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Gas differential absorption laser radar based on non-coherent light source

An incoherent light source and differential absorption technology, which is applied in color/spectral characteristic measurement, radio wave measurement systems, instruments, etc., can solve the problems of high cost and complex structure, and achieve high precision and easy human eye safety.

Active Publication Date: 2017-05-31
南京泰爱信科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The inventors of the present invention have found through research that most existing differential absorption lidars use coherent laser light sources with narrow linewidths, which are expensive and relatively complex in structure

Method used

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  • Gas differential absorption laser radar based on non-coherent light source
  • Gas differential absorption laser radar based on non-coherent light source
  • Gas differential absorption laser radar based on non-coherent light source

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Embodiment

[0041] figure 1 is a structural block diagram of a gas differential absorption lidar based on an incoherent light source provided by an embodiment of the present invention, as shown in figure 1 As shown, it includes: a light source module, a first filter module, a second filter module, a first optical switch 3, a first beam splitter 6, an optical amplifier 7, an outgoing telescope 8, a receiving telescope 9, and a first optical delay element 10 , a second filtering module, an attenuator 13, a second beam splitter 14, a gas absorption cell 15, a second optical delay element 16, a coupler 17, a detector 18, a data acquisition module 19 and a digital signal processing module 20;

[0042] The light source module is used to output pulsed light.

[0043] In an alternative embodiment, such as figure 1 As shown, the light source module includes an incoherent light source 1 for outputting continuous light and a pulse modulator 4 for modulating the input continuous light into pulsed l...

Embodiment 2

[0071] figure 2 It is a structural block diagram of another gas differential absorption lidar based on an incoherent light source provided by the embodiment of the present invention. The difference between embodiment 2 and embodiment 1 lies in the specific form of the light source module, such as figure 2 As shown, the light source module includes an incoherent light source 1 for outputting pulsed light. In Embodiment 2, since the incoherent light source 1 outputs pulsed light, a pulse modulator is not required in this embodiment. The rest of this embodiment is the same as Embodiment 1, and will not be repeated here.

Embodiment 3

[0073] image 3 It is a structural block diagram of another gas differential absorption lidar based on an incoherent light source provided by the embodiment of the present invention. The difference between embodiment 3 and embodiment 1 lies in the specific form of the first filtering module.

[0074] Such as image 3 As shown, the first filter module includes a second optical switch 2-1, a second Bragg grating 2-2 and a third Bragg grating 2-3;

[0075] The laser light emitted from the incoherent light source 1 is gated by the second optical switch 2-1, and the central wavelength of the laser light output from the second optical switch 2-1 is filtered by the second Bragg grating 2-2 is located at the At the peak of the gas absorption line, the center wavelength of the laser light filtered out by the third Bragg grating 2-3 from another laser output from the second optical switch 2-1 deviates from the gas absorption line to be measured.

[0076] In an optional embodiment, bot...

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Abstract

The invention discloses a gas differential absorption laser radar based on a non-coherent light source. The laser radar uses a non-coherent light source, laser of two operating wavelengths is filtered by a filtering technology, one operating wavelength is positioned on the peak value of a gas absorption line, the other operating wavelength deviates from the gas adsorption line, and the differential adsorption detection of an atmosphere gas ingredient can be realized through the detection of the atmosphere echo signal of two beams of laser. A time division multiplexing technology is adopted, only one detector is used for finishing the measurement of reference laser and signal light, and a system integration level is improved. According to the gas differential absorption laser radar, the gas (such as water vapour, CO2, HCN, CO and the like), which is positioned in a non-coherent light source frequency spectrum range, of the gas adsorption line can be realized. A non-coherent detection technology, a wavelength division multiplexing technology and the time division multiplexing technology are adopted to realize the detection of gas ingredients, and the gas differential absorption laser radar has the advantages of high system integration degree, all fiber linking, compact structure, low construction cost, relatively safe human eyes and the like.

Description

technical field [0001] The invention relates to a laser radar, in particular to a gas differential absorption laser radar based on an incoherent light source. Background technique [0002] Due to its high time resolution, high spatial resolution, long detection distance, high measurement accuracy and all-weather operation, differential absorption lidar has become the main instrument for measuring atmospheric gas composition. The combination of differential absorption technology and three-dimensional scanning technology can realize three-dimensional imaging of atmospheric components with high temporal and spatial resolution, and its application has attracted more and more attention from countries and regions. [0003] Differential absorption lidar usually adopts two operating frequencies, one frequency laser is locked at the gas absorption line, and the other frequency laser deviates from the gas absorption line, by measuring the difference between the atmospheric callback si...

Claims

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Application Information

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IPC IPC(8): G01N21/31G01S7/481
CPCG01N21/31G01S7/481
Inventor 张仁俊赵自豪
Owner 南京泰爱信科技有限公司
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