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Gas component detection laser radar based on laser source with tunable wavelength

A technology for gas composition and laser detection, which is applied in the field of laser remote sensing, can solve the problems of large influence of laser frequency drift in measurement results, and achieve the effect of avoiding systematic errors and improving detection accuracy.

Active Publication Date: 2017-12-12
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it also has the following disadvantages: (1) A single set of differential absorption lidar can only detect a single type of gas composition; (2) Measurement requires precise frequency locking, and the measurement results are greatly affected by laser frequency drift

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  • Gas component detection laser radar based on laser source with tunable wavelength
  • Gas component detection laser radar based on laser source with tunable wavelength
  • Gas component detection laser radar based on laser source with tunable wavelength

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Embodiment 1

[0033] Embodiments of the present invention provide a gas composition detection lidar based on a wavelength-tunable laser source, which is suitable for direct detection schemes, such as figure 1 As shown, it mainly includes: wavelength tunable continuous laser 1, beam splitter 2, pulse generator 3, laser amplifier 4, laser emission system 5, telescope 6, filter 7, detector 8, first acquisition card 9, computer 10. Femtosecond laser 11, 3dB fiber beam splitter 12, balance detector 13 and second acquisition card 14; the above-mentioned devices form a detection part and a laser frequency calibration part; wherein:

[0034]The structure of the detection part is as follows: the output end of the wavelength tunable continuous laser 1 is connected to the input end of the beam splitter 2, the a end of the beam splitter 2 is connected to the input end of the pulse generator 3, and the output end of the pulse generator 3 is connected to the input end of the pulse generator 3. The input ...

Embodiment 2

[0043] Embodiments of the present invention provide a gas composition detection lidar based on a wavelength-tunable laser source, which is suitable for coherent detection schemes, such as figure 2 As shown, it mainly includes: wavelength tunable continuous laser 1, first beam splitter 2, second beam splitter 3, pulse generator 4, laser amplifier 5, laser emission system 6, telescope 7, adjustable attenuator 8 , the first 3dB beam splitter 9, the first balance detector 10, the first acquisition card 11, the computer 12, the femtosecond laser 13, the 3dB fiber optic beam splitter 14, the balance detector 15 and the second acquisition card 16; the above-mentioned devices Consists of a detection part and a laser frequency calibration part; where:

[0044] The structure of the detection part is as follows: the output end of the wavelength tunable continuous laser 1 is connected to the input end of the first beam splitter 2, the a end of the first beam splitter 2 is connected to th...

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Abstract

The invention discloses a gas component detection laser radar based on a laser source with the tunable wavelength. A laser source with the tunable wavelength is used for carrying out scanning to obtain absorbing lines of to-be-detected gas at different distances; a femtosecond optical comb is used for calibrating the frequency of emergent laser precisely; and non-linear fitting is carried out on the absorbing lines of the to-be-detected gas after frequency calibration and database comparison is carried out, so that concentration information of the to-be-detected gas is obtained. In order to measure the absorbing lines of the to-be-detected gas, the invention provides two kinds of solutions: one solution based on a direct detection mode and the other solution based on a coherent detection mode. According to an optimized wavelength scanning range, the gas component detection laser radar based on a laser source with the tunable wavelength is capable of realizing detection of various gas components and has characteristics of high detection precision, high distance resolution and high time resolution.

Description

technical field [0001] The invention relates to the field of laser remote sensing, in particular to a laser radar for detecting gas components based on a wavelength-tunable laser source. Background technique [0002] The detection of atmospheric gas composition is of great significance for the study of climate change and environmental protection. Especially with the rapid development of social economy, the emission of air pollutants has exceeded the carrying capacity of the environment. Due to its non-contact detection, high temporal and spatial resolution, and long detection distance, laser remote sensing detection is an effective means for detecting atmospheric gas components. Among them, differential absorption lidar has achieved atmospheric H 2 O, CO 2 , CO, HCI, NH 3 , NO 2 , SO 2 , O 3 For the detection of gas components, differential absorption lidar usually uses two wavelengths of lasers, one of which has a strong absorption cross-section on the gas to be meas...

Claims

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Application Information

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IPC IPC(8): G01S17/95G01N21/17
CPCG01N21/17G01N2021/1795G01S17/95Y02A90/10
Inventor 夏海云上官明佳唐大为窦贤康
Owner UNIV OF SCI & TECH OF CHINA
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