Optical sensor having stationary co-terminus ends of the input a

Details Optical sensor having stationary co-terminus ends of the input a Optical sensor having stationary co-terminus ends of the input a

1987-12-10

1989-08-29

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250231R, H01J 516, H01J 4014

Patent

active

048619809

ABSTRACT:
A spectral filtering optical sensor comprises a stationary zone plate and stationary co-terminous ends of input and output fibres with the interposition in the optical path between the zone plate and the optical fibre ends of a variable optical focussing arrangement the focussing characteristics of which change with changes in magnitude of the particular parameter being sensed and thereby vary the effective optical path length between the zone plate and the optical fibre ends and the wavelength of light impinging on the end of the output fibre.

REFERENCES:
patent: 3564264 (1971-02-01), Karuhn
patent: 4223216 (1980-09-01), Quick et al.
patent: 4408123 (1983-10-01), Sichling et al.
patent: 4427881 (1984-01-01), Ruell
patent: 4564755 (1986-01-01), Winzer et al.
patent: 4666304 (1987-05-01), Davies
patent: 4694160 (1987-09-01), Hoogenboom et al.
patent: 4737624 (1988-04-01), Schwarte

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