Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1998-03-02
2000-09-05
Le, Que T.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
2505594, 25033911, H01J 4014
Patent
active
061146838
ABSTRACT:
A portable plant chlorophyll imaging system is described which collects light reflected from a target plant and separates the collected light into two different wavelength bands. These wavelength bands, or channels, are described as having center wavelengths of 700 nm and 840 nm. The light collected in these two channels is processed using synchronized video cameras. A controller provided in the system compares the level of light of video images reflected from a target plant with a reference level of light from a source illuminating the plant. The percent of reflection in the two separate wavelength bands from a target plant are compared to provide a ratio video image which indicates a relative level of plant chlorophyll content and physiological stress. Multiple display modes are described for viewing the video images.
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Carter Gregory A.
Spiering Bruce A.
Borda Gary G.
Cox Diana M.
Le Que T.
The United States of Ameria as represented by the Administrator
Vrioni Beth A.
LandOfFree
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