Ultrasonic focusing and scanning with multiple waves |
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Authors: | Zhang Bi-Xing Liu Dong-Dong Shi Fang-Fang Hefeng Dong |
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Affiliation: | a State Key Laboratory of Acoustics, Institute of Acoustics, Chinese Academy of Sciences, Beijing 100190, China;b Department of Electronics and Telecommunications, Norwegian University of Science and Technology, NO-7491, Trondheim, Norway |
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Abstract: | 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. |
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Keywords: | ultrasonic focusing and scanning multiple waves transducer array |
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