Polarizing optical splitter-based snapshot-type imaging spectrograph and imaging method

Abstract

The invention relates to a polarizing optical splitter-based high-spatial resolution snapshot-type imaging spectrograph and an imaging method, and belongs to the snapshot imaging spectral technical field. According to the spectrograph of the invention, based on a traditional imaging spectrograph, a polarizing optical splitter I is arranged between a collimating lens and a micro lens array, and an imaging arm optical path is increased; and a polarizing optical splitter II is arranged in an spectral arm optical path, such that a traditional single-optical path structure can be converted into a double-optical path structure of a balance spectral arm and an non-balance spectra arm. The imaging method includes the following steps that: interference signals which are obtained through a non-balance spectral arm photoelectric detector and signal processing component are subtracted from interference signals which are obtained through a balance spectral arm photoelectric detector and signal processing component; and obtained interference signals are subjected to DC removal, apodization, phase correction and Fourier transform processing, such that the image and spectral information of a target can be obtained. With the polarizing optical splitter-based high-spatial resolution snapshot-type imaging spectrograph and the imaging method of the invention adopted, the image and spectral information of a moving target can be captured quickly, and the spatial resolution and signal-to-noise ratio of a system can be greatly improved, and the application of the imaging spectrograph and imaging method to precision measurement can be benefitted.

Description

technical field [0001] A snapshot imaging spectrometer based on a polarization beam splitter and an imaging method belong to the technical field of snapshot imaging spectroscopy. Background technique [0002] The spectrometer is an instrument that can obtain the input spectral density function, and has a wide range of applications in agriculture, astronomy, biology, chemistry, colorimetry and other fields. The spectrometer principle is mainly divided into two types: one is a dispersive spectrometer with a prism and a grating as a dispersive element, which can directly obtain the spectrum of the target; the other is an interference based on a Michelson interferometer or other optical path difference generating elements. The spectrometer can directly obtain the interference intensity distribution of the target, and it needs to undergo Fourier transform to obtain the target spectrum. [0003] Dispersive spectrometers use prisms or gratings as dispersive elements to obtain the ...

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Problems solved by technology

[0007] However, in this system, since the system divides the original image into M×N sub-images, the spatial resolution of the final target image is very low, which cannot be applied to occasions requiring high spatial resolution; in addition, the target light source passes through Polarizer and analyzer, so its ideal optical efficiency is only 25%, resulting in a very low signal-to-noise ratio of the system, which cannot meet the requirements of fine measurement

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