Control Electronics for a Tissue Sensing Piezoelectric Bimorph
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 bimorphs 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.
Piezo ceramics bimorph tactile sensor tissue characterization fuzzy control
D.Oliva Uribe Ralf Stroop T.Hemsel
Institute for Dynamics and Vibrations,University of Hannover,30167 Hannover,GERMANY University Hospital Marburg,Department of Neurosurgery,35043 Marburg GERMANY Heinz Nixdorf Institute,University of Paderbom,33102 Paderborn,GERMANY
国际会议
南京
英文
96-100
2007-09-09（万方平台首次上网日期，不代表论文的发表时间）