发明名称 |
Passive and wireless displacement measuring device |
摘要 |
A system that remotely measures displacement between two objects. A passive sensor is affixed between the objects. The internal sensor uses magnetic coupling between two sensor elements to measure their relative displacement. The sensors are either a) a permeable rod and a complimentary coil in parallel with a tuning capacitor; or b) two permeable rods, each having its own surrounding coil and a tuning capacitor. One of the sensor elements is affixed to each object which is to be monitored. When an interrogating device is placed near the sensors, a resonance can be measured whose frequency characteristics change in a reproducible manner with the relative displacement of the sensors. The resulting resonance characteristics can be calibrated in such a way as to enable the displacement of the objects to be determined.
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申请公布号 |
US6656135(B2) |
申请公布日期 |
2003.12.02 |
申请号 |
US20010789832 |
申请日期 |
2001.02.20 |
申请人 |
SOUTHWEST RESEARCH INSTITUTE |
发明人 |
ZOGBI SUSAN W.;CANADY LARRY D.;HELFFRICH JEROME A.;CERWIN STEPHEN A.;HONEYAGER KEVIN S.;DE LOS SANTOS ARMANDO;CATTERSON CHRISTOPHER B. |
分类号 |
A61B5/00;A61B5/103;A61B5/11;A61B17/88;A61B19/00;(IPC1-7):A61B5/103 |
主分类号 |
A61B5/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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