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Atmospheric visibility analysis method based on coherent laser radar spectral intensity data

A technology of atmospheric visibility and laser radar, which is applied in the direction of material analysis, material analysis, and color/spectral characteristic measurement through optical means, can solve problems such as coherent laser radar atmospheric visibility analysis that has not yet appeared, and achieve the effect of expanding the measurement function

Active Publication Date: 2020-07-28
青岛镭测创芯科技有限公司
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[0006]There is currently no application of coh

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  • Atmospheric visibility analysis method based on coherent laser radar spectral intensity data
  • Atmospheric visibility analysis method based on coherent laser radar spectral intensity data
  • Atmospheric visibility analysis method based on coherent laser radar spectral intensity data

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[0043] The detection process of the coherent laser radar is the frequency mixing detection of the laser local oscillator signal and the radar echo signal in space. Among them, the laser local oscillator signal is a narrow bandwidth signal with a certain intensity derived from the laser seed source. The echo of the laser emission pulse in the atmosphere is received by the same optical device, and then mixed with the local oscillator light in space, and then the optical signal is converted into an electrical signal by the detector.

[0044] Among them, the local oscillator signal of the coherent lidar system is:

[0045]

[0046] A od is the local oscillator amplitude, is the optical phase of the local oscillator, f od is the optical frequency of the local oscillator; x and y are the plane coordinate information of the optical distribution of the local oscillator, and t corresponds to the time information; the above form is a complex representation, where the real part re...

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Abstract

The present invention provides an atmospheric visibility analysis method based on coherent laser radar spectrum intensity data, according to signal detection process analysis of a coherent laser radar, the maximum intensity of gate spectrum data of different distances contains atmospheric echo information. Spectral intensity data of corresponding height is extracted and can correspondingly includean atmospheric extinction coefficient and a backscattering coefficient atmospheric laser radar equation. The atmospheric extinction coefficient is inverted by utilizing the calculation relationship between the atmospheric backscattering coefficient and the atmospheric extinction coefficient. Atmospheric visibility results are finally obtained at different heights by combining the relationship between the atmospheric visibility and the extinction coefficient. The coherent laser radar carries out visibility detection, the application function of the coherent radar is expanded, and the data utilization rate of a coherent system is improved. Compared with traditional aerosol laser radar detection, the spectral intensity data is large in signal-to-noise ratio, and the detection distance and precision have obvious advantages. Moreover, the coherent laser radar is compact in structure, optical components are stable and reliable, and the reliability of the used environment is superior to thatof a traditional aerosol radar.

Description

technical field [0001] The invention relates to a laser radar detection method, in particular to a method for measuring atmospheric visibility information based on coherent laser radar spectrum intensity data. Background technique [0002] Atmospheric information, such as wind speed, temperature, humidity, aerosol, cloud and other information, plays a very important role. Whether it is for weather forecasting, safe and efficient operation of airports, monitoring of air pollutants, or military applications, it plays a very important role. [0003] The measurement information of lidar has high temporal and spatial resolution and can be measured continuously, which has obvious advantages compared with traditional atmospheric detection methods. Coherent lidar systems have mature applications, but they are mainly used for atmospheric wind field measurement. In coherent lidar, the echo intensity is transformed into spectral data by Fourier transform. Spectral data information i...

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Application Information

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IPC IPC(8): G01S17/95G01S7/48G01N21/25
CPCG01S17/95G01S7/4802G01N21/25G01N2021/1744Y02A90/10
Inventor 秦胜光尹嘉萍王希涛李荣忠宋小全吴松华
Owner 青岛镭测创芯科技有限公司
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