Communications – electrical: acoustic wave systems and devices – Borehole testing
Patent
1979-12-26
1982-12-14
Lee, John D.
Communications, electrical: acoustic wave systems and devices
Borehole testing
350 9629, 350358, 367141, G02B 5172, G02F 100
Patent
active
043635334
ABSTRACT:
An optical transducer (10) having a plurality of concentric cores (15,17). An intermediate cladding (16) is disposed between the inner and outer cores and an outer cladding (18) surrounds the outer core to define a symmetrical cylindrical transducer structure. Light propagated through the inner core (15) from a source (19) is coupled into the outer core (17) as a result of penetration of the evanescent electric field from the light in the inner core through the inner cladding (16) to the outer core. Control of the coupling length may be effected by suitable selection of the transducer structure parameters. At least one of the portions of the transducer is formed of an acousto-optically variable material whereby an acoustic field acting on the transducer causes a modulation of the coupled light so as to provide in the outer core (17) a modulated light signal suitable for detection by a receiver (21). Localized control of the parameters of the transducer may be effected to provide focusing of the coupled light. An electrical signal may be provided for controlling the coupling between the core portions.
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Christian, deceased John D.
Christian, heir by Albert
Christian, heir by David A.
Christian, heir by Martha R.
Stowe David W.
Gould Inc.
Huberfeld Harold
Lee John D.
Pierce K. H.
Sachs Edward E.
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