Mueller matrix measurement system and method

Abstract

The invention provides a new Mueller matrix measurement system and method, and can measure a Mueller matrix of a target efficiently and accurately. The measurement system comprises a light source system, a polarization system, a to-be-measured target, a polarization detection system and a computer processing system which are arranged successively along an optical path. The polarization system comprises a vertical linear polarizing film, a first liquid crystal phase retarder and a second liquid crystal phase retarder arranged successively along an incident optical path; included angles of fastaxes of two liquid crystal phase retarders with the horizontal direction are 45 DEG and 90 DEG respectively. The polarization detection system is a polarization camera for simultaneously detection ofdivided aperture full polarization states. The light source system meets the requirements: polarized light emitted by the to-be-measured target eventually covers all the optical channels of the polarization camera; the computer processing system is used for controlling the voltage loaded onto the two liquid crystal phase retarders to modulate the polarization state of the incident light on the to-be-measured target, and storing an intensity map collected by the camera, and calculating the Muller matrix according to the intensity value.

Description

technical field [0001] The invention belongs to the field of polarization detection, and relates to a system and a measurement method for measuring Mueller (Mueller) matrix. Background technique [0002] Stokes vector (S 0 , S 1 , S 2 , S 3 ) T As a one-dimensional vector used to describe the polarization state of light. When a beam of light described by a Stokes vector is irradiated on an object, the outgoing light (including reflected light and transmitted light) of the object is modulated, so that a new Stokes vector is used to describe the polarization characteristics of the outgoing light, and this incident and outgoing Stokes The transformation relationship between vectors is called the Mueller matrix. The Mueller matrix is ​​a 4×4 real number matrix. Each element or element group in the Mueller matrix has a different practical meaning, which completely characterizes the modulation characteristics of the object to the outgoing light, including dichroism, phase de...

AI Technical Summary

Problems solved by technology

This type of method requires more than a dozen or even dozens of tedious experimental operations, the experimental process is time-consuming, and the impact of each adjustment on the accuracy of the detection results and the asynchrony of the records reduce the measurement accuracy

In addition, this type of method requires many experimental operations. This time-sharing makes it suitable for measuring the Mueller matrix of stable medium targets, but it is difficult to accurately measure the Mueller matrix of unstable medium targets.

Changchun University of Science and Technology proposed a method for measuring the Mueller matrix of the smog medium by dividing the amplitude, which saves a lot of experimental procedures, but uses 4 detectors. The system is huge and the structure is complex. Different parameters will lead to errors in measurement results, which is expensive

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