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A method and device for receiving atmospheric Rayleigh echo optical signals with both high sensitivity and high linearity

A high-sensitivity, high-linearity technology, applied in the field of Rayleigh lidar, can solve the problems of inability to measure atmospheric Rayleigh echo signal detection, restricting the use of Rayleigh lidar, and difficult to take into account signal linearity and sensitivity. The effect of suppressing dynamic range, high sensitivity, and sensitivity guarantee

Active Publication Date: 2020-11-24
CAS HEFEI INST OF TECH INNOVATION
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Problems solved by technology

The disadvantage and deficiency of this method is that the effective detection range of the Rayleigh lidar is sacrificed, and it is usually impossible to measure the atmospheric Rayleigh echo signal detection within the height range of 30km to 45km
[0006] To sum up, the existing dynamic range suppression method of atmospheric Rayleigh echo signal is difficult to take into account the linearity and sensitivity of the signal, which restricts the use of Rayleigh lidar

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  • A method and device for receiving atmospheric Rayleigh echo optical signals with both high sensitivity and high linearity
  • A method and device for receiving atmospheric Rayleigh echo optical signals with both high sensitivity and high linearity
  • A method and device for receiving atmospheric Rayleigh echo optical signals with both high sensitivity and high linearity

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Embodiment Construction

[0025] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0026] First, the basic structural block diagram of the method and device, as well as the position and connection relationship of the method and device of the present invention in the Rayleigh lidar are described. Such asfigure 1 As shown, the atmospheric echo signal (comprising the atmospheric molecule Rayleigh echo signal and the atmospheric aerosol echo signal) is first received by the lidar receiving telescope 101; after the diaphragm 102 and the collimating lens 103 become parallel light; then Through the spectroscopic sheet 104, it is divided into an aerosol detection channel 105 and a Rayleigh detection channel 107, wherein the aerosol detection channel is used to obtain atmospheric aerosol echo signals within the range from near the surface to a height of 10 km, and the Rayleigh channel is used to detect Atmospheric molecular Rayleigh echo sig...

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Abstract

The invention relates to a method and a device for receiving atmospheric Rayleigh echo light signals with high sensitivity and high linearity considered, so as to solve the problem that high sensitivity and high linearity receiving for Rayleigh lidar echo signals are hard to consider at the same time. Firstly, in order to improve the signal-to-noise ratio of atmospheric Rayleigh echo signals, a photomultiplier detector with extremely high sensitivity is adopted; then, in order to ensure linear receiving of the atmospheric Rayleigh echo signals, a method of combining atmospheric aerosol opticalthickness historical observation data statistical characteristics and actually-measured values is invented to suppress the dynamic range of the atmospheric Rayleigh echo signals; and finally, a set of Rayleigh echo light intensity adaptive adjustment device is used to adjust changes of the atmospheric Rayleigh echo signal dynamic range caused by actual changes of atmospheric aerosol optical thickness. High sensitivity and high linearity receiving for Rayleigh lidar echo signals are both considered, and the conventional observation capability of the Rayleigh lidar can be effectively improved.

Description

technical field [0001] The invention relates to a method and device for receiving atmospheric Rayleigh echo optical signals with both high sensitivity and high linearity, and is used in the technical field of laser radar for atmospheric environment detection, especially for the Rayleigh laser radar for middle and upper atmosphere detection. Background technique [0002] The sensitivity of Rayleigh lidar signal detection refers to the response efficiency of Rayleigh lidar to the received atmospheric Rayleigh echo signal, which directly affects the signal-to-noise ratio of Rayleigh lidar to the detection of atmospheric Rayleigh echo signals; The linearity of the Rayleigh lidar signal detection refers to the linear response range of the Rayleigh lidar to the received atmospheric Rayleigh echo signal, which directly affects the fidelity of the Rayleigh lidar to detect the atmospheric Rayleigh echo signal. [0003] Rayleigh lidar is mainly used for the measurement of atmospheric ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S17/95G01S7/48
CPCG01S7/4802G01S17/95Y02A90/10
Inventor 伯广宇
Owner CAS HEFEI INST OF TECH INNOVATION
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