Spectral line discriminator for passive detection of fluorescence
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United States of America Patent
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Oct 22, 1996
Grant Date -
N/A
app pub date -
Jun 1, 1995
filing date -
Jun 1, 1995
priority date (Note) -
Expired
status (Latency Note)
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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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