Sensor for count and tamper detection

Details Sensor for count and tamper detection Sensor for count and tamper detection

1997-09-12

1999-06-08

Wu, Daniel J.

Communications: electrical

Condition responsive indicating system

Specific condition

3405681, 340657, 324110, 324142, G08B 2100

Patent

active

059107740

ABSTRACT:
A sensor assembly and method of forming the sensor assembly 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 that has at least a first sensor spaced apart from and communicably coupled to a second sensor along the axis of sensitivity. A static energy detector that has at least a first shielded sensor, the shielded sensor being substantially shielded from the energy field having a gradient and from the static energy field. A second unshielded sensor is communicably coupled to the shielded sensor. The invention further includes a method of detecting a spatially varying magnetic field.

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