Light sensor

Details Light sensor Light sensor

1979-04-23

1981-04-28

Corbin, John K.

Optics: measuring and testing

For light transmission or absorption

250227, 356213, 356222, 356380, G01N 2101, G01B 1128

Patent

active

042642116

ABSTRACT:
To measure the density of a foilage canopy, an elongated average-light measuring instrument includes an elongated diffuser, an elongated quartz rod with a uniform diffusing groove in it between it and the diffuser and a photodiode at one end so that radiation hitting the diffuser enters the quartz rod and is transmitted to the photodiode to provide a measure of average light entering the length of the instrument. To digitize light instead of sensing average light, another embodiment includes a plurality of separate light entrances positioned along the length of the quartz rod and a scanner that scans across the rod or a uniform diffusing groove and circuitry that digitizes the electrical signal from the photodiode periodically in accordance with the position of the light scanner on the groove.

REFERENCES:
patent: 2360663 (1944-10-01), Eddy
patent: 3060319 (1962-10-01), Greunke
patent: 3317738 (1967-05-01), Piepenbrink et al.
patent: 3980893 (1976-09-01), Merlen
patent: 4004152 (1977-01-01), Obser et al.

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