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Title: Compensated vibrating optical fiber pressure measuring device

Abstract

A microbending optical fiber is attached under tension to a diaphragm to se a differential pressure applied across the diaphragm which it causes it to deflect. The fiber is attached to the diaphragm so that one portion of the fiber, attached to a central portion of the diaphragm, undergoes a change in tension; proportional to the differential pressure applied to the diaphragm while a second portion attached at the periphery of the diaphragm remains at a reference tension. Both portions of the fiber are caused to vibrate at their natural frequencies. Light transmitted through the fiber is attenuated by both portions of the tensioned sections of the fiber by an amount which increases with the curvature of fiber bending so that the light signal is modulated by both portions of the fiber at separate frequencies. The modulated light signal is transduced into a electrical signal. The separate modulation signals are detected to generate separate signals having frequencies corresponding to the reference and measuring vibrating sections of the continuous fiber, respectively. A signal proportional to the difference between these signals is generated which is indicative of the measured pressure differential across the diaphragm. The reference portion of the fiber is usedmore » to compensate the pressure signal for zero and span changes resulting from ambient temperature and humidity effects upon the fiber and the transducer fixture.« less

Inventors:
 [1];  [2]
  1. Morgantown, WV
  2. Christiansburg, VA
Issue Date:
Research Org.:
National Energy Technology Laboratory (NETL), Pittsburgh, PA, Morgantown, WV (United States)
OSTI Identifier:
866259
Patent Number(s):
4667097
Assignee:
United States of America as represented by Department of Energy (Washington, DC)
Patent Classifications (CPCs):
G - PHYSICS G01 - MEASURING G01L - MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
compensated; vibrating; optical; fiber; pressure; measuring; device; microbending; attached; tension; diaphragm; differential; applied; causes; deflect; portion; central; undergoes; change; proportional; periphery; remains; reference; portions; caused; vibrate; natural; frequencies; light; transmitted; attenuated; tensioned; sections; amount; increases; curvature; bending; signal; modulated; separate; transduced; electrical; modulation; signals; detected; generate; corresponding; continuous; respectively; difference; generated; indicative; measured; compensate; zero; span; changes; resulting; ambient; temperature; humidity; effects; transducer; fixture; pressure signal; modulation signal; reference portion; signal proportional; electrical signal; optical fiber; pressure differential; ambient temperature; measuring device; differential pressure; central portion; light signal; pressure applied; light transmitted; measured pressure; modulated light; continuous fiber; pressure measuring; /250/73/385/

Citation Formats

Fasching, George E, and Goff, David R. Compensated vibrating optical fiber pressure measuring device. United States: N. p., 1987. Web.
Fasching, George E, & Goff, David R. Compensated vibrating optical fiber pressure measuring device. United States.
Fasching, George E, and Goff, David R. Thu . "Compensated vibrating optical fiber pressure measuring device". United States. https://www.osti.gov/servlets/purl/866259.
@article{osti_866259,
title = {Compensated vibrating optical fiber pressure measuring device},
author = {Fasching, George E and Goff, David R},
abstractNote = {A microbending optical fiber is attached under tension to a diaphragm to se a differential pressure applied across the diaphragm which it causes it to deflect. The fiber is attached to the diaphragm so that one portion of the fiber, attached to a central portion of the diaphragm, undergoes a change in tension; proportional to the differential pressure applied to the diaphragm while a second portion attached at the periphery of the diaphragm remains at a reference tension. Both portions of the fiber are caused to vibrate at their natural frequencies. Light transmitted through the fiber is attenuated by both portions of the tensioned sections of the fiber by an amount which increases with the curvature of fiber bending so that the light signal is modulated by both portions of the fiber at separate frequencies. The modulated light signal is transduced into a electrical signal. The separate modulation signals are detected to generate separate signals having frequencies corresponding to the reference and measuring vibrating sections of the continuous fiber, respectively. A signal proportional to the difference between these signals is generated which is indicative of the measured pressure differential across the diaphragm. The reference portion of the fiber is used to compensate the pressure signal for zero and span changes resulting from ambient temperature and humidity effects upon the fiber and the transducer fixture.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1987},
month = {1}
}

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