Method for improving spectrum reconstruction precision and resolution of liquid crystal tunable filter

Abstract

The invention discloses a method for improving spectrum reconstruction precision and resolution of a liquid crystal tunable filter. The method utilizes devices comprising an imaging target (1), a collimation system (2), the liquid crystal tunable filter (LCTF) (3), an imaging lens (4) and a detector array (5). The method comprises the steps of: 1) setting a wavelength of non-uniform sampling points of the liquid crystal tunable filter; 2) acquiring imaging spectrum data of the liquid crystal tunable filter, and preprocessing the imaging spectrum data; 3) establishing a spectra aliasing function model for of the non-uniform sampling points of the liquid crystal tunable filter; 4) and conducting spectrum reconstruction by combining with a Richardson-Lucy algorithm. The method discloses by the invention effectively improves the resolution of spectra, and the position precision and the amplitude precision of the spectral characteristic peaks.

Description

technical field [0001] The invention relates to the field of spectral measurement and spectral imaging, in particular to a method for improving the spectral reconstruction accuracy and resolution of a liquid crystal tunable filter. Background technique [0002] Liquid crystal tunable filter (LCTF for short) is composed of linear polarizer, fixed retarder and liquid crystal molecules. The arrangement direction of liquid crystal molecules is changed through the change of external voltage, so that the output spectrum interferes with each other, the target wavelength spectral signal is enhanced, and other wavelengths The spectral signal is attenuated, thereby outputting a spectrum of different wavelengths. LCTF has the advantages of wide spectral coverage, continuous tuning, simple and compact structure, fast response speed, and large light aperture. It has important applications in fields involving spectral measurement or spectral imaging such as biomedicine, semiconductors, ag...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is: aiming at the shortcomings of LCTF imaging spectrum accuracy, low spectral resolution and poor spectral reconstruction effect caused by undersampling and oversampling in LCTF uniform sampling mode, a method for improving LCTF spectral reconstruction is proposed. Accuracy and resolution method, which utilizes non-uniform sampling to effectively improve spectral reconstruction accuracy and resolution

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