Large-aperture Fresnel lens-based long-distance wide-spectrum weak signal collection system

Abstract

The invention provides a large-aperture Fresnel lens-based long-distance wide-spectrum weak signal collection system. The system comprises a large-aperture Fresnel lens and a rear group system of thelarge-aperture Fresnel lens; the rear group system of the large-aperture Fresnel lens comprises a non-imaging optical element rear group and an imaging optical element rear group; the non-imaging optical element rear group comprises a light uniformizing rod and a total reflection collimator; and the imaging optical element rear group comprises a relay lens group; the large-aperture Fresnel lens, the light uniformizing rod, the total reflection collimator and the relay lens group are sequentially arranged along an optical path. According to the large-aperture Fresnel lens-based long-distance wide-spectrum weak signal collection system, the large-aperture Fresnel lens is adopted to replace a common lens array, and therefore, the weight and manufacturing cost of the lens are effectively reduced, the system is simple in structure and is easy to install and adjust; the rear group system of the large-aperture Fresnel lens adopts imaging optics and non-imaging optics, so that the defect thatthe large-aperture Fresnel lens is large in aberration is effectively eliminated, the diameter of a convergent light spot is reduced, and an energy collection rate is improved.

Description

Technical field [0001] The invention relates to the field of optical design in the optical field, in particular to a long-distance wide-spectrum weak signal collection system based on a large-aperture Fresnel lens. Background technique [0002] In order to meet the application requirements of spectral remote sensing technology in pollutant detection, target recognition and other fields, optical technology such as lidar is usually used to remotely focus a certain energy laser beam to the detected area to excite the fluorescence spectrum of the substance in the detected area. There is a mapping relationship between the fluorescence spectrum distribution and intensity and the molecular structure and concentration of the detected substance. Remote sensing detection of the substance composition and concentration in the detected area can be realized by collecting the fluorescence spectrum information. For kilometer-level long-distance, multi-component low-concentration spectral remote ...

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the problems of difficult processing and assembly, high cost, and low energy collection efficiency in the signal collection system in the prior art when collecting long-distance wide-spectrum weak signals, the present invention provides a Fresnel lens based on large aperture A long-distance wide-spectrum weak signal collection system to solve the above-mentioned problems in the prior art, reduce the difficulty and cost of signal collection system installation and adjustment, and improve energy collection efficiency

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