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首页> 外文期刊>IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control >Remote laser generation of narrow-band surface waves through optical fibers
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Remote laser generation of narrow-band surface waves through optical fibers

机译：通过光纤远程产生窄带表面波的激光

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摘要

This paper demonstrates the use of a fiberoptic bundle for flexible, compact, remote, and noncontact laser generation of surface ultrasonic waves in materials. The bundle is able to deliver Nd:YAG pulsed light with a 60% delivery efficiency up to an average energy of 55 mJ/pulse for a pulse duration on the order of 10 ns and a pulse repetition rate of 20 Hz without signs of fiber damage. Details of the bundle construction and surface preparation are given, and pulsed light delivery tests performed with single tapered fibers are discussed. The high-power light delivery capabilities of the bundle are demonstrated for the generation of narrow-band surface waves in a Carbon/PEEK composite laminate by a spatial modulation technique that employs a periodic transmission mask. Single laser pulse ultrasonic tonebursts are clearly detectable using a small aperture piezoelectric transducer while ensuring thermoelastic generation conditions. The theory of narrow-band generation of surface acoustic waves is improved by accounting for the strength nonuniformity of the illumination sources. In addition, the effect of the number of illumination sources on the bandwidth of the generated surface wave is assessed experimentally, and excellent agreement is shown with the theoretical results predicted by the improved model.
机译：本文演示了使用光纤束在材料中的表面超声波产生柔性，紧凑，远程和非接触式激光的过程。该光束能够以60％的传输效率传输Nd：YAG脉冲光，平均能量高达55 mJ /脉冲，脉冲持续时间约为10 ns，脉冲重复频率为20 Hz，而不会损坏光纤。给出了束结构和表面处理的详细信息，并讨论了使用单根锥形纤维进行的脉冲光传输测试。通过采用周期性透射掩模的空间调制技术，证明了碳纳米管束的高功率光传输能力可在Carbon / PEEK复合材料层压板中产生窄带表面波。使用小孔径压电换能器可以清楚地检测到单个激光脉冲超声爆裂，同时确保热弹性产生条件。通过考虑照明源的强度不均匀性，改进了表面声波的窄带生成理论。此外，实验评估了照明源数量对产生的表面波带宽的影响，并且与改进模型预测的理论结果显示出极好的一致性。

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