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| Design of GMR-based Contactless Displacement Detecting System with Long Dynamic Range |
| DING Yi-jian1,WANG Chang-tao2,LIU Feng2,YE Xue-song2 |
1. Medical College , Zhejiang University, Hangzhou, Zhejiang 310027, China
2. College of BME & IS, Zhejiang University, Hangzhou, Zhejiang 310027, China |
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Abstract The low cost and contactless displacement detection with long dynamic range is becoming an objective requirement . After the detailed analysis on the negative factors for achieving high resolution performance in the Giant Magneto Resistive (GMR) based displacement detection systems, a customizable high-frequency magnetic field source with proportional gradient intensity was built to meet the requirement of long dynamic range detection, meanwhile, the lock-in amplification was associated with data-infusion to accomplish the detection of high resolution for displacement in magneto field. From these results of testing, it was found that the detection system can reach to high sensitivity of 0.1 micro-meters in the dynamic range of 0~100mm at least, therefore, the rationality of the design objective seem to be proved. These results will provide an available prototype for the design of MEMS in an amount of applications of high-precision contactless displacement detection, which include the research of bone strength in vivo.
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2010, Vol. 31 
