Transverse Shear Interferometric Scanning Fourier Transform Imaging Spectrometer

Abstract

The invention provides a Fourier transform imaging spectrometer adopting lateral shear interference scanning, which can better realize spectral imaging detection in a ground staring state or a stable tracking state. The Fourier transform imaging spectrometer mainly comprises a pyramidal Michelson lateral shear two-beam interferometer used for generating linear interference fringes on an imaging surface of a target scenery, a movable mirror scanning mechanism used for driving one movable mirror in the lateral shear two-beam interferometer to axially move for one-dimension scanning of an interference pattern on the imaging surface, a Fourier optical imaging objective lens used for focusing emergent light from the lateral shear two-beam interferometer to the imaging surface, a CCD (charge coupled device) area-array camera used for detecting a scenery target image interfering modulation, an image data processor used for recording and processing image data output by the CCD area-array camera, and a control system used for coordination control of operation of the movable mirror scanning mechanism, the CCD area-array camera and the image data processor. The invention further provides a method for spectral imaging by the spectrometer.

Description

technical field [0001] The invention relates to an optical interference imaging spectrometer, that is, a Fourier transform spectrometer. Background technique [0002] Imaging spectrometer is a new imaging technology developed in the 1980s. The image data obtained by it is a data cube containing two-dimensional spatial information and one-dimensional spectral information. [0003] Imaging spectrometers are especially suitable for observing ground objects from mobile satellite platforms, airborne platforms or ground-based platforms for geological and mineral research, environmental protection applications, long-distance target detection and military target detection. [0004] There are many kinds of imaging spectrometers in use. Their optical systems are very different. According to the method of obtaining the spectrum, imaging spectrometers can be divided into three categories: [0005] The first type of imaging spectrometer uses optical filter technology to obtain spectral ...

AI Technical Summary

Problems solved by technology

[0017] For large-aperture static interference spectroscopy, the complete data cube is completed by the movement (push-broom) of the carrying platform. Therefore, in ground applications, it is necessary to add a mirror at the front end of the system to scan or rotate the entire system. Push-broom is realized, and this kind of scanning and rotation is often of large size and large angle, which will bring about changes in the center of mass and moment of inertia, thus affecting the normal use of the instrument

[0018] When the above-mentioned technologies are applied to a large range of fixed scenes under the ground staring state, especially the spectral imaging detection based on the target tracking method in the shooting range, it is often limited or even difficult to achieve. Therefore, it is hoped that there will be better technical means. Realize spectral imaging detection under ground staring state or stable tracking state

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