发明授权
US5117155A Method and apparatus employing two independent means for nulling an
ambient magnetic field
失效
采用两个独立的方式来对环境磁场进行归零的方法和装置
- 专利标题： Method and apparatus employing two independent means for nulling an ambient magnetic field
- 专利标题（中）： 采用两个独立的方式来对环境磁场进行归零的方法和装置
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申请号： US592691申请日： 1990-10-03
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公开(公告)号： US5117155A公开(公告)日： 1992-05-26
- 发明人: Frederick T. Buhler
- 申请人： Frederick T. Buhler
- 申请人地址： CA Anaheim
- 专利权人： Interstate Electronics Corp.
- 当前专利权人： Interstate Electronics Corp.
- 当前专利权人地址： CA Anaheim
- 主分类号： H01J29/00
- IPC分类号： H01J29/00 ; H04N9/29
摘要：
A method for controlling the magnetic field value within a specific volume subject to an external ambient magnetic field wherein detection means detecting the value of the ambient magnetic field in the volume is included, together with compensation means for nulling the ambient field in the volume within a predetermined compensation range. The method and apparatus includes use of a deperming means for inserting a magnetizing field independent of the compensation means into the volume whenever the value of the ambient magnetic field detected becomes greater than the predetermined compensation range.
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