Device and method of multispectral imaging by diffraction based on Nipkow disk

Abstract

The invention provides a device and a method of multispectral imaging by diffraction based on a Nipkow disk, belonging to the technical field of imaging spectroscopy. The device comprises a diffraction lens, a chromatography and imaging system consisting of a light shield, the Nipkow disk and a micro-lens array disk, a detector, a relative position fixing mechanism, a first and a second rotation driving mechanisms and a linear actuator, wherein, when the relative position fixing mechanism is unlocked, the first and the second rotation driving mechanisms can drive the light shield, the micro-lens array disk and the Nipkow disk to rotate respectively; when the relative position fixing mechanism is locked up, a first driving mechanism can drive the chromatography and imaging system to scan the focal plane in the direction of an incident image so as to directly acquire the two-dimensional image and the spectral information of the incident ray at a single wavelength; and the linear actuatorcan drive the chromatography and imaging system to scan along the optical axis of the diffraction lens so as to acquire the image and the spectral information of incident rays at all wavelengths within the detected spectral range. The invention has the characteristics of low stray light, high spectral resolution and high spatial resolution.

Description

technical field [0001] The present invention relates to a device and method in the technical field of imaging spectroscopy, in particular to a diffractive multispectral imaging device and method based on a Nipkow disk. Background technique [0002] Imaging spectroscopy technology combines imaging technology and spectroscopy technology. Using this technology to observe the measured target once, the two-dimensional image information and spectral information of the target can be obtained at the same time. This technology has been widely used in remote sensing, target recognition and other fields. . At present, people have adopted a variety of technical means to realize this technology, and spectral imaging technology based on diffractive lens belongs to one of them. [0003] In 1995, SPIE Vol. 2480, pages 123-131 "Image Spectrometry with a DiffractiveOptic" first disclosed an imaging spectrometer device composed of diffractive optical elements and detectors. US Patent Publica...

AI Technical Summary

Problems solved by technology

The disadvantage of the above scheme or device is that if you want to obtain the image and spectral information of a single wavelength of incident light, the detector of the above device must scan and record the focal plane of all wavelengths of incident light, and then use computer tomography for image processing. The image and spectral data of the single-wavelength incident light can only be obtained by removing the defocused spot of other wavelength incident light on the quasi-focal plane of each wavelength, so that the image and spectral information of the single-wavelength incident light cannot be extracted in real time

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