Optical: systems and elements – Optical modulator – Light wave temporal modulation
Patent
1997-05-16
1998-09-15
Hellner, Mark
Optical: systems and elements
Optical modulator
Light wave temporal modulation
359188, 385 1, 385 12, 356 32, 367 81, G02B 2600, G01F 101, G01B 1116
Patent
active
058087796
ABSTRACT:
This invention is directed toward a fiber optic modulation and demodulation system, and more particularly directed toward a telemetry system for relaying signals from sensors in remote, harsh environments. Light is modulated using one or more optical reflective grating and piezoelectric crystal combinations, and demodulated using an interferometer system. The one or more modulators are driven by the responses of one or more sensors thereby modulating one or more carrier wavelengths of a carrier light source. The modulated light signal is transmitted from the sensor or sensors, over an optical fiber, to an interferometer which is used to demodulate the reflected signals and thereby determine the responses of one or more sensors. One embodiment of the invention set forth is that of a telemetry system linking sensors within a borehole to detection and processing equipment at the surface of the earth.
REFERENCES:
patent: 4996419 (1991-02-01), Morey
patent: 5467212 (1995-11-01), Huber
patent: 5675674 (1997-10-01), Weis
Hellner Mark
Rock Bit International
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