities of ON and OFF wavelength echo signals can be accurately obtained, and the concentrations of the CO2 in atmosphere can be inverted by a differential absorption laser radar equation. By using the method, the measuring precision of the system can be improved, and the complexity of the system can be simplified.

Description

technical field [0001] The invention relates to a laser radar system for detecting atmospheric carbon dioxide, in particular to a laser detection system for detecting the spatial concentration distribution of carbon dioxide based on a differential absorption principle. Background technique [0002] Since entering the industrialized society, the global warming caused by human activities has been widely concerned. As an important greenhouse gas, CO2, its source and sink changes are of great significance to the study of climate warming. As an effective means to monitor atmospheric CO2 changes, differential absorption lidar has received extensive attention. The current differential absorption lidar generally requires two laser beams with different frequencies, one of which is at the non-absorbing wavelength of carbon dioxide (OFF wavelength), and the other is at the absorption peak wavelength of carbon dioxide (ON wavelength). Usually, the wavelength of the laser within the abs...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S17/95G01N21/39
CPCG01N21/39G01S17/95Y02A90/10
Inventor 洪光烈刘豪郑龙葛烨舒嵘胡以华
Owner SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI
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