发明名称 |
Displacement sensing circuit less influenced by external noises. |
摘要 |
<p>A displacement sensing circuit for sensing a displacement of a measured object without any contact with the measured object. A detecting coil is disposed relative to the measured object to be capable of changing its inductance in response to a displacement of the measured object from a predetermined position. An output from the detecting coil is passed through a band-pass filter. The filter has a frequency band width which is equal to at least twice the upper limit of a response frequency of the sensing circuit, thereby outputting a signal less influenced by a noise. An output from the band-pass filter is detected to take a signal corresponding to the displacement of the measured object. <IMAGE></p> |
申请公布号 |
EP0435233(A1) |
申请公布日期 |
1991.07.03 |
申请号 |
EP19900125306 |
申请日期 |
1990.12.21 |
申请人 |
EBARA CORPORATION |
发明人 |
SHIRAO, YUJI;CHINO, HIROYUKI;NAKAZAWA, TOSHIHARU |
分类号 |
G01B7/14;G01B7/00;G01D5/20;G01D5/22 |
主分类号 |
G01B7/14 |
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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