A High Resolution, High Numerical Aperture Imaging Spectrometer for Passive Detection of Faint Fluorescence in Vegetation

Abstract

The invention discloses a high-resolution high-value hole diameter imaging spectrometer for plant weak fluorescence passive detection. The imaging spectrometer is sequentially provided with a slit, afirst lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a plane transmission grating, an eighth lens, a ninth lens, a tenth lens, an eleventh lens, a twelfth lens, a thirteenth lens and an image surface, wherein the first to sixth lenses form a collimation lens group; the eighth to thirteenth lenses form a focusing lens group. The hole diameter grating is positioned onthe plane lens grating; the collimation lens group projects slit emergent light onto the plane transmission grating; the plane transmission grating performs chromatic dispersion on the collimation light; a continuous chromatic dispersion spectrum is formed through the focusing lens group and is imaged on the image surface. The optical system has high value hole diameter and high resolution; the forming elements are simple; the processing and the manufacturing are easy; the assembly is easy; the imaging quality is excellent; the whole view field whole wave band mean square root point range figure is realized; the radius value is smaller than 6.5 mum; the imaging aberration is lower than 0.5 percent.

Description

technical field [0001] The invention belongs to the technical field of hyperspectral imaging, and in particular relates to an imaging spectrometer with high resolution and high numerical aperture for passive detection of weak fluorescence of vegetation. Background technique [0002] High resolution and high numerical aperture imaging spectrometers play an important role in the research field of passive detection of vegetation sunlight-induced weak fluorescence. Although the weak fluorescence emitted by vegetation under sunlight is weak, it can accurately reflect the photosynthetic ability of plants, and it can also reflect the tolerance of plants to environmental stress and the degree of damage caused by stress to plant organs. This characteristic makes fluorescence completely As an early "probe" of plant health and damage to photosynthetic function, through the passive detection of this weak fluorescence, early forecasts can be made when crops are damaged by stress factors,...

AI Technical Summary

Problems solved by technology

[0004] 2. The radiation intensity of fluorescence spectrum is extremely weak, accounting for only 1%-3% of the total energy absorbed by vegetation leaves. Therefore, the requirements for energy transmission and signal-to-noise ratio of the instrument are high, and the numerical aperture of the system needs to reach more than 0.25;

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