Process and arrangement for optically measuring a physical quant

Details Process and arrangement for optically measuring a physical quant Process and arrangement for optically measuring a physical quant

1989-08-24

1990-08-07

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250226, H01J 516

Patent

active

049470388

ABSTRACT:
In a process and arrangement for measuring a physical quantity using an optical sensor, for imparting a power modulation proportional to the measured quantity on an effective light flux, the physical quantity being obtained from a ratio of the luminous power of the effective light flux to that of a reference light flux, to achieve a high path neutrality of an optical transmission path, the spectral distribution S(.lambda.) of the effective light flux and the spectral distribution R(.lambda.) of the reference light flux is selected according to the relation: ##EQU1## with .lambda.min<.lambda..sub.1 <.lambda..sub.2 <.lambda. max, the light source being emitting in the wave range between the wavelengths .lambda.min and .lambda.max.

REFERENCES:
patent: 4607158 (1986-08-01), Ovren
patent: 4616137 (1986-10-01), Goff et al.
patent: 4705354 (1987-11-01), Ulrich
patent: 4880972 (1989-11-01), Brogardh et al.

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