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Title: Mointoring Thickness Deviations in Planar Multi-Layered Elastic Structures Using Impedance Signatures

Abstract

In this letter, a low frequency ultrasonic resonance technique that operates in the (20 - 80 kHz) regime is presented that demonstrates detection of thickness changes on the order of +/- 10{micro}m. This measurement capability is a result of the direct correlation between the electrical impedance of an electro-acoustic transducer and the mechanical loading it experiences when placed in contact with a layered elastic structure. The relative frequency shifts of the resonances peaks can be estimated through a simple one-dimensional transmission model. Separate experimental measurements confirm this technique to be sensitive to subtle changes in the underlying layered elastic structure.

Authors:
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
914620
Report Number(s):
UCRL-TR-229538
TRN: US200812%%200
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION; DETECTION; IMPEDANCE; MONITORING; RESONANCE; THICKNESS; TRANSDUCERS; ULTRASONIC WAVES

Citation Formats

Fisher, K A. Mointoring Thickness Deviations in Planar Multi-Layered Elastic Structures Using Impedance Signatures. United States: N. p., 2007. Web. doi:10.2172/914620.
Fisher, K A. Mointoring Thickness Deviations in Planar Multi-Layered Elastic Structures Using Impedance Signatures. United States. doi:10.2172/914620.
Fisher, K A. Fri . "Mointoring Thickness Deviations in Planar Multi-Layered Elastic Structures Using Impedance Signatures". United States. doi:10.2172/914620. https://www.osti.gov/servlets/purl/914620.
@article{osti_914620,
title = {Mointoring Thickness Deviations in Planar Multi-Layered Elastic Structures Using Impedance Signatures},
author = {Fisher, K A},
abstractNote = {In this letter, a low frequency ultrasonic resonance technique that operates in the (20 - 80 kHz) regime is presented that demonstrates detection of thickness changes on the order of +/- 10{micro}m. This measurement capability is a result of the direct correlation between the electrical impedance of an electro-acoustic transducer and the mechanical loading it experiences when placed in contact with a layered elastic structure. The relative frequency shifts of the resonances peaks can be estimated through a simple one-dimensional transmission model. Separate experimental measurements confirm this technique to be sensitive to subtle changes in the underlying layered elastic structure.},
doi = {10.2172/914620},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Fri Jan 26 00:00:00 EST 2007},
month = {Fri Jan 26 00:00:00 EST 2007}
}

Technical Report:

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