The characterization and quantification of High Intensity Therapeutic Ultrasound (HITU) fields is a difficult challenge, as appropriate sensors need to withstand very high local intensities in small focal regions and to measure them with a high reliability. Due to their high robustness and their small dimensions, fiber‐optic probes have proven to be a promising approach for this purpose. In this paper, a fiber‐optic displacement sensor and an interferometric optical set‐up are presented and the potential as well as the limitations of this set‐up are discussed.

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