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Hadamard transform interferometric spectral imaging method and Hadamard transform interferometric spectral imaging equipment

A technology of interferometric spectral imaging and Hadamard transform, applied in interferometric spectroscopy, spectrometry/spectrophotometry/monochromator, spectral survey, etc. Complexity and other problems, to achieve the effect of reducing design difficulty, small size, and increasing luminous flux

Inactive Publication Date: 2009-09-09
XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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Problems solved by technology

[0006] The purpose of the present invention is to propose a Hadamard transform interference spectral imaging method and equipment, which solves the technical problems that the spatial resolution and spectral resolution are limited by the Hadamard template size and the system structure is complex in the background art

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  • Hadamard transform interferometric spectral imaging method and Hadamard transform interferometric spectral imaging equipment

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Embodiment Construction

[0033] see figure 1 , the technical method of the present invention is:

[0034] The front optical imaging system 1 images the target on the surface of the Hadamard template with n code elements;

[0035] The diaphragm 2 is placed close to the Hadamard template 3, and its function is to limit the field of view participating in the Hadamard transform coding and prevent stray light;

[0036] The Hadamard template 3 is located at the front focal plane of the Fourier lens 5, and the target image encoded by the Hadamard template 3 enters the transverse shearing interferometer 4, and the Hadamard template 3 is cut into two parts in the direction perpendicular to the optical axis. a virtual Hadamard template, which are parallel to the original Hadamard template 3 and have the same width direction;

[0037] The two virtual Hadamard templates pass through the Fourier mirror 5 and the cylindrical mirror 6, and produce interference on the detector 7 located at their back focal planes. ...

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Abstract

The invention relates to a Hadamard transform interferometric spectral imaging method comprising the following steps: (1) a target is imaged on the surface of a Hadamard template; (2) a field range taking part in the Hadamard transform coding is limited and vagabond ray is filtered; (3) the Hadamard template is cut into two void Hadamard templates in the direction vertical to the ray axis, and the two void Hadamard templates are parallel to and have the same width direction with the Hadamard template; (4) the two void Hadamard templates interfere with each other and the interferometric fringe direction is vertical to the cutting direction; (5) an interference pattern signal is sent in a computer processing system; (6) the coding is completed after the Hadamard template transforms coding for n times; (7) Fourier transform is performed for the interference pattern signal to obtain n target spectral images coded by the Hadamard template, the two-dimensional space information and the one-dimensional spectral information of the target are finally obtained after the images are decoded, and the imaging is completed. The invention is not limited by the size of the Hadamard templates and has simple formed system structure.

Description

technical field [0001] The invention relates to an interference spectrum imaging method and equipment, in particular to a Hadamard transform interference spectrum imaging method and a Hadamard transform interference spectrum imager designed according to the method. Background technique [0002] Hadamard Transform (Hadamard Transform) spectroscopy is a new spectral modulation technique similar to Fourier Transform (Fourier Transform) developed in the past forty years. Hadamard transform is a transformation based on plane wave function, which has the advantages of high energy input, multi-channel imaging and high signal-to-noise ratio [M.O.Harwit, N.J.A.Slone.Hadamard Transform Optics.Academic: New York, 1980], especially suitable for Weak spectral signal detection, Hadamard transform spectral imaging technology is one of the international frontier research topics. [0003] At present, all Hadamard transform spectral imaging techniques replace the incident slit or the exit sl...

Claims

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Application Information

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IPC IPC(8): G01J3/45
CPCG01J3/2823
Inventor 周锦松相里斌
Owner XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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