On the actual bandwidth of some dynamic fiber optic strain/temperature interrogators

Rotem R. Preizler; R. Davidi; Avi Motil; Yakov Botsev; Meir Hahami; Moshe Tur

doi:10.1117/12.2267504

23 April 2017 On the actual bandwidth of some dynamic fiber optic strain/temperature interrogators

Rotem R. Preizler, R. Davidi, Avi Motil, Yakov Botsev, Meir Hahami, Moshe Tur

Proceedings Volume 10323, 25th International Conference on Optical Fiber Sensors; 103235C (2017) https://doi.org/10.1117/12.2267504
Event: 25th International Conference on Optical Fiber Sensors, 2017, Jeju, Korea, Republic of

Abstract

The measurement accuracy of dynamic fiber-optic sensing interrogators, which use frequency scanning to determine the value of the measured, err as either the event bandwidth approaches half the instrument sampling frequency or when the event dynamic range comes close to the instrument designed value. One main source of error is the common practice of assigning sampling at a non-uniform grid to a uniform one. Harmonics higher than -20 dB are observed for signal frequencies exceeding 25% of the sampling rate and/or for signal amplitudes higher than 15% of the instrument dynamic range. These findings have applications to fiber-Bragg-grating and Brillouin interrogators.

Citation Download Citation

Rotem R. Preizler, R. Davidi, Avi Motil, Yakov Botsev, Meir Hahami, and Moshe Tur "On the actual bandwidth of some dynamic fiber optic strain/temperature interrogators", Proc. SPIE 10323, 25th International Conference on Optical Fiber Sensors, 103235C (23 April 2017); https://doi.org/10.1117/12.2267504

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