Rotating-mirror Fourier interference imaging spectrometer

Abstract

The invention relates to a rotating-mirror Fourier interference imaging spectrometer, which is characterized in that the rotating-mirror Fourier interference imaging spectrometer sequentially consists of a front telescope imaging system, an entrance slit, a collimator, a Sagnac spectrometer, a re-imaging Fourier lens and a flat-panel detector along a laser incident light path, wherein the Sagnac spectrometer consists of a first total-reflection mirror, a second total-reflection mirror and a semitransparent half-reflection mirror, the semitransparent half-reflection mirror and an incident light beam form a 45-degree included angle, the semitransparent half-reflection mirror is provided with a rotating mechanism for changing the incident angle of the incident light beam, the positions of the first total-reflection mirror and the second total-reflection mirror are fixed, the entrance slit is arranged on the focus of the front telescope imaging system, the re-imaging Fourier lens is arranged in the direction of the output light of the Sagnac spectrometer, and the flat-panel detector is arranged in the image plane of the re-imaging Fourier lens. By using the rotating-mirror Fourier interference imaging spectrometer, the spatial information and the spectral information of a detected object can be obtained. The rotating-mirror Fourier interference imaging spectrometer has the characteristics of compact structure and miniaturization. Moreover, the application scope of the Fourier interference imaging spectrometer is expanded.

Description

technical field [0001] The invention relates to a spectrometer, in particular to a rotating mirror Fourier interference imaging spectrometer. Background technique [0002] The spectrometer is an ancient instrument. The spectrum is usually spread out in space by means of dispersion for detection. However, the dispersive spectrometer is bulky and expensive, and the resolution is not high, which has gradually failed to meet the application requirements. Another method for obtaining spectra is an interferometer, such as a Fabry-Pelot interferometer (hereinafter referred to as an F-P interferometer). The F-P interferometer is actually a tunable filter that passes the desired wavelengths and filters out the unwanted ones. In this way, the higher the resolution, the smaller the ability to pass wavelengths, thereby reducing the signal-to-noise ratio. Another method is to use acousto-optic modulation of spectral filters, but there are also shortcomings of F-P interferometers. In...

AI Technical Summary

Problems solved by technology

Such a system is very complex and highly influenced by the environment

In addition, this type of interferometer can only use two methods to scan the zero point of optical path difference, the target moves or the entire interferometer moves, which also limits the application occasions of the interferometer

Images