Fiber optic microbend sensor for engine knock and misfire detect

Details Fiber optic microbend sensor for engine knock and misfire detect Fiber optic microbend sensor for engine knock and misfire detect

1993-07-01

1995-06-06

Raevis, Robert

Measuring and testing

Vehicle drive train

Rear end

25022716, 73705, G01L 124

Patent

active

054211956

ABSTRACT:
A washer configuration fiber optic sensor comprising radial ridges in the cavity between the washer halves and an optical fiber spiralled to a terminating end within the cavity. The terminating end is mirrored and an optical filter is inserted in the fiber path adjacent the fiber entrance to the washer. Changing compression loads on the washer microbend the fiber and modulate the measuring light beam admired to the fiber and reflected back through the fiber. The optical filter is located in a connection between the washer and a transmitting fiber. The transmitting fiber both delivers light to the washer and collects light back from the washer. The connector is configured to deliver the measuring light beam to both the core and cladding of the fiber in the washer. However, the connector is configured to strip away the portion of the reflected light beam otherwise delivered to the cladding of the transmitting fiber. A reference light beam of differing wavelength is reflected by the filter. The overall result is enhanced discrimination over noise in the sensor.

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patent: 5052214 (1991-10-01), Dils
"Microbending Losses of Metal Coated Single Mode, . . . "; Society of Photooptical Instrumentation Engineers; vol. 985 (1988).
"A Fiberoptic Sensor for Combustion Pressure Measurement"; Society of Photooptical Instrumentation Engineers, vol. 840 (1987).

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