Wireless Strain Gauge System in a Multipath Environment

Wireless Strain Gauge System in a Multipath Environment

Bibliographic Details
Main Author: Tuncay, Orbay
Language:English
Published: The Ohio State University / OhioLINK 2008
Subjects:
Electrical Engineering
Engineering
Experiments
wireless strain sensor
surface acoustic wave (SAW)
jet engine
multipath
RFID
strain gauge
wireless strain measurement
SAW fabrication
Lithium Niobate
Online Access:http://rave.ohiolink.edu/etdc/view?acc_num=osu1222089977
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spelling ndltd-OhioLink-oai-etd.ohiolink.edu-osu12220899772021-08-03T05:54:35Z Wireless Strain Gauge System in a Multipath Environment Tuncay, Orbay Electrical Engineering Engineering Experiments wireless strain sensor surface acoustic wave (SAW) jet engine multipath RFID strain gauge wireless strain measurement SAW fabrication Lithium Niobate <p>A wireless strain sensing system utilizing passive, wireless, physically small and light weight sensors is desirable for measuring strain in harsh environments such as jet engine compressor and turbine blades. A cluttered and time varying environment results in high loss, blockage, multipath and modulation of the electromagnetic wave. Also, temperature changes affect the sensitivity of the strain measurement. Isolating the information signal from the reverberations in the environment requires time delays in the order of 100s of ns for jet engine environment. Therefore, a wireless strain gauge system that utilizes surface acoustic wave (SAW) strain sensors was studied and tested.</p><p>SAW strain sensors are designed to operate at 2.45GHz. Electron beam lithography is used to achieve minimum required feature size at this frequency. The fabrication process is outlined and scanning electron microscope images of some results are given.</p><p>A transceiver circuit is designed and constructed. The circuit is tested in free space, in the presence of signal blockage and a time varying channel. Measurements are shown to be in good agreement with predicted data. Sources of errors in the setup are identified to be leakage from transceiver circuit switches and bounce waveforms from the transceiver antenna.</p><p>A General Electric J85 jet engine compressor section is analyzed for signal propagation characteristics. Minimum frequency that can propagate through the compressor section is determined to be 5.2GHz. Measurements are done to show that circumferential polarization propagates stronger than radial inside the compressor section. An analytical approximation for the compressor section is generated by modeling compressor section blades as rectangular waveguides. Good agreement on cutoff frequency is achieved for circumferential polarization with the analytical predictions and measurement.</p><p>SAW temperature and strain sensors are measured in comparison to traditional gauges. This concept can be generalized to measuring many different physical quantities wirelessly without disturbing the operation of the equipment.</p> 2008-10-01 English text The Ohio State University / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=osu1222089977 http://rave.ohiolink.edu/etdc/view?acc_num=osu1222089977 unrestricted This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws.
collection NDLTD
language English
sources NDLTD
topic Electrical Engineering
Engineering
Experiments
wireless strain sensor
surface acoustic wave (SAW)
jet engine
multipath
RFID
strain gauge
wireless strain measurement
SAW fabrication
Lithium Niobate
spellingShingle Electrical Engineering
Engineering
Experiments
wireless strain sensor
surface acoustic wave (SAW)
jet engine
multipath
RFID
strain gauge
wireless strain measurement
SAW fabrication
Lithium Niobate
Tuncay, Orbay
Wireless Strain Gauge System in a Multipath Environment
author Tuncay, Orbay
author_facet Tuncay, Orbay
author_sort Tuncay, Orbay
title Wireless Strain Gauge System in a Multipath Environment
title_short Wireless Strain Gauge System in a Multipath Environment
title_full Wireless Strain Gauge System in a Multipath Environment
title_fullStr Wireless Strain Gauge System in a Multipath Environment
title_full_unstemmed Wireless Strain Gauge System in a Multipath Environment
title_sort wireless strain gauge system in a multipath environment
publisher The Ohio State University / OhioLINK
publishDate 2008
url http://rave.ohiolink.edu/etdc/view?acc_num=osu1222089977
work_keys_str_mv AT tuncayorbay wirelessstraingaugesysteminamultipathenvironment
_version_ 1719427580367470592

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