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All-fibre SAW sensor with frequency tuning capability

All-fibre SAW sensor with frequency tuning capability

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A new sensor for detecting surface acoustic waves (SAWs) is presented. The system uses single-mode optical fibres throughout, and requires only one 3 dB directional coupler. The sensor is tunable to acoustic frequencies above 8 MHz. The new system can be realised in a particularly compact form, and could form the basis of a miniature instrument.

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