利用声线跟踪方法对超声检测探头所产生的时域波形信号进行分析时,难以定量化地得到波形信号的准确描述。针对这一问题,在应用声线跟踪方法时,将探头面上各点视为一个脉动球辐射源,通过声波叠加的方式,定量化计算出观测点的时变波形信号。对脉冲波激励下的探头暂态声场进行了计算与对比验证,结果表明: 在整个探头平面内,以小于声波波长尺寸的离散化区域去构造声线并进行相应的计算,可得到较为准确的结果;所提出的时域波形信号构建方法正确,将有助于推动声线跟踪方法在定量化信号分析方面的应用研究。

For quantification analysis of ultrasonic testing,it is difficult to obtain accurate waveforms by ray-tracing method. To solve this problem,a computing technique was put forward. Points on the face of ultrasonic probe were seen as spherical radiation sources,the time-varying waveforms at observation points could be quantified by superposition of sound waves from the sources. For an ultrasonic probe,transient sound field was calculated and analyzed,and the results were verified. The results show that: Accurate results can be obtained if the face of probe is entirely discretized and the discrete size is smaller than acoustic wavelength;the proposed technique to construct waveform signals by ray-tracing method is correct,and it will promote quantitative analysis for various ultrasonic testing models.