A Wireless Surface-Acoustic-Wave-Based Torque Sensor for Rotating Shaft Applications

• Main Authors: Po-yang Su, 蘇柏仰
• Other Authors: J. S. Chen
• Format: Others
• Language: zh-TW
• Published: 2006
• Online Access: http://ndltd.ncl.edu.tw/handle/63497774290416580990

碩士 === 國立中正大學 === 機械工程所 === 94 === With technological progress, most future products will focus on portable format. A little small one port (not two port), Surface Acoustic Wave Resonator (SAWR) will be my main topic in my study which discusses the relationship between torque and wireless one port SAWR. Research method: By observing the single port SAWR equivalent circuit model, we can realize the relationship between added variable resistor and variable capacitance. Through the simulation, added variable resistor affected the centre frequency loss that is the added variable capacitance influenced on the shift of the centre frequency. In present, this study will emphasize on the resistance output. Therefore, variable resistor will be replaced by strain gage as SAW’s sensor. As the strain gage be put on the main axle, the main axle revolution will be changed by torsion which is equal in resistance value change. Thus, the SAWR which was put on the rotating axle was affected. The main analyses of designing SAWR are based on: (1) Taking the Cross & Schmidt’s COM model as the basis of analyzing Surface Acoustic Wave device. After manipulating the SAWR matrix and its parameters, using MATLAB simulate the frequency response. (2) Using the equivalent circuit of SAWR of Lumped-element and Microwave Office, Advance Design System (ADS) simulate the frequency variation. (3) Using the IE3D designed antenna and simulated its variation such as Return Loss, Bandwidth, VSWR…etc. (4) using manufacture method of wetting etching make the resonator. In terms of signal transmission methods, one is RF coupling and the other is antenna. My simulation and experiment was based on S parameter of network analyzer, which analyze the sensitivity of frequency, response and the loss of transmission. (the S parameter is the relation between input and output signal)