Method and device for detecting trace gas by scattering-enhanced tunable diode laser

A diode laser and diode laser technology, which is used in the measurement of color/spectral characteristics, etc., can solve the problems of large size and difficult portability of the device, and achieve the effects of high detection sensitivity, low cost, and reduced volume.
CN102809547AInactive Publication Date: 2012-12-05昆山昱翌辉华电子科技有限公司
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
昆山昱翌辉华电子科技有限公司
Publication Date
2012-12-05
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a method and a device for detecting trace gas by a scattering-enhanced tunable diode laser and belongs to the field of detection technique of trace gas content. The problem that the existing device for detecting the trace gas by adopting a tunable diode laser absorption spectrum technology is not easy to carry due to large size is solved. The device for detecting the trace gas by the scattering-enhanced tunable diode laser comprises the diode laser, a scattering medium, a photoelectric detector, a sawtooth wave signal generator, a sine wave signal generator, a frequency mixer, a current controller, a temperature controller, a data acquisition card and a computer. The method comprises the following steps: the diode laser modulated by sine wave and sawtooth wave is taken as a light source to irradiate the scattering medium; the photoelectric detector transforms a received optical signal passing through the scattering medium into an electrical signal which serves as a sampled signal to be input to the data acquisition card, and the data acquisition card inputs the received sawtooth wave signal, sine wave signal and sampled signal to the computer. The method and the device are applicable to the detection of the trace gas.
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Description

technical field

[0001] The invention relates to a scattering-enhanced tunable diode laser trace gas detection device and a detection method, which belong to the technical field of trace gas content detection. Background technique

[0002] The sensitive detection technology of trace gas has important application prospects in many fields such as industry, medical treatment and environmental monitoring. At present, absorption spectroscopy is commonly used to detect it. The more mature ones are differential absorption spectroscopy DOAS, Fourier transform spectroscopy FTIR and tunable diode laser absorption spectroscopy TDLAS.

[0003] Tunable diode laser absorption spectroscopy TDLAS technology has been widely used in many fields such as industrial pollutant detection and atmospheric detection due to its high sensitivity, low detection limit and fast response. TDLAS technology is to tune a diode laser with a very narrow emission spectrum, so that its scanning range passes throu...

Claims

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