| Summary: | 碩士 === 國立中正大學 === 地震研究所暨應用地球物理研究所 === 97 === Compare to single element traditional ultrasonic probe, The phased array source which has several elements is widely used in medical images and nondestructive testing (NDT), Because of its excellent controllable, so we can transmit any direction wavefront by time shift. The synthetic aperture focusing technique (SAFT)is use in traditional ultrasonic probe, and total focusing method (TFM)is use in phased array probe. Both of synthetic aperture focusing technique and total focusing method are a way to improve acoustic image.
In nondestructive testing, we usually need to face the problem of refraction. So in this paper we will combine TFM and refraction correction in order to improve acoustic image.
Finally, using the phased array probe with transmitting time shift, TFM and refraction correction can built the high resolution 3D image volume.
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