Color multiplexing passive sensor array

Details Color multiplexing passive sensor array Color multiplexing passive sensor array

1981-12-08

1985-05-14

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250227, 455610, G01J 334

Patent

active

045174563

ABSTRACT:
Apparatus for gathering data about a plurality of chemical or physical conditions, e.g. on industrial plants, utilizes a plurality of passive optical sensors. Light for the sensors is provided by a common broadband source, and distributed by an optical fiber from which light of a selected color is withdrawn for each sensor in turn, the color selected for each sensor being different from that selected for the other sensors. Each color is modified by its respective sensor as a function of changes in the conditions applied to the sensor, and all the modified colors are conveyed along a common data bus to be demultiplexed and the data displayed. The colors may be supplied by the data bus to detection means simultaneously or sequentially. Passive optical sensors avoid electrical interference and incendiary risks due to electrical sparking, and color multiplexing avoids difficulties associated with other forms of multiplexing in plant environments.

REFERENCES:
patent: 3845294 (1974-10-01), Indig et al.
patent: 3953727 (1976-04-01), D'Auria et al.
patent: 4223216 (1980-09-01), Quick et al.
patent: 4247202 (1981-01-01), Failes

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