Optics: measuring and testing – Refraction testing – Prism engaging specimen
Patent
1990-12-12
1991-09-10
Evans, F. L.
Optics: measuring and testing
Refraction testing
Prism engaging specimen
356133, G01N 2142
Patent
active
050468421
ABSTRACT:
A mixing ratio detecting device for composite liquid has a transparent column placed so that a bottom of the column is in contact with a mixing liquid, and a light emitting diode disposed so that light beams therefrom are incident on one side of the column to pass therethrough so as to impinge on an interface between the bottom of the column and the mixing liquid. The light beams impinged on the interface less than a critical angle are refracted, while the light beams impinged on the interface more than the critical angle totally reflected to escape from other side of the column. A photo diode is provided to receive the light beams escaped from the other side of the column so as to generate an output. An effective photo-receiving area of the photo diode is in the form of an inversed trapezoid to compensate for characteristics of the output from the photo diode.
REFERENCES:
patent: 4749274 (1988-06-01), Aoki et al.
patent: 4962746 (1990-10-01), Miyata et al.
Miyata Shigeru
Yamada Yoshitaka
Evans F. L.
NGK Spark Plug Co. Ltd.
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