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Title: Elastomer degradation sensor using a piezoelectric material

Abstract

A method and apparatus for monitoring the degradation of elastomeric materials is provided. Piezoelectric oscillators are placed in contact with the elastomeric material so that a forced harmonic oscillator with damping is formed. The piezoelectric material is connected to an oscillator circuit,. A parameter such as the resonant frequency, amplitude or Q value of the oscillating system is related to the elasticity of the elastomeric material. Degradation of the elastomeric material causes changes in its elasticity which, in turn, causes the resonant frequency, amplitude or Q of the oscillator to change. These changes are monitored with a peak height monitor, frequency counter, Q-meter, spectrum analyzer, or other measurement circuit. Elasticity of elastomers can be monitored in situ, using miniaturized sensors.

Inventors:
 [1];  [2]
  1. (Livermore, CA)
  2. (late of Livermore, CA)
Issue Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
OSTI Identifier:
867290
Patent Number(s):
4906917
Assignee:
United States of America as represented by United States (Washington, DC) LLNL
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
elastomer; degradation; sensor; piezoelectric; material; method; apparatus; monitoring; elastomeric; materials; provided; oscillators; placed; contact; forced; harmonic; oscillator; damping; formed; connected; circuit; parameter; resonant; frequency; amplitude; value; oscillating; related; elasticity; causes; changes; change; monitored; peak; height; monitor; counter; q-meter; spectrum; analyzer; measurement; elastomers; situ; miniaturized; sensors; oscillator circuit; measurement circuit; spectrum analyzer; resonant frequency; piezoelectric material; elastomeric material; causes changes; elastomeric materials; /324/310/

Citation Formats

Olness, Dolores U., and Hirschfeld, deceased, Tomas B. Elastomer degradation sensor using a piezoelectric material. United States: N. p., 1990. Web.
Olness, Dolores U., & Hirschfeld, deceased, Tomas B. Elastomer degradation sensor using a piezoelectric material. United States.
Olness, Dolores U., and Hirschfeld, deceased, Tomas B. Mon . "Elastomer degradation sensor using a piezoelectric material". United States. https://www.osti.gov/servlets/purl/867290.
@article{osti_867290,
title = {Elastomer degradation sensor using a piezoelectric material},
author = {Olness, Dolores U. and Hirschfeld, deceased, Tomas B.},
abstractNote = {A method and apparatus for monitoring the degradation of elastomeric materials is provided. Piezoelectric oscillators are placed in contact with the elastomeric material so that a forced harmonic oscillator with damping is formed. The piezoelectric material is connected to an oscillator circuit,. A parameter such as the resonant frequency, amplitude or Q value of the oscillating system is related to the elasticity of the elastomeric material. Degradation of the elastomeric material causes changes in its elasticity which, in turn, causes the resonant frequency, amplitude or Q of the oscillator to change. These changes are monitored with a peak height monitor, frequency counter, Q-meter, spectrum analyzer, or other measurement circuit. Elasticity of elastomers can be monitored in situ, using miniaturized sensors.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1990},
month = {1}
}

Patent:

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