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Title: Fiber optic vibration sensor

A fiber optic vibration sensor utilizes two single mode optical fibers supported by a housing with one optical fiber fixedly secured to the housing and providing a reference signal and the other optical fiber having a free span length subject to vibrational displacement thereof with respect to the housing and the first optical fiber for providing a signal indicative of a measurement of any perturbation of the sensor. Damping or tailoring of the sensor to be responsive to selected levels of perturbation is provided by altering the diameter of optical fibers or by immersing at least a portion of the free span length of the vibration sensing optical fiber into a liquid of a selected viscosity.
Inventors:
 [1];  [2];  [1]
  1. (Harriman, TN)
  2. (Lenoir City, TN)
Issue Date:
OSTI Identifier:
869702
Assignee:
Martin Marietta Energy Systems, Inc. (Oak Ridge, TN) ORNL
Patent Number(s):
US 5381492
Contract Number:
AC05-84OR21400
Research Org:
LOCKHEED MARTIN ENRGY SYST INC
Country of Publication:
United States
Language:
English
Subject:
fiber; optic; vibration; sensor; utilizes; single; mode; optical; fibers; supported; housing; fixedly; secured; providing; reference; signal; free; span; length; subject; vibrational; displacement; respect; indicative; measurement; perturbation; damping; tailoring; responsive; selected; levels; provided; altering; diameter; immersing; portion; sensing; liquid; viscosity; reference signal; optical fibers; fiber optic; optical fiber; single mode; signal indicative; mode optical; selected level; vibration sensor; vibration sensing; sensor utilizes; optic vibration; fibers supported; fixedly secured; /385/73/250/356/