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Project Sponsor: NSF CMS-0528681 Project Description: Optical fiber sensors have been widely exploited for
displacement measurement, temperature sensing, medical diagnosis, and
confocal microscopy, due to their compact size, light weight, remote
operation, capability to operate in harsh environment, and immunity to
electro-magnetic interference. Among different measurement schemes, distance
measurement is one of the most common and widely applied techniques that
often serve as the basis for the sensing of other physical parameters such as
pressure, strain, vibration, and acceleration. Optical fiber whitelight
interferometers for distance measurement have attracted a lot of attentions
recently because they offer ultrahigh accuracy, large dynamic range, and
robustness. We are developing an in-fiber whitelight Michelson interferometer
using long period fiber grating for absolute distance measurement. The
advantages of the proposed distance sensor include ultra-precise absolute
distance measurement, large dynamic range, simultaneous distance and
temperature measurement, and self-calibrated high-speed data interrogation.
Development of an efficient signal processing technique for data processing
is underway. Initial simulation results demonstrate that the signal
processing algorithm is able to converge to the absolute distances with
sub-nanometer accuracy over a large range. We are interested in applying this
novel distance sensor for near-field surface profiling of nanoscale
structures and mechanical testing of MEMS thin film materials. In addition,
it could have broad applications for damage detection of composite materials,
real-time monitoring of manufacturing processes, and in-situ measurement of
crack-tip plasticity. Publications: Huang,
H., Majumdar, A., Cho, J., "Fabrication and evaluation of hybrid
silica/polymer optical fiber sensors for large strain measurement",
accepted to Trans. Inst. measurement and Control, Intelligent Fault Diagnosis
& Prognosis for Engineering Systems Special issue Majumdar, A. & Huang, H.,
2008, “Development of an in-fiber whitelight interferometric distance sensor
for absolute measurement of arbitrary small distances”, Applied Optics,
v47, n15, p2821-2828 PDF Huang, H. & Majumdar, A.,
"Fabrication and evaluation of a LPFG-based whitelight interferometric
distance sensor", SPIE-Sensors and Smart Structures Technologies for
Civil, Mechanical, and Aerospace Systems, Huang, H., “Fabrication and
evaluation of hybrid silica/polymer optical fiber sensors for large strain
measurement”, SPIE-Smart Structures and Materials and NDE for Health
Monitoring and Diagnostics, San Diego, CA, March, 2007 Huang, H., "Data
interrogation for Fabry-Perot whitelight interferometry", SPIE-Sensors
and Smart Structures Technologies for Civil, Mechanical, and Aerospace
Systems, |
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With
gratitude and recognition to our fine sponsors:
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500 W.
First Street, Arlington, TX 76019, Tel: 817-272-0563, Fax: 817-272-5010, Email: huang@uta.edu
Copyright
@2006-2008, University of Texas at Arlington. All rights reserved. Last Updated
08/18/2008.