Solar radiation background noise suppression system based on fabry-perot etalon

Abstract

The invention discloses a solar radiation background noise suppression system based on a Fabry - Perot etalon. Daytime background noise is suppressed by using an ultra-narrowband tunable FP etalon as a filtering device, and technical support is provided for laser radar continuous full-time observation. A tunable FP etalon filter achieves closed-loop control by using the initial emission laser as the feedback signal of the system to ensure that the outgoing wavelength of the laser matches the center wavelength of the filter in real time. The system is applicable to laser radars of any working wavelengths. Since closed-loop control has less restricted requirements on a work environment, filter picometer-level bandwidth is strong in daytime background suppression of a laser radar.

Description

technical field [0001] The invention relates to the technical field of laser radar in atmospheric remote sensing, in particular to a solar radiation background noise suppression system based on a Fabry-Perot etalon. Background technique [0002] Since the invention of the laser in the 1960s, the research on various laser detection technologies around the laser has been increasing day by day. Atmospheric science is a subject that combines theoretical research with atmospheric parameter detection. Atmospheric detection technology is an important basis for the development of atmospheric science, especially atmospheric physics and atmospheric environmental science. At present, there are many means of detecting atmospheric parameters below the boundary layer, but relatively few means of measuring information on atmospheric parameters in the middle and upper layers, especially in the stratosphere and above. Lidar remote sensing technology is an active remote sensing technology th...

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Problems solved by technology

However, this method has the following disadvantages: first, the Fraunhofer dark line of the solar spectrum is a fixed wavelength, which is not suitable for other wavelength lidars; second, the detector has a wide-spectrum response, even if the working wavelength is the dark line wavelength of the solar spectrum , then the detector can still respond to other ranges of wavelengths, and can also accept the background noise of the sun during the day, and cannot really achieve the purpose of improving the signal-to-noise ratio during the day

[0005] In short, LiDAR is subject to strong solar radiation noise during the day. In order to realize LiDAR working all day, it is necessary to suppress the background noise of LiDAR and improve the signal-to-noise ratio. Currently, there are various ways to suppress the SNR Such defects

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