Electricity: measuring and testing – Magnetic – With means to create magnetic field to test material
Patent
1994-03-10
1996-11-19
Strecker, Gerard R.
Electricity: measuring and testing
Magnetic
With means to create magnetic field to test material
209549, 209567, 324226, 324262, 340568, G01R 3312, G01N 2772, G08B 2100, B07C 5344
Patent
active
055766218
ABSTRACT:
A metal detector especially adapted to prevent the inadvertent or unauthorized deposit of metal objects into receptacles includes a housing provided with a central opening surrounded by a funnel-like surface for directing articles into a receptacle such as a medical waste disposal bag, a trash can, or a laundry hamper. For use in the medical field to prevent the inadvertent disposal of surgical instruments, the metal detector housing may be pivotally connected by a hinge mechanism to a medical waste bag disposal bag holding cart to allow convenient removal and replacement of disposal bags. Battery powered detection circuitry includes a detector coil surrounding the central opening and operative to trigger visual and audible alarms for signalling the passage of a metal article through the housing opening if the output voltage in the detector circuit exceeds a predetermined threshold value. The detection circuitry includes an auto calibration feature which compares the output voltage of the detection coil with a reference voltage and integrates the results of the comparison over time to stabilize the sensitivity of the metal detector, while ignoring transient voltage fluctuations. A bar graph signal strength display in conjunction with a peak hold circuit allows an operator to evaluate the size of a metal article triggering an alarm.
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Denver Dynamics, Inc.
Isaac John L.
Strecker Gerard R.
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