Characterization of fast acoustic wave propagation using OFDR with double interrogation and frequency tracking

Haniel Gabai; Avishay Eyal

doi:10.1117/12.2059601

2 June 2014 Characterization of fast acoustic wave propagation using OFDR with double interrogation and frequency tracking

Haniel Gabai, Avishay Eyal

Author Affiliations +

Proceedings Volume 9157, 23rd International Conference on Optical Fibre Sensors; 91576R (2014) https://doi.org/10.1117/12.2059601
Event: OFS2014 23rd International Conference on Optical Fiber Sensors, 2014, Santander, Spain

Abstract

A highly sensitive OFDR system capable of detecting and tracking fast acoustic wave propagation is described. The system was tested by dropping a screw (50gr) and a paperclip (<5gr) at one end of an 18m PVC pipe. The sensing fiber detected the wave propagation (v ≈ 1750m/s) along the entire pipe. Fast phase variations due to the impact of the screw led to a transient shift in the frequency of the interrogating light which corrupted the observed response. By tracking the beat frequencies of predefined reflectors and extracting their amplitudes significant improvement in the system's output was obtained.

Citation Download Citation

Haniel Gabai and Avishay Eyal "Characterization of fast acoustic wave propagation using OFDR with double interrogation and frequency tracking", Proc. SPIE 9157, 23rd International Conference on Optical Fibre Sensors, 91576R (2 June 2014); https://doi.org/10.1117/12.2059601

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