Fluid index of refraction sensor

Details Fluid index of refraction sensor Fluid index of refraction sensor

1990-07-11

1992-01-21

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356133, H01J 516

Patent

active

050830180

ABSTRACT:
An index of refraction sensor having a photo detector array with variable sized elements is provided. The photo diode array comprises a plurality of diodes with varying area. The diodes farthest from a light emitting diode having a larger area than those closer to the light emitting diode. Preferably the diode area is designed so that each of the diodes produces approximately the same current output when exposed to light from the LED. Each diode in the photo diode array is sequentially powered and the photo diode outputs are summed together. A power input from a first diode in the array is coupled to a start input of a time measurement circuit. The summed output of the photo diode array is coupled to a stop input of the time measurement circuit. Elapsed time measured by the time measurement circuit is thus a function of reflected light edge location, and therefore a function of index of refraction of the fuel mixture.

REFERENCES:
patent: 4672196 (1987-06-01), Canino
patent: 4824244 (1989-04-01), Miyata et al.
patent: 4895444 (1990-01-01), Miyata et al.

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