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Reverse Time Migration: A Seismic Imaging Technique Applied to Ultrasound Data

机译:反向时间迁移:应用于超声数据的地震成像技术

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New fast and efficient multi-channel ultrasound echo measurement systems are currently introduced for practical applications in NDT-CE [1]. The acquired multi-offset data are currently processed and imaged by the synthetic aperture focussing technique (SAFT, see e.g. [2]). The application of SAFT, which is closely related to the seismic Kirchhoff migration method, is successful in many cases, but has certain limitations. For example vertical or steeply dipping interfaces as well as lower parts of a tendon duct are normally not visible in SAFT images (Figure 5). Recent developments of the SAFT technique as phase evaluation have resulted in improved imaging results and reflector characterisation possibilities [3] but the basic limitations still exist.
机译:目前在NDT-CE中的实际应用中引入了新的快速高效的多通道超声回声测量系统[1]。当前通过合成孔径聚焦技术(SAFT,参见例如SAFT,获取的多偏移数据。[2])。 SAFT的应用与地震Kirchhoff迁移方法密切相关,在许多情况下是成功的,但具有一定的局限性。例如,垂直或陡峭的浸渍界面以及肌腱管道的下部通常在SAFT图像中不可见(图5)。作为相位评估的近期SAFT技术的发展导致了改善的成像结果和反射器表征可能性[3]但仍存在基本限制。

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