Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1986-11-04
1989-06-13
Pellinen, A. D.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
324 714, 361180, G01R 2716
Patent
active
048396028
ABSTRACT:
A device having a detector element for detecting small particles of metal moving in a stream of particulate matter, such as tobacco filler. The detector element is a coil through which the stream passes. The coil is the inductor of an oscillating circuit and is also part of the negative feedback loop of an operational amplifier. Inductance changes caused by the presence of metal become impedance changes that alter the amplifier gain, changing the amplitude of the AC component of an alternating current output signal. The signal peaks are shifted further, increasing detector amplitude, by coupling the signal through a capacitor to a source of potential so that the DC component of the signal also changes as the change in inductance allows current to flow through the capacitor.
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Ingerman Jeffrey H.
Isackson Robert M.
Pellinen A. D.
Philip Morris Incorporated
Wysocki A. Jonathan
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