16 August 2001 Steerable ultrasonic source using low-power laser sources and fiber optic delivery
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Low power laser diode sources were used in conjunction with electronically controllable time delays and fiber optic delivery arranges as a phased array to produce an electronically steerable ultrasonic source. Delays between the array elements of up to 520nS allowed steering of the fundamental longitudinal mode to be achieved at angles of up to 18 degree(s), whilst low pulse powers of 3.6(mu) J ensured that the testing mechanism was non-destructive. Beamsteering has been demonstrated for aluminium plates demonstrating great potential as a tool for structural assessment.
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Colin I. Swift, Colin I. Swift, S. Gareth Pierce, S. Gareth Pierce, Brian Culshaw, Brian Culshaw, } "Steerable ultrasonic source using low-power laser sources and fiber optic delivery", Proc. SPIE 4327, Smart Structures and Materials 2001: Smart Structures and Integrated Systems, (16 August 2001); doi: 10.1117/12.436575; https://doi.org/10.1117/12.436575

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