Single-pixel detection wind measuring lidar based on polarization double edges

Abstract

The invention discloses a single-pixel detection wind measuring lidar based on polarization double edges. The polarization state of a reflection signal of an F-P interferometer is regulated to be orthogonal with the polarization state of the reflection signal through the polarization multiplexing technology; when the reflection signal passes the F-P interferometer, due to the polarization characteristic of the F-P interferometer, the transmittance curve of the reflection signal and the transmittance curve of a transmittance signal have a frequency shift difference, and accordingly the double edges are formed. Laser frequency is locked at the intersection point of the two transmittance curves, when Doppler shift happens to an atmospheric echo signal, energy of one signal is increased, energy of the other signal is weakened, and atmosphere air speed information is extracted according to relative change of the two energies. According to the scheme, energy resources can be fully used, and the lidar has the advantages of inhibiting solar background noise and being compact in structure and low in manufacturing cost.

Description

technical field [0001] The invention relates to the field of lidar, in particular to a single-pixel detection and wind-measuring lidar based on polarization double edges. Background technique [0002] Atmospheric detection lidar has been applied in speed measurement, imaging, pollutant monitoring, wind measurement, temperature measurement, aerosol optical characteristic detection due to its advantages of good directionality, high temporal and spatial resolution, high precision, and non-contact detection. and other fields. Among them, Doppler wind lidar is of great significance to improve the accuracy of long-term weather forecast, improve climate research models and improve military environment forecast. Doppler wind lidar can be divided into coherent detection and direct detection according to different detection principles. Coherent detection detects wind speed by means of laser atmospheric echo signal and local oscillator laser beat frequency. Direct detection uses a f...

AI Technical Summary

Problems solved by technology

[0008] The disadvantage of the first scheme and the second scheme is that the reflected signal of the F-P interferometer is not used, resulting in a waste of energy; at the same time, multiple detectors are required, and it is difficult to avoid the system that is unstable between the detectors. error

The disadvantage of the third scheme is that, due to the use of the reflection spectrum of the F-P interferometer, the suppression of the solar background noise by the F-P interferometer is reduced, the signal-to-noise ratio is reduced, and the detection distance is reduced.

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