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Control Electronics for a Tissue Sensing Piezoelectric Bimorph

机译:组织传感压电双压电晶片的控制电子设备

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摘要

Differentiation among distinct media that have similar mechanical characteristics using piezoelectric transducers is a technique based on the detection and evaluation of different electrical parameters.We developed a high sensitivity system using a piezoelectric bimorph.One of the layers is used for the resonant excitation of vibration and the other layer is used as a sensing element.Frequency shift and transfer function of the bimorph's voltages Usensor/UActuator are detected and evaluated at constant phase utilizing a Phase Lock Loop (PLL) implemented with a fuzzy logic algorithm.In order to get the highest sensitivity from our system,two approaches for the signal evaluation are presented.The first one is based on analogue electronics and the second approach consists on a complete digital solution using microcontrollers.We have conducted a series of measurements of gelatine gel phantoms at different concentrations.The bimorph sensor system is able to detect even minimal differences in gelatine gel phantoms.
机译:使用压电换能器区分具有相似机械特性的不同介质是一项基于检测和评估不同电参数的技术。我们开发了一种使用压电双压电晶片的高灵敏度系统,其中一层用于振动和振动的共振激发。使用模糊逻辑算法实现的锁相环(PLL)在恒定相位检测并评估双压电晶片电压Usensor / UActuator的频率偏移和传递函数,以获取最高信号。从系统的灵敏度出发,提出了两种信号评估方法。第一种方法基于模拟电子设备,第二种方法包括使用微控制器的完整数字解决方案。我们进行了一系列不同浓度的明胶凝胶体模的测量。双压电晶片传感器系统甚至能够检测到最小的差异明胶凝胶体模。

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