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Ultrasonic focusing and scanning with multiple waves

Chinese Physics B 2013年第1期22卷 312-317页

作者：张碧星刘冬冬师芳芳 Hefeng Dong State Key Laboratory of Acoustics Institute of Acoustics Chinese Academy of Sciences Department of Electronics and Telecommunications Norwegian University of Science and Technology

This paper presents a new focusing and scanning method which focuses multiple waves on a target. The key of the method is to control excitation pulses for each element of the transducer array. The excitation pulse on each array element is obtained by time reversing the signal received by the same element, which is generated by an imaginary source at the target. The excitation pulses from all array elements are transmitted and arrive at the target simultaneously, and focusing is achieved. The performance of the two methods is compared in numerical examples, and it is demonstrated that the proposed method achieves a satisfactory focusing and a good signal-to-noise ratio no matter where the target location is.

关键词： ultrasonic focusing and scanning multiple waves transducer array

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Focus projection of the parabolic radon transform and multiple waves separator, elimination

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Journal of Central South University of Technology 2002年第1期9卷 30-35页

作者：张建贵宋守根袁修贵 College of Resources Environmental and Civil Engineering Central South University Changsha China

Based on the scalar wave equation, making use of the ray approximation of the reflected seismic data (CMP or CSP gathers), the authors derive respectively the projection function of the primary waves and multiple waves at the near offset (CMP or CSP gathers) in the parabolic Radon transform(PRT)domain. From the geometric point, the authors prove that the energy of the reflection still distributes along hyperbola which has higher curvature in the PRT domain and becomes some energy masses. So the primary waves and the multiple waves which interweave each other in ( x, t ) domain can be completely separated, which helps the multiple waves eliminated by filtering or muting. It is important for the analysis of velocity and the separator and elimination of multiple waves.

关键词： parabolic Radon transform multiple waves projection focus

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