Studies on the Improvement of Resolution on the Ultrasonic Inspection Method

对提高超声检测方法的分辨率进行了研究。结果表明：1.在吸收特性较低的介质情况下，通过小波处理，不仅提高了分辨率，而且保留了反射波的极性和相位信息。利用CDP堆栈数据分析了介质中的速度分布。对于高吸收特性的介质，利用合成的任意深度的小波作为包含吸收特性的新的基小波，提高了分辨率。将CDP叠加、小波处理、偏移和合成声阻抗测井应用于人体模型数据，与传统的超声检测方法相比，分辨率有了很大的提高，物性的解释也有了很大的提高。通过使用沿任意直线方向的垂直剖面和垂直剖面与时间切片剖面相结合的显示，使得三维数据体的解释成为可能。

The research for the improvement of resolution on the ultrasonic inspection method was carried out. Consequently, the following results were obtained :1. In the case of media of low absorption characteristics, not only the resolution is greatly improved, but also the imformation of polarity and phase in reflected waves is preserved thorough the wavelet processing.2. The Velocity Distribution in Media is Analyzed by CDP Stack Data.3. In the case of media of high absorption characteristics, the resolution is improved by the wavelet processing using the synthesized wavelet at arbitrary depth as the new basic wavelet including the absorption characteristics.4. When CDP stack, wavelet processing, migration and synthetic, accoustic impedance log are applied to the data from a phantom model of human body, great improvement of resolution and the interpretation for physical properties become available compared with the conventional ultrasonic inspecti on method.5. By using the vertical section along the arbitrary line direction and the display which combines the vertical section with the time slice section, the interpretation of three dimensional data volume becomes feasible.