Collection system of long-distance wide-spectrum weak signal based on large-aperture Fresnel lens

Abstract

The invention provides a long-distance wide-spectrum weak signal collection system based on a large-aperture Fresnel lens, including a large-aperture Fresnel lens and a rear group system of the large-aperture Fresnel lens, and the large-aperture Fresnel lens The rear group system includes a non-imaging optical element rear group and an imaging optical element rear group; the non-imaging optical element rear group includes a uniform light rod and a total reflection collimator; the imaging optical element rear group includes a relay lens group; The large-aperture Fresnel lens, uniform light rod, total reflection collimator and relay lens group are sequentially arranged along the optical path. The present invention adopts large-aperture Fresnel lens to replace ordinary lens array, which effectively reduces the weight and manufacturing cost of the lens, and has a simple structure and is easy to assemble and adjust; the rear group system of the large-aperture Fresnel lens adopts a mixture of imaging optics and non-imaging optics The design effectively overcomes the shortcomings of the large aberration of the large-aperture Fresnel lens, reduces the diameter of the converging spot, and improves the energy collection rate.

Description

Technical field [0001] The present invention relates to the field of optical design in the optical field, and more particularly to a collection system of a long-distance wide-ranging-length spectra of a large pore diameter Fresnel lens. Background technique [0002] In order to meet the application requirements of the spectral remote sensing technology in the field of pollutant detection, target identification, the optical technique such as laser radar is usually used, and a certain amount of laser beam is remotely focused to the detected area, and the fluorescence spectrum of the substance in the area is excited. The fluorescence spectroscopy distribution and intensity is a mapping relationship with the molecular structure and concentration of the detected substance, and can achieve remote sensing detection of material components and concentrations in the region in the region by collecting fluorescence spectroscopy. For the long-distance long distance, multi-component low concen...

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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