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Coherent dispersion spectral imaging method and device for realizing large optical path difference and high stability

A high-stability, spectral imaging technology, applied in the field of spectral imaging, can solve the problems of large optical path difference, harsh environmental requirements, low transmittance and sensitivity, etc., to achieve improved stability, high energy utilization, and improved sensitivity Effect

Inactive Publication Date: 2021-05-25
XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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Problems solved by technology

[0004] The purpose of the present invention is to propose a large optical path difference, high stability coherent dispersion spectral imaging method and imaging device, to overcome the strict environmental requirements and transmittance and The problem of low sensitivity

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  • Coherent dispersion spectral imaging method and device for realizing large optical path difference and high stability

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Embodiment Construction

[0036] The invention combines the interference spectroscopic technology and the dispersion spectroscopic technology to realize the coherent dispersion imaging, improves the energy utilization rate and has higher transmittance, sensitivity and stability. Specifically, it can be achieved through the following steps: first, adjust the target light to enter the interference beam path with parallel or converging light, then divide the target light into two beams with an intensity of 50:50, and adjust the optical path difference between the transmitted beam and the reflected beam, Interference fringes are formed, and the interference fringes are converged and imaged on the slit, which becomes the incident image plane position of the dispersion device in the subsequent optical path; finally, the interference fringes are dispersed to the photodetector for reception according to the wavelength.

[0037] The present invention will be further described below in conjunction with the accomp...

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Abstract

The invention belongs to the technical field of spectral imaging, and relates to a coherent dispersion spectral imaging method and device for realizing large optical path difference and high stability. The problems that coherent dispersion spectral imaging based on a traditional Michelson interferometer is strict in environment requirement and low in transmittance and sensitivity are solved. The method comprises steps of dividing a target light beam into two light beams with the intensity ratio of 50:50 by using a beam splitter; using an optical path adjusting element for changing the optical path of the two light beams to form interference fringes; converging and imaging the interference light to the slit by using a converging lens; dispersing the interference fringes according to wavelengths by using a dispersion device; and receiving interference fringe information dispersed by the dispersion device by using a photoelectric detector. Compared with a traditional coherent dispersion spectral imager, the imaging device has the advantages of being high in energy utilization rate, high in sensitivity, compact in structure and high in stability.

Description

technical field [0001] The invention belongs to the technical field of spectral imaging, and relates to a coherent dispersion spectral imaging method and device for realizing large optical path difference and high stability. Background technique [0002] Accurate radial velocity measurements based on coherent dispersion techniques are a promising technique for detecting exoplanets. The traditional extrasolar planet detection technology is to use a high-precision cross-dispersion echelle grating spectrometer to accurately measure the extremely small Doppler frequency shift to extract the radial velocity signal, but to achieve high resolution requires a large-aperture telescope to obtain enough light Not only the cost of equipment development is high, but also the technology is difficult and the instrument is easily affected by the environment. The coherent dispersion technology determines the radial velocity by measuring the phase change of the interference fringes formed by...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01J3/28
CPCG01J3/2823
Inventor 管守鑫魏儒义刘学斌张志军狄腊梅陈莎莎
Owner XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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