Parameter calibration system and method of liquid crystal phase variable retarder

Abstract

The invention relates to a parameter calibration system and method of a liquid crystal phase variable retarder, belonging to the technical field of optical wavelength polarization control. The purposeof the invention is to solve a parameter calibration problem of a liquid crystal phase variable retarder under an arbitrary phase delay and an arbitrary wavelength. The calibration system of the liquid crystal phase variable retarder reads a desired diffracted light wavelength output value on a control computer connected to a spectrometer through tuning a radio frequency driver attached to an acousto-optic tunable filter; a voltage tuning driver of the liquid crystal phase variable retarder is tuned to read a corresponding system output light intensity value from the control computer, and thevalue of the phase delay [Delta] is calculated by means of a formula as shown in the specification; and a point where each set of parameter values is marked in a coordinate system through measuring the relationship among plurality sets of diffracted light wavelengths in the tuning range, the driving voltages, and the phase delays, and the parameter calibration of the liquid crystal phase variableretarder under the arbitrary wavelength and the arbitrary phase delay is realized by fitting a relationship curve of the wavelengths, the voltages and the phase delay.

Description

technical field [0001] The invention belongs to the technical field of optical wavelength polarization control, and in particular relates to a parameter calibration system and method of a liquid crystal phase variable retarder. Background technique [0002] Imaging polarization spectroscopy technology is a very important means of obtaining information. This technology can not only distinguish the low-reflection areas and contours on the target well, but also identify the three-dimensional information of the measured target in a complex background environment. This has very high application value in industry and agriculture. [0003] Polarization detection is further expanded on the basis of traditional detection of light intensity, spectrum and spatial three-dimensional data, adding four dimensions of polarization degree, polarization azimuth angle, polarization ellipticity and rotation direction. The polarization spectrum characteristics of objects are determined by their ...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the parameter calibration problem of liquid crystal phase variable retarder under any wavelength and any phase retardation, and propose a parameter calibration system and method of liquid crystal phase variable retarder

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