1980-04-14
1982-09-21
Sikes, William L.
G07F 103
Patent
active
043504132
ABSTRACT:
A semi-conductor multi-color tunable filter is created by multiple epitaxial layers of varying composition. An AC modulation voltage is superimposed on a sweep bias to periodically shift the fundamental absorption edge of each individual epitaxial layer. This arrangement permits a unique voltage to be associated with a particular color. A lock-in filter matches colors observed at a detector with the voltage present for a given observation.
REFERENCES:
patent: 3307897 (1967-03-01), Lohmann
patent: 3573653 (1971-04-01), Smiley
patent: 3573654 (1971-04-01), Smiley
patent: 3579130 (1971-05-01), Smiley
patent: 3943552 (1976-03-01), Shannon et al.
patent: 4201954 (1980-05-01), Van der Wal et al.
"Induced Transmission in Absorbing Films Applied to Band Pass Filter Desi Berning et al; Jour. of Opt. Soc. of Amer. vol. 47, No. 3 Mar. '57, 830.
Bottka Nicholas
Lessoff Howard
Beers Robert F.
Jr. Leon Scott
Pritchard Kenneth G.
Sikes William L.
Skeer W. Thom
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