Optical: systems and elements – Optical modulator – Light wave temporal modulation
Patent
1998-09-02
2000-10-24
Williams, Hezron
Optical: systems and elements
Optical modulator
Light wave temporal modulation
181102, 367 32, 367 26, G02B 2600
Patent
active
061376213
ABSTRACT:
The present invention relates to an acoustic logging system having a sonde for arranging in a borehole of a well such as an oil well. The sonde has at least one transmitter for providing at least one transmitter acoustic signal, and has receivers for responding to the at least one transmitter acoustic signal, for providing receiver signals containing information about properties of earth formations in the borehole. The acoustic logging system features one or more transducers, a light source, an optical fiber and a detection and management unit. The one or more transducers responds to the receiver signals from the receiver of the sonde, for providing one or more mechanical transducer forces containing information about the receiver signals. At least one transducer may be a piezoelectric or magnetostrictive transducer. The light source provides an optical signal. The optical fiber responds to the one or more mechanical transducer forces, for changing an optical parameter or characteristic of the optical signal depending on the change in length of the optical fiber, and providing a transduced optical signal containing information about the one or more mechanical transducer forces from the one or more transducers. The optical fiber is wrapped around the one or more transducers and bonded thereon. The detection and management unit has a signal processor, responds to the transduced optical signal, and provides a detection and management unit signal containing information about the properties of earth formations in the borehole.
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Jolly Anthony
Williams Hezron
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