The effective coupling coefficient for a completed PIN-PMN-PT array.
作者： D.N. Stephens , R. Wodnicki , R. Chen , L.-M. Liang , Q. Zhou
DOI: 10.1016/J.ULTRAS.2020.106258
关键词:
摘要: Abstract The computation of the electromechanical coupling coefficient (EMCC) a fully assembled medical ultrasound transducer array is directly computed with closed form expressions. Levenberg-Marquardt non-linear regression algorithm (LMA) employed to help confirm EMCC calculated prediction (kEFF) and provide statistical insights. complex electrical impedance spectra 1–3 composite two matching layers operating at 3.75 MHz center frequency using PIN-PMN-PT single crystal material measured in air both before after oven heating 160 °C for 15 min. produces changes −4.9%, clamped dielectric constant −11%, effective longitudinal velocity −2.5%. Utilizing pre- post-heating data, values from new expressions agree well complete KLM model based LMA, also exhibit approximately one tenth error as compared formulas flat, unloaded transducer.
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