Fiber optic diaphragm sensors for engine knock and misfire detec

Details Fiber optic diaphragm sensors for engine knock and misfire detec Fiber optic diaphragm sensors for engine knock and misfire detec

1993-07-01

1995-02-21

Williams, Hezron E.

Measuring and testing

Fluid pressure gauge

Diaphragm

73116, 25023119, G01L 708

Patent

active

053905466

ABSTRACT:
The modulation depth of a fiber optic diaphragm sensor is increased by tapering the tip end of the optical fiber or fiber bundle. In a second embodiment, the modulation depth is increased by mechanically leveraging the diaphragm movement relative to the tip end of the optical fiber or fiber bundle. In either embodiment, the operating temperature of the tip end of the optical fiber or fiber bundle can be reduced relative to the operating temperature of the diaphragm. Thus, the diaphragm sensor can be directly exposed to combustion temperatures in an internal combustion engine and advantageously the sensor can be embodied in a spark plug adjacent the electrodes.

REFERENCES:
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patent: 4521683 (1985-06-01), Miller
patent: 4620093 (1986-10-01), Barkhoudarian et al.
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patent: 4932262 (1990-06-01), Wlodarczyk
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patent: 5052214 (1991-10-01), Dils
patent: 5072617 (1991-12-01), Weiss
"Microbending Losses of Metal Coated Single Mode . . . "; Society of Photooptical Instrumentation Engineers; vol. 985, (1988).
"A Fiber Optic Sensor for Combustion Pressure Measurement . . . "; Society of Photooptical Instrumentation Engineers; vol. 840, (1987).

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