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Passive signal processing of in-line fiber etalon sensors for high strain-rate loading

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3 Author(s)
Yun-Lung Lo ; Dept. of Mech. Eng., Nat. Cheng Kung Univ., Tainan, Taiwan ; Sirkis, J.S. ; Chia-Chen Chang

This paper describes the development of a passively demodulated optical fiber sensor system capable of accommodating the high strain-rate events commonly encountered in applications involving stress wave propagation. This sensor system, which is based on in-line fiber etalon (ILFE) sensors and path-matched differential interferometry (PMDI), was tested experimentally at low frequency and strain-rates (time derivative of strain) up to (~107 με/s). For the present system, this strain-rate corresponds to a sensor phase bandwidth of approximately 100 kHz. Characterization tests using sensor gauge lengths ranging from 260 to 350 μm showed that the sensor system had a minimum detectable phase of ~2 microrad/√HZ rms at 2 kHz which corresponds to ~0.8 nε/√Hz rms for 260 μm-gauge length sensor

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Lightwave Technology, Journal of  (Volume:15 ,  Issue: 8 )