The expression for exciting with a laser line source is derived through analyzing the principle of exciting surface ultrasonic waves by a laser point source.
通过对点光源激励声表面波的机理进行分析，推导出线光源激励的表达式。
A laser huge pulse irradiates on aluminium plates to cause ultrasonic waves. The waveform of the rear surface displacement produced by ultrasounds is detected with optical homodyne.
激光巨脉冲在金属铝块上产生超声波，由光学零差探测得到超声引起的后表面位移的波形。
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