发明名称 |
Electrostatic transducer for length measurement system |
摘要 |
A non-contacting electrostatic mark/sense length measurement gauge is used to place discrete areas of electrostatic charge at very accurately spaced intervals along a relatively moving material surface. Special construction of both the electrostatic marking and sensing transducers is employed. To compensate for expected unreliability of the mark/sense length gauge, a conventional highly reliable but less accurate contacting length gauge (such as a tachometer in rolling contact with the relatively moving material) is employed. The output from the electrostatic mark/sense length gauge and from the tachometer length gauge are combined by special electronic circuits to provide a length measurement of the passing material which is both highly accurate and reliable under all expected measurement conditions.
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申请公布号 |
US4438402(A) |
申请公布日期 |
1984.03.20 |
申请号 |
US19810277845 |
申请日期 |
1981.06.26 |
申请人 |
AUTECH CORPORATION |
发明人 |
CULLEN, DONALD L.;ROBERTSON, JOHN A. |
分类号 |
G01B7/04;(IPC1-7):G01N27/60 |
主分类号 |
G01B7/04 |
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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