Measuring and testing – Gas analysis – Moisture content or vapor pressure
Patent
1977-07-14
1978-09-05
Gorenstein, Charles
Measuring and testing
Gas analysis
Moisture content or vapor pressure
73356, 356114, G01K 1114
Patent
active
041110501
ABSTRACT:
A thermometer arrangement in which the active element is a block of birefringent material between two optical planar polarizers. Light energy from a source is conducted through a fiber optic light conductor through the input polarizer, the birefringent element, the output polarizer, and via a second fiber optic light conductor, into a light-to-electrical transducer. Polarization plane rotation effected by the birefringent element in combination with the fixed polarizers effectively modulates the light intensity from an arbitrary level (such as substantially zero at some selected temperature) so that the transducer output signal is a function of temperature. A reference accounting for light source variations, etc. is provided by a separate fiber optic conductor, a second transducer, and a differential detector. Linearizing means are also shown.
REFERENCES:
patent: 3950987 (1976-04-01), Slezinger et al.
patent: 3960017 (1976-06-01), Romanowski
patent: 4016761 (1977-04-01), Rozzell et al.
Gorenstein Charles
International Telephone and Telegraph Corporation
O'Neil William T.
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