TY - CONF
T1 - Avoiding signal distortion in several classes of dynamic fiber-optic interrogators
AU - Datta Bhatta, Hari
AU - Davidi, Roy
AU - Tur, Moshe
N1 - Publisher Copyright:
© 2018 NDT.net. All rights reserved.
PY - 2018
Y1 - 2018
N2 - Dynamic fiber-optic interrogators, which employ frequency scanning to determine measurand-induced frequency shifts (as in fiber Bragg Gratings (FBGs) and Brillouin-based interrogations), normally report their measurement results on a uniform time grid. In reality, these instruments find their reported frequency shifts on a non-uniform time grid. The resulting errors, mainly harmonic distortion and nonlinear response, are shown to increase to severe levels as the sampling rate approaches the Nyquist criterion and as the employed frequency-scanning span comes close to the measurand dynamic range. Guidelines are provided how to estimate these errors and how to choose an operating point that minimizes these distortions.
AB - Dynamic fiber-optic interrogators, which employ frequency scanning to determine measurand-induced frequency shifts (as in fiber Bragg Gratings (FBGs) and Brillouin-based interrogations), normally report their measurement results on a uniform time grid. In reality, these instruments find their reported frequency shifts on a non-uniform time grid. The resulting errors, mainly harmonic distortion and nonlinear response, are shown to increase to severe levels as the sampling rate approaches the Nyquist criterion and as the employed frequency-scanning span comes close to the measurand dynamic range. Guidelines are provided how to estimate these errors and how to choose an operating point that minimizes these distortions.
UR - http://www.scopus.com/inward/record.url?scp=85070887316&partnerID=8YFLogxK
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AN - SCOPUS:85070887316
T2 - 9th European Workshop on Structural Health Monitoring, EWSHM 2018
Y2 - 10 July 2018 through 13 July 2018
ER -