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The Characteristic of Giant Magnetostrictive Thin Film with Gas Sensitive Layer and Its Application

Author: ZhaoJianGuo
Tutor: WangFuJi
School: Dalian University of Technology
Course: Mechanical and Electronic Engineering
Keywords: Giant magnetostrictive film Gas-sensitive coating Feature Gas detection
CLC: TP212
Type: Master's thesis
Year: 2009
Downloads: 68
Quote: 0
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Abstract


The giant magnetostrictive film (GMF) as a novel functional materials, relying on its large magnetostriction coefficient, high magnetic drive coupling efficiency, fast response speed and other significant advantages, shows broad application in the field of micro-equipment manufacturing prospects for domestic and foreign scholars have gradually carry out the study of the giant magnetostrictive thin film micro-sensors. But its special gas-sensitive material combination, developed into the performance characteristics of the micro gas sensors has not yet been widely recognized. The paper by the new functional materials and gas sensing properties sensitive coating combination as the research object to study the static and dynamic characteristics under low magnetic field, and to explore the application to gas detection, the development of a quality micro gas sensor GMF static and dynamic magnetic machine coupling characteristics of its micro-sensor to provide some new ideas and methods. GMF magnetostrictive characteristics and the requirements of the driving magnetic field, using a combination of Helmholtz coils as an external drive magnetic field, select the laser micro-displacement sensor as a displacement amount detection unit, developed a set of gas-sensitive coating GMF static dynamic magnetic machine coupling characteristics of the experimental system. Finite element analysis and experimental verification, the magnetic field of the coil drive better axial uniformity and intensity. On this basis, combined with the nonlinear theory of elasticity, Izod gas-sensitive coating the GMF static magnetic the machine coupling model and the end of the cantilever displacement equation experimental results show that the proposed model can be used to predict thin film low magnetic field under the hysteresis loop, and having a gas-sensitive coating GMF exhibit better low hysteresis and sensitivity. For gas-sensitive coating the GMF dynamic vibration characteristics during the experiment, GMF showed the ultra-harmonic resonance of order n, and the first three super-harmonic resonance effect with the main resonance comparable. Good first-order the main resonance effect, the Izod GMF applied to the the ethanol gas micro-sensor design and development and to build ethanol gas sensitivity testing laboratory device. The experimental results show that: the micro-cantilever vibration response has better linearity and sensitivity characteristic in ethanol gas concentration within the range of 100 ~ 600ppm. In summary, this paper developed a gas-sensitive coating GMF, magnetic drive coupling characteristics of the experimental system developed showed good static and dynamic characteristics, application the cantilever structure design quality micro gas sensor better vibration response of ethanol gas concentration results GMF provide some reference value in the application of micro-sensors.

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CLC: > Industrial Technology > Automation technology,computer technology > Automation technology and equipment > Automation components,parts > Transmitter ( converter),the sensor
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