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Scanning high-power continuous wave laser-generated bulk acoustic waves.

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    High-power laser scanning on aluminum generates ultrasonic waves through thermal gradients. Optimized scanning speed controls wave direction and amplitude for enhanced signal detection.

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    Area of Science:

    • Materials Science
    • Acoustics
    • Non-Destructive Testing

    Background:

    • Laser-ultrasound generation is a key technique in materials characterization.
    • Understanding the relationship between laser parameters and ultrasonic wave generation is crucial for effective non-destructive testing.
    • Previous studies have explored laser-generated ultrasound, but precise control over wave directionality remains an area of active research.

    Purpose of the Study:

    • To theoretically investigate the generation of ultrasonic bulk waves using a high-power continuous laser scanning on aluminum.
    • To analyze the influence of laser scanning speed on the generation, propagation direction, and amplitude of ultrasonic waves.
    • To demonstrate a method for controlling the directionality of ultrasonic signals through numerical simulation.

    Main Methods:

    • Theoretical investigation of ultrasonic bulk wave generation.
    • Analysis of thermal gradients induced by laser scanning.
    • Numerical simulation of wave propagation and interaction with material properties.
    • Parametric study of laser scanning speed effects on ultrasonic wave characteristics.

    Main Results:

    • Measurable ultrasonic waves are generated due to large temperature gradients, despite minimal overall temperature rise.
    • Specific scanning speed ranges are required for the generation of both longitudinal and transverse ultrasonic waves.
    • Significant enhancement of wavefront amplitude occurs when the scanning-speed-controlled wavefront angle aligns with the ultrasound propagation direction.

    Conclusions:

    • Laser scanning on aluminum surfaces can effectively generate ultrasonic bulk waves.
    • Scanning speed is a critical parameter for controlling the directionality and amplitude of generated ultrasonic waves.
    • This study presents a numerically simulated method for achieving direction-controlled ultrasonic signals by meeting specific scanning speed requirements.