Accession Number : ADD014476

Title :   Multiple Axis, Fiber Optic Interferometric Seismic Sensor.

Descriptive Note : Patent, filed 25 Jan 88, Patented 16 Jan 90,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Garrett, Steven L ; Gardner, David L

Report Date : 16 Jan 1990

Pagination or Media Count : 7

Abstract : A mechanical vibration transducer includes a seismic mass is supported by a plurality of cylindrical silicone rubber mandrels. Each mandrel is wound with a length or optical fiber which has a reflective end and a transmissive end. A case surrounds the assemblage and is connected to the supports. When the case is displaced, the supports change diameter in response to the relative motion between the seismic mass and the case. This change in diameter is translated to a change in length of the optical fiber. By using the fibers as arms of a michelson interferometer, a sensitive instrument responsive to displacing vibrations is obtained. This instrument is energized entirely by light transmitted through optical fiber waveguides and whose information is transmitted to the observor using only light waves in optical fibers. Keywords: Patents, PAT-CL-356-345. (kr)

Descriptors :   *SEISMIC DETECTION, *OPTICAL DETECTORS, *MICHELSON INTERFEROMETERS, *PATENTS, CYLINDRICAL BODIES, DIAMETERS, FIBER OPTICS, INSTRUMENTATION, LIGHT, MANDRELS, MASS, MECHANICAL PROPERTIES, MOTION, OPTICAL WAVEGUIDES, SEISMOLOGY, SENSITIVITY, SILICONES, LIGHT TRANSMISSION, SYNTHETIC RUBBER, TRANSDUCERS, VIBRATION, WAVES

Subject Categories : Seismic Detection and Detectors
      Optical Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE