G - Physics – 01 – R
Patent
G - Physics
01
R
G01R 23/09 (2006.01)
Patent
CA 2125327
A process for determining the fundamental frequency or period of each cycle of aseries of contiguous cycles of an alternating current input wave from an alternating current source is described in which each sequential cycle in the series is treated as the current cycle, and the following contiguous cycle is treated as the succeeding cycle. The steps include: (A) starting to integrate the amplitudes of the current cycle of the input wave when the amplitude of the input wave exceeds a given amplitude in a given polarity; (B) continuing to integrate the amplitudes of the current cycle of the input wave for a first given period of time which is less than the shortest expected wave period being detected and during the first period of time ignoring the value of the integral; (C) continuing to integrate the amplitudes of the current cycle of the input wave for a second period of time until the value of the integral is insubstantially different from its value when the integration started in step (A); (D) maintaining the value of the integral at the starting value prior to the input wave again reaching the given amplitude in the given polarity; (E) repeating steps (A) through (D) for the succeeding cycle of the input wave; and (F) measuring the time between any given event in the steps (A) through (D) for the current cycle and the corresponding event in the step (A) through (D) for the succeeding cycle, whereby the measured time can be used to determine the frequency or period of the fundamental frequency.
Cassan Maclean
Haas Peter
LandOfFree
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