TY - GEN
T1 - Fiber Bragg gratings and two wave mixing spectral demodulator system for impact detection and localization
AU - Kirikera, G.
AU - Balogun, O.
AU - Krishnaswamy, S.
PY - 2008
Y1 - 2008
N2 - Multiplexed fiber Bragg grating (FBG) sensors capable of dynamically measuring high frequency (>200KHz) ultrasonic waves using a two wave mixing spectral demodulator has been reported by us previously. The two-wave mixing spectral demodulator enables multiplexing of several FBG sensors and also acts as a high pass filter eliminating low frequency thermal drift and vibrational noise without the need for stabilization as required by other interferometric demodulation schemes. We have demonstrated that this system is capable of monitoring and locating of impact events if several FBG sensors are used. In this paper, we present recent results that have extended our original architecture to take into account the directional dependence of FBG sensor sensitivity to propagating ultrasonic waves. Since the FBG is highly directionally dependent at high frequencies, a simple rosette FBG pattern is implemented enabling effective detection of impact from any location.
AB - Multiplexed fiber Bragg grating (FBG) sensors capable of dynamically measuring high frequency (>200KHz) ultrasonic waves using a two wave mixing spectral demodulator has been reported by us previously. The two-wave mixing spectral demodulator enables multiplexing of several FBG sensors and also acts as a high pass filter eliminating low frequency thermal drift and vibrational noise without the need for stabilization as required by other interferometric demodulation schemes. We have demonstrated that this system is capable of monitoring and locating of impact events if several FBG sensors are used. In this paper, we present recent results that have extended our original architecture to take into account the directional dependence of FBG sensor sensitivity to propagating ultrasonic waves. Since the FBG is highly directionally dependent at high frequencies, a simple rosette FBG pattern is implemented enabling effective detection of impact from any location.
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M3 - Conference contribution
AN - SCOPUS:62949241313
SN - 9781932078947
T3 - Proceedings of the 4th European Workshop on Structural Health Monitoring
SP - 840
EP - 846
BT - Proceedings of the 4th European Workshop on Structural Health Monitoring
T2 - 4th European Workshop on Structural Health Monitoring
Y2 - 2 July 2008 through 4 July 2008
ER -