Laser generation as a standard acoustic source in metals
Laser generation as a standard acoustic source in metals
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DOI：
10.1063/1.92476
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发表时间：
1981-05
影响因子：
4
通讯作者：
D. Hutchins;R. Dewhurst;S. Palmer;C. Scruby
中科院分区：
文献类型：
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作者：
D. Hutchins;R. Dewhurst;S. Palmer;C. Scruby
用宽带电容传感器在震中检测了由激光照射铝和低碳钢样品产生的绝对声波波形。利用板内波传播理论并假设某些源特性，与理论波形进行了比较。结果表明，激光产生能够产生三种类型的标准声源，即水平力偶极子和法向力偶极子，每一种都具有阶跃函数时间依赖性，以及法向力偶极子具有δ函数时间依赖性。潜在的生成机制进行了讨论。
Absolute acoustic waveforms, generated by laser irradiation of aluminium and mild steel samples, have been detected at epicenter with a wide‐band capacitance transducer. Comparison has been made with theoretical waveforms, utilizing theory for wave propagation within a plate and assuming certain source characteristics. Results have shown that laser generation is able to produce three types of standard acoustic source, namely a horizontal force dipole and a normal force monopole, each with step‐function time dependence, and a normal force monopole with δ‐function time dependence. Underlying generation mechanisms are discussed.