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Magnetoelastic sensors and sensing systems: Sensor characterization and instrumentation.

机译：磁弹性传感器和感测系统：传感器特性和仪器。

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摘要

This dissertation is concerned with magnetoelastic sensors and sensing systems, primarily focusing on sensor characterization and instrumentation.; The sensor behavior and sensing mechanism are examined by modeling the sensor as a longitudinally vibrating rectangular beam, the longitudinal vibration of which is described by the equation of motion. The resonance frequency of a magnetoelastic sensor is determined by the sensor's length, mass density, and elasticity. From the perspective of signals and systems, the sensor is modeled as a mass-spring-friction second order system. The system response to an applied excitation consists of a steady-state response due to the applied excitation and a transient response due to the system's initial conditions. Analysis of both responses can be used for system characterization. A time-windowed periodic excitation is discussed in detail because it provides an efficient means of steady-state response analysis as well as transient response analysis.; The idea of threshold-crossing counting has been electronically implemented by developing a microcontroller-based instrument.; The microcontroller-based device has been fabricated, tested, and applied to laboratory experiments including pH monitoring and E. coli detection. The circuit was first prototyped on a breadboard and then on a printed circuit board (PCB). After preliminary results were obtained with breadboard prototyping and PCB board prototyping, the circuit was packaged into a plastic box containing a multifunctional coil. (Abstract shortened by UMI.)
机译：本文主要涉及磁弹性传感器和传感系统，主要集中在传感器的表征和仪器方面。通过将传感器建模为纵向振动的矩形梁来检查传感器的行为和传感机制，该矩形梁的纵向振动由运动方程式描述。磁弹性传感器的共振频率取决于传感器的长度，质量密度和弹性。从信号和系统的角度来看，传感器被建模为质量-弹簧-摩擦二阶系统。系统对施加的激励的响应包括由于施加的激励引起的稳态响应和由于系统的初始条件引起的瞬态响应。两种响应的分析均可用于系统表征。时间窗周期性激励被详细讨论，因为它提供了稳态响应分析和瞬态响应分析的有效方法。通过开发基于微控制器的仪器以电子方式实现了阈值交叉计数的想法。基于微控制器的设备已被制造，测试并应用于包括pH监测和大肠杆菌检测在内的实验室实验。该电路首先在面包板上制作原型，然后在印刷电路板上（PCB）制作原型。在通过面包板原型和PCB板原型获得初步结果后，将电路包装到一个装有多功能线圈的塑料盒中。 （摘要由UMI缩短。）

著录项

  • 作者

    Zeng, Kefeng.;

  • 作者单位

    The Pennsylvania State University.;

  • 授予单位 The Pennsylvania State University.;
  • 学科 Engineering Electronics and Electrical.
  • 学位 Ph.D.
  • 年度 2004
  • 页码 225 p.
  • 总页数 225
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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