Embeddable Sensors Based on Novel Microwave Gratings
Sensor requirements for SHM under various conditions
Coaxial cable Bragg grating (CCBG)
CCBG: drilling holes into a coaxial cable at a
periodic distance (6.4cm.cm) along the cable
Bragg resonance observed at the fundamental80
frequency of 1.56GHz in reflection and
Repeating occurrences at multiples of the
fundamental frequency (high order modes)
Resonance frequency shifted as a function of
temperature and strain
Parameters of interests
Temperature, pressure, strain, vibrations, etc.
Survive and operate at high temperatures
Withstand high pressure
Large dynamic range
High temperature capability due to a wide range of available materials
Robust and large dynamic range
Various design possibilities to achieve high resolution
Inexpensive: excited, probed and processed in electrical form
Embeddable and remote interrogation
Develop a new embeddable sensor platform using microwave gratings
1) Understand physics of sensors via simulation
2) Design and fabricate robust and high-temperature tolerant sensors
3) Demonstrate new sensors for structure health monitoring (SHM)
Faculty Advisor: Dr. Hai Xiao, Electrical Engineering
Normalized Freq shift (MHz)
Student: Ken Smith, Electrical and Computer Engineering
Linear fit of left
Linear fit of righ
Resonance spectra of a CCBG made on a RG-58/U
coaxial cable with = 6.4cm.cm.
1.8 2.4 3.0
Axial strain ()
New ceramic waveguide high temperature sensors
Modeling and simulation based design of new high temperature tolerant sensors
using ceramic microwave structures (e.g., hollow ceramic waveguide)
Fabrication of microwave Bragg gratings using ceramic waveguides
Development of sensor interrogation algorithms
Evaluate sensor and system performance
Embed sensors into structures and demonstrate the capabilities
Microwave Bragg Grating
Periodic impedance changes in a waveguide
An electromagnetic (EM) wave is partially
reflected at the impedance discontinuities
Superposition of in-phase reflections
generates resonance in the reflection and
Resonance wavelength is determined by the
Microwave Bragg grating: a novel concept with great
potentials for various sensing applications
Robust and embeddable ceramic waveguide sensors
for structural health monitoring in high-temperature
 T. Wei, S. Wu, J. Huang, H.
Xiao, J. Fan, Coaxial Cable
Bragg Grating, Applied Physics
Letter, v.99, pp. 113517, 2011.
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