Device and method for detecting NO2 concentration distribution

A technology of concentration distribution and signal intensity, applied in the application field of laser spectroscopy technology, can solve the problems of complex photoelectric detection structure, difficult practical application, poor stability, etc., and achieve the effect of simplifying system structure, reducing system cost and improving stability.

Pending Publication Date: 2016-11-16
DALIAN UNIV OF TECH
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Problems solved by technology

[0005] The present invention provides a NO 2 The device and method for concentration distribution detection effectively overcome the NO 2 Concentration distribution detection is faced with bottleneck problems such as light source and photoelectric detection structure, poor stability, high cost, and difficulty in practical application.

Method used

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  • Device and method for detecting NO2 concentration distribution
  • Device and method for detecting NO2 concentration distribution
  • Device and method for detecting NO2 concentration distribution

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Experimental program
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Embodiment

[0024] a kind of NO 2 The method for concentration distribution detection, the steps are as follows:

[0025] A. Control the temperature and driving current of the first laser and the second laser, and lock their output wavelengths at NO 2 The absorption intensity on the gas absorption line is relatively large (λ on ) and smaller (λ off ), the wavelength setting criteria of the first laser and the second laser are: NO 2 Gas at λ on and lambda off There are different absorption intensities at the two wavelengths.

[0026] B. The output beams of the first laser and the second laser are coupled into a beam by a polarizing beam splitter, and the beam is collimated by a laser emitting device and emitted into the atmosphere. Wherein the polarization state of the output beam of the second laser is rotated by 90 degrees by a half-wave plate.

[0027] C. After setting the driving current of the second laser to 0 or lower than the working threshold, turn off the second laser; con...

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Abstract

The invention belongs to the field of laser spectrum technology application and in particular relates to a device and a method for detecting NO2 concentration distribution. A first laser and a second laser which are vertical are placed, by virtue of a half-wave plate, polarization state of a laser beam emitted by the second laser is rotated for 90 degrees, and polarization states of the laser beams emitted by the first laser and the second laser are vertical; then the laser beams emitted by the first laser and the second laser are combined into one beam by virtue of a polarizing beam splitter placed and inclined for 45 degrees, and then the beam is collimated and transmitted into the air by a laser transmitting device; and a backward scattering signal of the laser beam transmitted into the air is collected by a laser receiving device and is imaged onto an image sensor which is arranged in an inclined manner after an atmosphere signal is filtered and removed by virtue of a bandpass filter. By adopting the device and the method which are provided by the invention, system structure is greatly simplified, system cost is reduced, and system stability is improved.

Description

technical field [0001] The invention belongs to the application field of laser spectrum technology, in particular to a NO 2 Apparatus and method for concentration profile detection. Background technique [0002] Lidar (Light Detection and Ranging, Lidar) technology is an active optical remote sensing detection technology, which has unique advantages in height / spatial resolution, detection sensitivity, anti-interference ability, and real-time monitoring. Since the advent of lasers, European and American countries have begun to apply lidar technology to atmospheric environment monitoring. Differential absorption lidar (DIAL) technology is a special form of lidar technology. According to the absorption lines of different gases in DIAL technology, a large pulsed laser emits laser pulses of different wavelengths into the atmosphere in sequence (a beam of wavelength is located at the position where the absorption intensity of the gas to be measured is high, such as the absorptio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/39
CPCG01N21/39
Inventor 梅亮
Owner DALIAN UNIV OF TECH
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