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Title: Fiber optic geophysical sensors

A fiber optic geophysical sensor is described in which laser light is passed through a sensor interferometer in contact with a geophysical event, and a reference interferometer not in contact with the geophysical event but in the same general environment as the sensor interferometer. In one embodiment, a single tunable laser provides the laser light. In another embodiment, separate tunable lasers are used for the sensor and reference interferometers. The invention can find such uses as monitoring for earthquakes, and the weighing of objects. 2 figures.
Authors:
Publication Date:
OSTI Identifier:
7027163
Report Number(s):
US 5001337; A
PPN: US 7-506741
DOE Contract Number:
W-7405-ENG-36
Resource Type:
Patent
Resource Relation:
Patent File Date: 10 Apr 1990
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION; 58 GEOSCIENCES; EARTHQUAKES; DETECTION; INTERFEROMETERS; DESIGN; SEISMIC DETECTORS; FIBER OPTICS; LASER RADIATION; WEIGHT MEASUREMENT; ELECTROMAGNETIC RADIATION; MEASURING INSTRUMENTS; RADIATIONS; SEISMIC ARRAYS; SEISMIC EVENTS 440700* -- Geophysical & Meteorological Instrumentation-- (1990-); 580000 -- Geosciences