公开(公告)号：US20120303305A1

公开(公告)日：2012-11-29

申请号：US13495636

申请日：2012-06-13

申请人： Johan Bergqvist ,  Sietse Wouters

发明人： Johan Bergqvist ,  Sietse Wouters

IPC分类号： G01R27/32 ,  G06F19/00

CPC分类号： G01D5/2208 ,  G01D5/225

摘要： An electronic circuit detecting proximity includes an excitation coil emitting an inductive excitation field toward a target. A first pair of detection coils obtains a first differential inductive signal that is modified by a transition of the target within the inductive field. An out-of phase second pair of detection coils obtains a second differential inductive signal that is modified by a transition of the target within the inductive field. A comparator generates a transition signal when the difference between the first and second differential signals reaches a threshold value. A stationary target, in a ferromagnetic or conductive material, creates an offset to the signals at the outlet of the coil pairs. The offset is decreased during the presence of a movable target within the same type of material or increased during the presence of a movable target within another type of material. A comparator detects the offset level.

摘要翻译： 电子电路检测接近度包括向目标发射感应激励场的激励线圈。 第一对检测线圈获得由感应场内的目标的转变修改的第一差分电感信号。 异相第二对检测线圈获得由感应场内的目标的转变修改的第二差分感应信号。 当第一和第二差分信号之间的差达到阈值时，比较器产生转换信号。 在铁磁或导电材料中的固定靶产生对线圈对出口处的信号的偏移。 在相同类型的材料中的可移动目标的存在期间偏移减小，或者在另一种类型的材料中的可移动目标的存在期间增加。 比较器检测偏移电平。

公开(公告)号：US09255818B2

公开(公告)日：2016-02-09

申请号：US13495636

申请日：2012-06-13

申请人： Johan Bergqvist ,  Sietse Wouters

发明人： Johan Bergqvist ,  Sietse Wouters

IPC分类号： G01D5/22

CPC分类号： G01D5/2208 ,  G01D5/225

摘要： An electronic circuit detecting proximity includes an excitation coil emitting an inductive excitation field toward a target. A first pair of detection coils obtains a first differential inductive signal that is modified by a transition of the target within the inductive field. An out-of phase second pair of detection coils obtains a second differential inductive signal that is modified by a transition of the target within the inductive field. A comparator generates a transition signal when the difference between the first and second differential signals reaches a threshold value. A stationary target, in a ferromagnetic or conductive material, creates an offset to the signals at the outlet of the coil pairs. The offset is decreased during the presence of a movable target within the same type of material or increased during the presence of a movable target within another type of material. A comparator detects the offset level.

摘要翻译： 电子电路检测接近度包括向目标发射感应激励场的激励线圈。 第一对检测线圈获得由感应场内的目标的转变修改的第一差分电感信号。 异相第二对检测线圈获得由感应场内的目标的转变修改的第二差分感应信号。 当第一和第二差分信号之间的差达到阈值时，比较器产生转换信号。 在铁磁或导电材料中的固定靶产生对线圈对出口处的信号的偏移。 在相同类型的材料中的可移动目标的存在期间偏移减小，或者在另一种类型的材料中的可移动目标的存在期间增加。 比较器检测偏移电平。