Static magnetic field metal detector
    2.
    发明授权
    Static magnetic field metal detector 失效
    静磁场金属探测器

    公开(公告)号:US3889249A

    公开(公告)日:1975-06-10

    申请号:US35385373

    申请日:1973-04-23

    申请人: SPERRY RAND CORP

    IPC分类号: G01V3/10 G08B21/00

    CPC分类号: G01V3/107 Y10T307/766

    摘要: A static magnetic field detector senses the passage of ferrous or magnetic objects, employing a balanced pick up coil configuration providing substantial self-cancellation of spurious background signals. The pick up coils are disposed in a uniform static magnetic field and are cooperatively effective to sense the presence of such objects with respect to an extended passage way by reacting to the field distortion caused by the object to produce an alarm or control signal. Further reduction of the effects of spurious background signals is afforded by novel means for processing the signals generated within the detector coils providing filtering and threshold functions. An adaptive threshold control circuit provides automatic adjustment of the threshold level of object detection.

    摘要翻译: 静态磁场检测器检测铁或磁性物体的通过,采用平衡拾取线圈配置,提供假背景信号的实质自取消。 拾取线圈被布置在均匀的静磁场中,并且协同有效地通过对由物体引起的场失真反应以产生警报或控制信号来感测相对于延伸通路的这种物体的存在。 通过用于处理在提供滤波和阈值功能的检测器线圈内产生的信号的新颖手段,进一步降低了杂散背景信号的影响。 自适应阈值控制电路提供物体检测阈值水平的自动调整。