Optics: measuring and testing – By particle light scattering – With photocell detection
Patent
1984-06-11
1986-12-30
McGraw, Vincent P.
Optics: measuring and testing
By particle light scattering
With photocell detection
250227, G01B 902
Patent
active
046325514
ABSTRACT:
This invention provides a sensor array using a plurality of fiber optic sensors connected between transmit fibers and receive fibers. The laser transmitter supplies pulses to the transmit fiber and fiber optic couplers couple the pulses from the transmit fiber into the fiber optic sensors. The pulses from the laser transmitter may be frequency chirped or frequency stepped to provide passive sampling of interferometric sensors in addition to intensity sensors, or otherwise frequency modulated. Each sensor is configured to respond to changes in a predetermined physical parameter by altering the shape of the pulse input thereto. Fiber optic couplers couple the sensor output signals into the receive fiber for input to a receiver, which converts the optical signals into electrical signals for input to a processer. A timing reference correlates the sensor output pulses with the sensors.
REFERENCES:
patent: 4443700 (1984-04-01), Macedo et al.
patent: 4505587 (1985-03-01), Haus et al.
"Passive Multiplexing Systems for Fiber Optic Sensors", Nelson et al., Applied Optics, 9-1980, pp. 2917-2920.
"Passive Multiplexing Techniques for Fiber Optic Sensor Systems", Nelson et al., I.F.O.C., 3-1981, pp. 27-30.
Litton Systems Inc.
Lynn John H.
McGraw Vincent P.
Turner S. A.
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