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quarter wavelength Acoustical Matching Layers Design for Ultrasonic Piezoelectric Transducer

Quarter Wavelength Acoustical Matching Layers Design for Ult...

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第二届全国压电和声波理论及器件技术研讨会

作者： Yeong-Chin Chen Wei-Kuo Liu Menq-Jion Wu Department of Electronics Engineering and Computer Science Tung-Fang Institute of TechnologyTaiwanR.O.C. Department of Mechatronics National Changhua University of EducationTaiwanR.O.C.

Ultrasound imaging has become an effective and practical tool for obtaining information from within the human body as well as because it provides a clear real-time display of body tissue without exposing the patient to *** obtain a good quality of ultrasound imaging,ultrasonic piezoelectric transducers with high sensitivity,good impulse response,high-efficiency,low-ripple,and wide-band performance is desired. The approach we have used consists of impedance matching the front face of the piezoelectric transducer to the propagating medium with a quarter wavelength impedance matching layer and inserting an un-matching quarter wavelength acoustical layer between the rear face and backing *** the backing at the rear surface,a soft backing demonstrating a better impedance matching result which can improve the bandwidth,but exhibiting a longer duration impulse response should be used.A un-matched heavy backing would degrade the wide-band phenomena,but show a shorter time duration(<0.5μS) for image application. The PSPICE(Personal Simulation Program with Integrated Circuit Emphasis) code of the Mason model is developed to precisely predict the performance of the matched transducers and helps to achieve a compromise between the wide-bandwidth and short time duration characteristics of a two-matching-layer unmatched *** optimum impedance of the matching plate can be estimated to obtain the specific bandwidth and maximum response for special applications such as transmitting or imaging *** agreement between the simulation results and experimental results has been achieved.

关键词： Ultrasonic diagnostic quarter wavelength Acoustical matching layer Piezoelectric transducer Wide-band Time duration Mason model PSPICE

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