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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.

Inactive Publication Date: 2012-12-05
昆山昱翌辉华电子科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention aims to solve the problem that the existing device for trace gas detection using tunable diode laser absorption spectroscopy technology is relatively large in size and not easy to carry, and provides a scattering-enhanced tunable diode laser trace gas detection device and detection method

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

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specific Embodiment approach 1

[0020] Specific embodiment one: the following combination figure 1 This embodiment will be described. The scattering-enhanced tunable diode laser trace gas detection device described in this embodiment includes a diode laser 1, a scattering medium 2, a photodetector 3, a sawtooth wave signal generator 4, and a sine wave signal. Generator 5, mixer 6, current controller 7, temperature controller 8, data acquisition card 9 and computer 10,

[0021] The sawtooth wave signal output end of the sawtooth wave signal generator 4 is connected to the sawtooth wave signal input end of the mixer 6, the sine wave signal output end of the sine wave signal generator 5 is connected to the sine wave signal input end of the mixer 6, the sawtooth wave The sawtooth wave signal output end of the signal generator 4 is also connected to the sawtooth wave signal input end of the data acquisition card 9, and the sine wave signal output end of the sine wave signal generator 5 is also connected to the si...

specific Embodiment approach 2

[0027] Embodiment 2: This embodiment is a further description of Embodiment 1, and the scattering medium 2 is an open-cell polyvinyl chloride foam.

specific Embodiment approach 3

[0028] Embodiment 3: This embodiment is a further description of Embodiment 1 or 2, and the temperature control range of the temperature controller 8 is 8°C-60°C.

[0029] The temperature control accuracy of the temperature controller 8 is 0.1°C.

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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.

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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Application Information

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IPC IPC(8): G01N21/39
Inventor 俞佳张治国曹文武
Owner 昆山昱翌辉华电子科技有限公司
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