Communications – electrical: acoustic wave systems and devices – Borehole testing
Patent
1985-04-03
1988-06-07
Lee, John
Communications, electrical: acoustic wave systems and devices
Borehole testing
350 9616, 350 9619, 367141, 370 3, 73170A, 738665, G02B 602, G01H 900
Patent
active
047492546
ABSTRACT:
Present electrical expendable oceanographic instruments are vulnerable to insulation leaks and electromagnetic interference; they are also unable to measure pressure and the index of refraction. In response to these difficulties a unique combination of optical temperature, pressure, and index of refraction sensors have been developed. These sensors are coupled to an optical fiber transmission link which is contained initially within a probe vehicle and is designed to be unreeled. The remote sensing feature of this combination and technique makes the instrument also suitable for industrial and data - and tele-communications use. The principle of the three sensors is that of optical filters, whose band edges are functions of temperature, pressure, and the index of refraction; this wavelength modulation technique avoids drift and allows the signals from the sensors to be wavelength multiplexed in a single optical fiber, and to be read remotely by a single detector.
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