Temperature measuring apparatus

Details Temperature measuring apparatus Temperature measuring apparatus

1985-09-04

1986-12-09

Yasich, Daniel M.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250231R, 356 43, 374161, G02F 101, G01K 1114

Patent

active

046281967

ABSTRACT:
Apparatus which measures temperature in the high voltage environment of an electrical generator includes a temperature sensing element which includes a polarizing filter rotatable as a function of temperature. Light from a source is passed through the filter and the polarized light is again polarized through the use of a constantly rotating second polarizing filter behind which is a detector operable to provide an AC signal as a function of the doubly polarized light intensity. A reference beam is passed through the second rotating filter as well as a manually rotatable polarizing filter and is detected so as to provide a second AC signal. After an initialization, the AC signals are compared in phase, with the phase difference between them being a function of the temperature being measured.

REFERENCES:
patent: 3081399 (1963-03-01), Schwarz
patent: 3584959 (1971-06-01), Del Carlo
patent: 4053232 (1977-10-01), Dill

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