Optical system of sunlight-induced chlorophyll fluorescence detection hyperspectral imager

Abstract

The invention discloses an optical system of a sunlight-induced chlorophyll fluorescence detection hyperspectral imager, and the system comprises a telescope, a slit, a collimating mirror, a holographic phase transmission grating, a focusing mirror and an image surface. The system is an image space telecentric system, the field angle is 20 degrees, and the requirements of general space optical remote sensing can be met; the working wave band is 670 nm-780 nm, and a main detection window of chlorophyll fluorescence induced by the sunlight of the vegetation is covered; the F number of the system can be set to be 1.8-3 according to different requirements to ensure the high luminous flux transmission capacity and the high signal-to-noise ratio of detection of the system; the spectrum sampling of the pixel is 0.05-0.1 nm per pixel, and the spectrum resolution of more than 0.3 nm can be realized; and meanwhile, the optical system of the sunlight-induced chlorophyll fluorescence detection hyperspectral imager has excellent imaging quality, and can obtain relatively abundant vegetation sunlight-induced chlorophyll fluorescence information.

Description

technical field [0001] The invention belongs to the technical field of hyperspectral imaging and the field of space optics, and in particular relates to an optical system of a hyperspectral imager for sunlight-induced chlorophyll fluorescence detection. Background technique [0002] Sunlight-induced chlorophyll fluorescence is a direct characterization of plant photosynthetic productivity. It is called a "probe" for plant health and photosynthesis. Remote sensing fluorescence signals can directly indicate the photosynthetic productivity of plants under stress-free conditions and the degree to which plants are exposed to external environmental stress. It has very important scientific and practical value in the application of vegetation ecology. Sunlight-induced chlorophyll fluorescence is usually submerged in the reflection signal of the vegetation canopy, and its energy only accounts for about 1%. In order to accurately separate this fluorescence spectral information from th...

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Problems solved by technology

At present, the research and development of instruments in this field in my country is in the development stage, and there are no mature products and remote sensing instruments to be applied.

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