Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1991-07-24
1992-07-07
Howell, Janice A.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
25023119, 359 70, G01L 124
Patent
active
051285355
ABSTRACT:
The method is for measurement of pressure applied to a sensing element comprising a cholesteric liquid crystal being connected to multimode optical fibers for communication with a light source and a device for measurement of light intensity. The method resides in guiding a light beam of predetermined wavelength generated by the light source toward a layer of the cholesteric liquid crystal using one of the multimode optical fibers. The light beam reflected by the layer is collected using another of the multimode optical fibers being connected to the device for measurement of light intensity. This device measures then the intensity of the reflected light beam, such that a value indicative of the pressure as a function of the measured intensity can be carried out. This method is particularly well adapted for measuring pressure up to 100 MPa with a good linear response and sensitivity for specific ranges of pressure useful in industrial applications.
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"Die Druckabhaengigkeit der linearen Doppelbrechung eines cholesterischen Flussigkristalls. Optische Rotation und Selektivreflexion einer Mischung von Cholesterylnonanoat und Cholesterychlorid von 60.degree.-130.degree. C. und bis 3 kbar" by P. Pollman und P. Wiege, Ber. Bunsenges, Phys. Chem., 88, 612-616 (1984)--Verlag Chemie GmbH, D-6940 Weinheim, 1984, pp. 612-616.
Bock Wojtek J.
Wolinski Tomasz R.
Beyer James
Howell Janice A.
Universite Du Quebec A Hull
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