Calibration method of polarization laser radar based on Jones matrix and polarization laser radar

Abstract

The invention discloses a polarization laser radar calibration method based on a Jones matrix, and a polarization laser radar. The method is used for correcting a depolarization ratio of a polarization laser radar. According to the calibration method, the polarization direction of emission laser is changed by use of a half-wave plate, through angle change of the half-wave plate, a depolarization ratio of the angle change of the half-wave plate and a depolarization ratio change rate value are obtained, a Diff function comparing a depolarization ratio function with a depolarization ratio change rate function is established, the Diff function is fitted by use of a least square method, a Jones matrix constant of a system is obtained, and according to the Jones matrix constant, a corresponding half-wave plate optimization rotation angle is obtained; and when the polarization laser radar carries out long-distance detection, the half-wave plate optimization rotation angle is maintained unchanged, and by use of the Jones matrix constant, the depolarization ratio is corrected by use of the Jones matrix in a receiving optical path. According to the invention, bidirectional determination is realized through the Jones matrix constant and the half-wave plate angle, the scaling precision is high, and relative errors are small.

Description

technical field [0001] The invention relates to a calibration method of polarization laser radar and a polarization laser radar system adopting the method, in particular to a calibration method of polarization laser radar based on Jones matrix. Background technique [0002] The Jones matrix is ​​used to describe the transformation effect of the polarizing device on polarized light. It can be considered that any polarized light can be represented by a column matrix composed of two components of its light vector, and the superposition and synthesis of polarized light and the polarization state of the outgoing light can be known. . [0003] Polarization lidar is an effective tool for studying dust aerosols and cirrus clouds, which is crucial in atmospheric observations. In polarized lidar, the parallel echo signal reflects the detection information of meter scattering lidar. The ratio of vertical echo signal to parallel echo signal is the depolarization ratio, which is the dep...

AI Technical Summary

Problems solved by technology

This method eliminates the need for a reference depolarization ratio, but requires the exact angle of rotation of the half-wave plate

In addition, it is also a common method to use unpolarized light to generate the same signal in multiple channels to calibrate the parameters of polarized lidar systems, but this method is limited to ideal unpolarized light, which is not easy to obtain

Images