| 摘要 |
<p>A sensor assembly (10) and method of forming the sensor assembly (10) for sensing count and tamper, where the count is related to an energy field having a gradient along an axis of sensitivity and where the tamper is related to a static energy field and where the energy comprising the static energy field is the same type as the energy comprising the energy field having a gradient includes an energy gradient detector (28) that has at least a first sensor (32, 33) spaced apart from and communicably coupled to a second sensor (34, 35) along the axis of sensitivity. A static energy detector (30) that has at least a first shielded sensor (50), the shielded sensor (50) being substantially shielded from the energy field having a gradient and from the static energy field. A second unshielded sensor (51) is communicably coupled to the shielded sensor (50). The invention further includes a method of detecting a spatially varying magnetic field.</p> |
