Electricity: measuring and testing – Magnetic – With means to create magnetic field to test material
Patent
1994-11-21
1996-09-24
O'Shea, Sandra L.
Electricity: measuring and testing
Magnetic
With means to create magnetic field to test material
324234, 324228, G01R 3312, G01N 2772
Patent
active
055594360
ABSTRACT:
A counter is provided for measuring counting transitions of an oscillator having an inductor in a frequency determining circuit. The inductor is at least in part air-cored and has a port therein for admitting a sample diamond for testing. First, the oscillations are up counted over a precise time interval with no sample present, and then a sample diamond is placed into the pont to change the frequency of the circuit by an amount related to the quantity of ferromagnetic material in the sample diamond. Thereafter, a down count is performed for the oscillations with the sample diamond in place over a second time interval equal to the first interval. The difference in the up counts and the down counts is determined and displayed in a digital readout as a measure of the degree of likelihood of the sample being synthetic.
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Matthews Marion
Perry Charles R.
Matthews Marion
O'Shea Sandra L.
Patidar Jay M.
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