Chromatic dispersion shear image surface interference hyper spectrum imaging device and method

Abstract

The invention provides a chromatic dispersion shear image surface interference hyper spectrum imaging device and a method. The chromatic dispersion shear image surface interference hyper spectrum imaging device comprises a front-placed optical system, an Sagnac chromatic dispersion shear beam splitting system, an imaging system and a signal processing system, wherein the front-placed optical system, the Sagnac chromatic dispersion shear beam splitting system, the imaging system and the signal processing system are placed in sequence along a light path direction. Incident light from each target point enters the front-placed optical system, a target view field is confirmed, stray light is eliminated, and collimated light beams are formed. The collimated light beams enter the Sagnac chromatic dispersion shear beam splitting system, are sheared into two transversely and form two beams of light with the shearing distance changing with the wave number. The two beams of light enter the imaging system, and a target image carrying with interference information is obtained on a detector target surface at an imaging objective lens back focal plane position. A detection target is pushed and swept so as to obtain the interference information of each target point under different optical path differences. The signal processing system conducts fourier transformation to the interference information so as to obtain spectral information of each target point and two-dimensional image information of each spectrum segment. The chromatic dispersion shear image surface interference hyper spectrum imaging method has the advantages of a hyper-spectrum spectral resolution ratio, a high light quantity, a high target resolution ratio and the like.

Description

Technical field [0001] The invention relates to an optical target detection method, in particular to a dispersion shearing image plane interference hyperspectral imaging device and method. Background technique [0002] Imaging spectroscopy technology uses a combination of radiation imaging technology and spectral measurement technology to obtain the two-dimensional spatial radiation intensity information of the target and the spectral information of each point of the target. Among them, the interference imaging spectroscopy technology is a new detection technology developed in the 1980s. It uses the Fourier transform relationship between interference information and spectral information to calculate the spectral information of the target and obtain the two-dimensional spatial information of the target. [0003] Compared with the dispersive imaging spectroscopy technology, the interference imaging spectroscopy technology has the advantages of high luminous flux and high target resol...

AI Technical Summary

Problems solved by technology

However, there are several problems in this method for imaging detection: (1) Limited by the dispersion characteristics of the prism, in the obtained spectral information, the spectral resolution at the long-wavelength band is much smaller than that at the short-wavelength band, so It is selective to the detection band; (2) This method can only improve the spectral resolution by changing the material and thickness of the dispersion prism, so in practical applications it may not be possible to select a suitable material, or it may require a large Only the volume dispersion prism can achieve the expected spectral resolution; (3) Since the introduction of the dispersion prism will affect the imaging quality of the instrument, it is necessary to design a complex imaging objective optical structure to correct the lack of imaging quality

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