Detector device for mixing ratio for gasoline and alcohol or the

Details Detector device for mixing ratio for gasoline and alcohol or the Detector device for mixing ratio for gasoline and alcohol or the

1988-02-26

1990-03-27

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250577, 356136, H01J 516, G01N 2141

Patent

active

049123190

ABSTRACT:
A detector device for mixing ratio for gasoline and alcohol include an optically permeable column, one end of which is coated with a light-reflective layer. The circumferential surface of the column is at least partly immersed in mixing liquid of gasoline and alcohol.
The light beams enter the column to be incident on said circumferential surface of the column and reflect from the circumferential surface to be incident on said light reflective-layer to reflect therefrom. The reflected light beams impinge on a photo diode which outputs in accordance with the intensity of the light beams impinged.
The diametrical and lengthwise dimension of the column being determined such as to provide incidence angles of the reflected light beams changing from a minimum angle corresponding to the critical angle when the mixing liquid ratio is at the lower limit of the predetermined range to a maximum angle corresponding to the critical angle when the mixing liquid ratio is at the upper limit of the predetermined range.

REFERENCES:
patent: 3639770 (1972-02-01), Zizelmann
patent: 4306805 (1981-12-01), Arrington
patent: 4320291 (1982-03-01), Uramoto
patent: 4451147 (1984-05-01), Dobes et al.
patent: 4699511 (1987-10-01), Seaver
patent: 4704029 (1987-11-01), Van Heuvelen
patent: 4749274 (1988-06-01), Aoki et al.

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