New symmetric reflector ultrasonic transducers (SRUT)

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
Minoru Toda

Abstract

This paper proposes a new structure composed of reflector plates mounted in front and in back of the transducer at an angle of 45 degrees, so that acoustic waves from front and back of the transducer are combined to form a single main beam. This principle is applicable to both transmitters and receivers. Because the propagation path lengths of the 2 beams are identical, they constructively add at all frequencies. Theoretical investigations revealed that far field directivity becomes sharper and acoustic pressure output is doubled. Experiments using an air ultrasonic transducer constructed of 50-kHz polyvinylidene fluoride corrugated film has shown doubled acoustic pressure in the far field, and the predicted sharper directivity has been observed. The reflector structure has been also applied to a 2.6-MHz lead zirconate titanate transducer in water with matching layers at both surfaces which has shown almost doubled bandwidth compared with an air backing structure, and doubled output power in continuous drive. Also pulse echo experiments have shown the effectiveness of this scheme.

References

Aug 1, 1983·IEEE Transactions on Bio-medical Engineering·J W HuntF S Foster
Jan 22, 2002·IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control·M Toda
Jan 8, 2008·The Journal of the Acoustical Society of America·Xiaozheng Zeng, Robert J McGough
Feb 2, 2008·IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control·F S FosterM D Sherar
Feb 5, 2008·IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control·I LadabaumB T Khuri-Yakub
Jan 1, 1992·IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control·A S Fiorillo

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