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Ultrasonic field and temperature sensor based on short in-fibre Bragg gratings

Ultrasonic field and temperature sensor based on short in-fibre Bragg gratings

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The authors demonstrate that in-fibre Bragg gratings may be successfully used to measure megahertz acoustic fields if the grating length is sufficiently short and the optical fibre is appropriately desensitised. A noise-limited pressure resolution of 4.5 × 10–3 atm/√Hz was found. The capability to simultaneously act as a temperature sensor is also demonstrated.

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