Spectral line discriminator for passive detection of fluorescenc

Details Spectral line discriminator for passive detection of fluorescenc Spectral line discriminator for passive detection of fluorescenc

1995-06-01

1996-10-22

Fields, Carolyn E.

Radiant energy

Luminophor irradiation

2504591, G01N 2164

Patent

active

055679471

ABSTRACT:
A method and apparatus for detecting fluorescence from sunlit plants is based on spectral line discrimination using the A-band and B-band absorption of atmospheric oxygen. Light from a plant including scattered sunlight and the fluorescence from chlorophyll is passed through a chopper into a cell containing low-pressure, high-purity oxygen. A-band or B-band wavelengths present in the light are absorbed by the oxygen in the cell. When the chopper is closed, the absorbed light is remitted as fluorescence into a detector. The intensity of the fluorescence from the oxygen is proportional to the intensity of fluorescence from the plant.

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Article, J. C. McFarlane, et al., Plant stress detection by remote measurement of fluorescence, Oct. 1980/vol. 19, No. 19/Applied Optics, pp. 3287-3289.

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