Abstract
In this work we present the development and characterization of highly-sensitive fibre optic coils hydrophone for the detection of ultrasonic signals. In particular, fibre coils are a good improvement, in front of electronic sensors, for the application proposed in this work, the detection of ultrasonic signals within power transformers. Several fibre optic coils are tested in a laboratory controlled environment within a suitable ultrasonic frequency range, typically associated to ultrasonic emission in power transformers. We develop and characterize several fibre optic hydrophone coils using a Mach-Zehnder interferometer. A detailed study is carried out on the ideal shape of the hydrophone fibre probe, for parameters such as sensitivity and frequency range. Also, a comparative analysis has been carried out on the sensitivity of commercial PZT to the sensitivity of the fibre optic system under the same test conditions.
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