Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1985-02-22
1987-07-21
LaRoche, Eugene R.
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
455612, G02B 628, G02F 1015
Patent
active
046813950
ABSTRACT:
Disclosed is a fiber optic sensing system wherein a pulsed light source signal (12) propagates along a single optical waveguide (14) and is split into component signals (20) and (22) at a sensor unit (16). The intensity of one component signal (20) is varied by a transducer (28) through which the signal passes. The second, reference, component signal (22) passes through a delay optical fiber (30) and has its propagation delayed with respect to the other component signal (20). The delayed and undelayed component signals are then coupled and propagate along a single waveguide (34) to a receiver (36). The system is constructed so that intensity-varying factors inherent in the system, other than the sensor-induced variations, are identically shared by the two component signals. Accordingly, signal processing circuitry (38) calculates a simple ratio of the delayed and undelayed signals which yields the sensor-intensity variation independent of any other intensity-varying factors.
REFERENCES:
patent: 4089584 (1978-05-01), Polczynski
patent: 4182935 (1980-01-01), Chown
patent: 4294513 (1981-10-01), Nelson et al.
patent: 4313192 (1982-01-01), Nelson et al.
patent: 4375680 (1983-03-01), Cahill et al.
patent: 4420752 (1983-12-01), Davis et al.
patent: 4430572 (1984-02-01), Eve et al.
patent: 4432599 (1984-02-01), McMahon
patent: 4436995 (1984-03-01), Whitten
Conference Proceedings from the 2nd International Conference on Optical Fiber Sensors held on Sep. 5-7, 1984 at Liederhalle Stuttgart, Fed. Republic of Germany.
Lindsay Thomas A.
Morton Randall E.
ELDEC Corporation
LaRoche Eugene R.
Mottola Steven J.
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