Optics: measuring and testing – Refraction testing
Patent
1988-04-12
1990-01-23
Evans, F. L.
Optics: measuring and testing
Refraction testing
356136, G01N 2141
Patent
active
048954446
ABSTRACT:
A detector device for determining the mixing ratio of gasoline and alcohol includes a flint glass plate, one side of which is placed to be in direct contact with a mixing liquid of gasoline and alcohol, a light emitting diode is located at the other side of the flint glass plate to be opposite to the mixing liquid so that light beams emitted from the diode enter the flint glass plate to be incident on a boundary between the plate and the mixing liquid and a photo diode having a rectangular shape and located in coplanar relationship with the light emitting diode to receive the light beams totally reflected from the boundary. The distance between the photo diode and the light emitting diode and the width dimension of the photo diode are determined such to provide incident angles ranging from a minimum corresponding to the critical angle when the mixing liquid ratio is at lower limit of the predetermined range to a maximum corresponding to the critical angle when the mixing liquid ratio is at upper limit of the predetermined range.
REFERENCES:
patent: 4438749 (1984-03-01), Schwippert
patent: 4749274 (1988-06-01), Aoki et al.
Matsubara Yoshihiro
Miyata Shigeru
Evans F. L.
NGK Spark Plug Co. Ltd.
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