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Resonance Analysis of High Temperature Piezoelectric Materials for Actuation and Sensing

机译：致动和传感的高温压电材料的共振分析

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The current NASA Decadal mission planning effort has identified Venus as a significant scientific target for a surface in-situ sampling mission. The Venus environment represents several extremes including high temperature (460℃), high pressure (～ 9 MPa.), and potentially corrosive (condensed sulfuric acid droplets that adhere to surfaces during entry) environments. This technology challenge requires new actuator and sensor designs that can withstand these extreme conditions. In addition a variety of industrial applications could benefit from an extended operating temperature range of actuators and sensors. Piezoelectric materials can potentially operate over a wide temperature range reaching as low as -270℃ to as high as +650℃. Single crystals, like LiNbO_3, have a Curie temperature that is higher than +1000℃. In order to investigate the feasibility of producing actuators/sensors that can operate under these conditions we have initiated a study of the properties of a variety of piezoelectric materials in the temperature range 25℃ to 500℃. These piezoelectric materials were chosen because they are solid state and can be designed as actuators to provide high torque, stroke, and speed. However the feasibility of this critical actuation capability has never been demonstrated under the extreme conditions mentioned above. We will present the results of our measurements on a variety of piezoelectric materials that can be operated at temperatures above 460℃. The data for small signal resonance analysis (ring, radial and thickness extensional modes) of disk and ring samples made of BST-PT and BMT-PT (TRS Technologies Inc.) and Bismuth Titanate BT (Ferroperm Piezoceramics A/S, Sinoceramics) as a function of the temperature will be presented.
机译：目前的NASA十年任务计划工作已将金星确定为地面原位采样任务的重要科学目标。金星环境代表了几种极端情况，包括高温（460℃），高压（〜9 MPa。）和潜在的腐蚀性（进入过程中粘附在表面的冷凝硫酸液滴）环境。这项技术挑战要求新的执行器和传感器设计能够承受这些极端条件。此外，执行器和传感器的扩展工作温度范围可从多种工业应用中受益。压电材料可以在很低的-270℃到+ 650℃的宽温度范围内工作。 LiNbO_3等单晶的居里温度高于+ 1000℃。为了研究生产可在这些条件下运行的执行器/传感器的可行性，我们已开始研究各种压电材料在25℃至500℃温度范围内的性能。选择这些压电材料是因为它们是固态的，可以设计为致动器以提供高扭矩，冲程和速度。然而，从未在上述极端条件下证明过这种关键致动能力的可行性。我们将介绍可在460℃以上温度下运行的各种压电材料的测量结果。由BST-PT和BMT-PT（TRS Technologies Inc.）和钛酸铋BT（Ferroperm Piezoceramics A / S，Sinoceramics）制成的磁盘和环形样品的小信号共振分析（环形，径向和厚度扩展模式）的数据为将显示温度的函数。

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