Optics: measuring and testing – Refraction testing – Prism engaging specimen
Patent
1989-08-30
1991-09-17
Rosenberger, Richard A.
Optics: measuring and testing
Refraction testing
Prism engaging specimen
356128, 356136, 250574, 123613, G01N 2141
Patent
active
050489526
ABSTRACT:
A liquid mixing ratio detecting sensor has cylindrical holder which is immersed in sulfuric acid solution. The holder is filled with silicone oil. A glass plate is placed within the holder. A light emitting diode emits light beams which enter the glass plate through its vertical side, and totally reflect from a boundary between the glass plate and the sulfuric acid solution. The light beams coming out from the glass plate is reflected by a reflection plate to enter into the glass plate through its vertical side, and totally reflected from a reference boundary between the glass plate and the silicone oil when a refractive index of the sulfuric acid solution is greater than that of silicone oil. On the other hand, the light beams entered into the glass plate refracts at the reference boundary to fall on a photo diode when the refractive index of the sulfuric acid solution decreases to be smaller than that of silicone oil.
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An Optical Probe for Detecting Liquid Interfaces, Instrument Physics Group, Department of Pure and Applied Physics, J. E. Geake, 3-1975.
Miyata Shigeru
Yamada Yoshitaka
NGK Spark Plug Co. Ltd.
Pham Hoa
Rosenberger Richard A.
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