Laser radar for determining atmosphere NO2 concentration based on raman light source differential absorption method

A differential absorption and laser radar technology, applied in the field of laser detection, can solve the problems of affecting the diffraction efficiency and light splitting effect, it is difficult to guarantee the spectrum of the light splitting system, and increase the cost of the system, so as to reduce the stability of the space position and improve the diffraction efficiency. Effect of system cost reduction

Inactive Publication Date: 2008-01-09
CHINA JILIANG UNIV
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Problems solved by technology

Among them, the double-grating monochromator is widely used because it can well suppress Rayleigh scattering and improve the signal-to-noise ratio. come error
At the same time, the double grating monochromator uses two gratings to split the light, which increases the system cost
The input and output light of the re-split system are usually coupled by optical fibers, and the relative position of the end face of the optical fiber at the focal plane of the lens will also affect the diffraction efficiency and splitting effect

Method used

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  • Laser radar for determining atmosphere NO2 concentration based on raman light source differential absorption method
  • Laser radar for determining atmosphere NO2 concentration based on raman light source differential absorption method

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Embodiment Construction

[0021] Referring to Figures 1 and 2, the differential absorption method based on Raman light source is used to measure atmospheric NO 2 Concentration lidar, including rotating Raman laser source, light receiving and splitting components, and photoelectric detection and control processing parts.

[0022] The Raman laser source is generated according to the following method: the fundamental frequency light generated by the Nd:YAG laser is subjected to frequency doubling, frequency doubling and primary filters to filter out the remaining fundamental frequency laser and frequency doubling laser, A pure linearly polarized 354.71 nm frequency tripled laser is obtained; the linearly polarized 354.71 nm frequency tripled laser is converted into a circularly polarized 354.71 nm frequency tripled laser through a 1 / 4 wave plate; then, the circularly polarized 354.71 nm frequency tripled laser is obtained nm triple frequency laser is pumped by lens focusing and charged with high voltage D...

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Abstract

The invention discloses a laser radar is based upon lame light source difference absorption process to test thickness of NO2 in the atmosphere, it includes lame light source, light incept and spectrum components, photo-detection and control transaction components, the characteristic is that the light incept and spectrum components accepts the scattered light from atmosphere backward by telescope tube of incept light, after coupling of light fiber, making the light to lay in the focal plane of lens, ripping into the raster by collimation lens, after section out the wave length of light 354.71nm and 360.00nm,recepted by the two emergent light fiber on the focal plane of lens. The raster is blazed grating, it has definite included angle with lens; the photo-detection and control transaction part includes microcomputer, data acquisition card, chronotron, enlarge shaping circuit, photomultiplier and photo-electricity probe. The invention has the beneficial purpose of easy structure, low cost, high diffraction efficiency, good flexibility, convenient using and vindicate etc.

Description

technical field [0001] The invention relates to the field of laser detection, in particular to the detection of atmospheric NO 2 Concentration lidar, specifically a Raman light source-based differential absorption method to measure atmospheric NO 2 Concentration lidar. Background technique [0002] NO 2 Gas is one of the main polluting gases in the atmosphere, but its instability due to easy oxidation and decomposition brings certain difficulties to real-time monitoring. Therefore, the current domestic detection methods for nitrogen oxides are mostly chemical methods, such as naphthalene ethylenediamine hydrochloride spectrophotometry, chemiluminescence method and primary cell coulometric titration method, etc., but these methods all need to be measured in the laboratory, and the real-time performance is poor and cannot be Meet the requirements of online measurement. The measurement of the concentration of air pollutants by lidar technology has been a hotspot in the past...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/39G01N21/65
Inventor 方达伟徐贲杨凯李波梁永峰
Owner CHINA JILIANG UNIV
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