发明名称 |
System and method of perpendicularly magnetizing position information in a magnetically hard layer of a moving component |
摘要 |
A position-sensing system magnetically senses the position of a piston rod moving with respect to a cylinder. A magnetically hard layer on the piston rod provides a recording medium. Information is perpendicularly magnetized in regions of the magnetically hard layer. These regions provide an encoding scheme for determining the position of the piston rod. Magnetic-field sensors are positioned over redundant tracks of magnetically recorded regions. Each magnetic-field sensor positioned over a given track senses the same magnetized regions while the piston rod moves with respect to the cylinder. Other magnetic-field sensors can sense ambient fields for use in performing common-mode rejection. A write head can dynamically repair damaged or erased regions detected by the magnetic-field sensors. Energized by a battery-backup power source, the magnetic-field sensors and associated circuitry can continue to track movement of the piston rod when the machinery is off.
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申请公布号 |
US7755350(B2) |
申请公布日期 |
2010.07.13 |
申请号 |
US20080252342 |
申请日期 |
2008.10.15 |
申请人 |
SRI INTERNATIONAL |
发明人 |
ARNS, JR. DONALD C.;GARCIA PABLO |
分类号 |
G01B7/14 |
主分类号 |
G01B7/14 |
代理机构 |
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