本项目的目的是研究改善金属中地下不连续的尺寸、形状和位置特征的方法。这是通过将计算机数据处理技术应用于传统超声脉冲回波系统中获得的信号来实现的。其主要优点是提高了信噪比和分辨率。 从不连续处接收的超声脉冲与参考函数相结合，以保持接收脉冲的相位和振幅。 对合成信号的功率谱进行处理。参考函数还用于补偿由材料微观结构引起的一些频率相关散射。在数据采集过程中，模拟信号平均可以提高信噪比（SNR）。数据采集后，数字反卷积程序可提高传感器的纵向分辨率。

The purpose of this project has been to investigate means for obtaining improved characterization of the size, shape, and location of subsurface discontinuities in metals. This has been done by applying computerized data processing techniques to the signal obtained in conventional ultrasonic pulse-echo systems. The principal benefits are improved signal-to-noise ratio, and resolution. The received ultrasonic pulse from a discontinuity is combined with a reference function in order to preserve both the phase and amplitude of the received pulse. Processing is performed on the power spectrum of the resultant signal. The reference function is also used to compensate for some of the frequency-dependent scattering caused by the material microstructure. During data acquisition, analog signal averaging improves the signal-to-noise ratio (SNR). After data acquisition, a digital deconvolution procedure improves the transducer longitudinal resolution.