Opto-electronic instrument for remote temperature measurement

Details Opto-electronic instrument for remote temperature measurement Opto-electronic instrument for remote temperature measurement

1979-09-24

1981-10-20

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250231R, 73355R, G02F 101

Patent

active

042963184

ABSTRACT:
An opto-electronic instrument for remote temperature measurement having a measuring probe and a remote supply processing unit connected together by at least one optical fibre. The measuring probe includes at least one polarizer and a temperature sensitive element for receiving, modifying and retransmitting a luminous signal through the fibre which signal has been received from the luminous signal generator of the remote supply processing unit, which unit also includes a variable frequency filter controlled by a ramp generator for transforming the retransmitted luminous signal into a luminous signal, the intensity of which varies sinusoidally with time, and an opto-electrical transducer able to convert this latter luminous signal into a corresponding electrical signal of sinusoidal oscillation for which signal the period of oscillation is then calculated.

REFERENCES:
patent: 3453434 (1969-07-01), Takami et al.
patent: 3950987 (1976-04-01), Slezinger et al.
patent: 4140393 (1979-02-01), Cetas

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