Measuring and testing – Vibration – Sensing apparatus
Patent
1984-11-05
1986-05-20
Ciarlante, Anthony V.
Measuring and testing
Vibration
Sensing apparatus
367149, G01N 2900
Patent
active
045892857
ABSTRACT:
An optical telemetric system for use in a borehole consists of a bidirectional optical fiber to which are coupled a plurality of acousto-optical seismic sensors. The sensors consist of an optical cavity that becomes resonant at certain wavelengths depending upon parameters of cavity length and index of refraction. Those parameters are capable of being modified on the basis of static and dynamic pressure differences within the borehole. A swept-wavelength laser chirp pulse is launched into the bidirectional optical fiber. The static pressure at each sensor establishes a resonant wavelength that serves as a carrier signal. Dynamic pressure changes due to seismic waves, modulate the carrier signal. The modulated carrier signals from each sensor are reradiated through the bidirectional optical fiber in a wavelength-division multiplexed format. The multiplexed signals are received by and demultiplexed by a suitable signal receiving apparatus.
REFERENCES:
patent: 4238856 (1980-12-01), Bucaro et al.
patent: 4302835 (1981-11-01), McMahon
patent: 4320475 (1982-03-01), Leclerc et al.
patent: 4375680 (1983-03-01), Cahill et al.
patent: 4469397 (1984-09-01), Shaw
patent: 4525818 (1985-06-01), Cielo et al.
Ciarlante Anthony V.
Knox William A.
Western Geophysical Co. of America
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