Patent ID: 9702959
Date: 2017-07-11
CPC Classifications: G01R

Claim:
1. A method for remote sensing to derive a calibrated power measurement for a power distribution point, the method comprising: sensing, by one or more magnetic field sensors of a sensor module, a magnetic field emitted by the power distribution point, wherein the sensor module is positioned in proximity to the power distribution point; sensing, by a voltage sensor coupled to the sensor module, a voltage carried in the power distribution point; generating, by a first processor coupled to the sensor module, an uncalibrated power measurement for each magnetic field sensor, the uncalibrated power measurement derived from the magnetic field sensed by the magnetic field sensor and the voltage sensed by the voltage sensor; determining, by a second processor coupled to the sensor module, a response of each magnetic field sensor to a known power load being drawn through the power distribution point; deriving, by the second processor, a transfer function using the response of each magnetic field sensor to the known power load, comprising deriving a series of coefficients, each coefficient associated with the uncalibrated power measurement for a magnetic field sensor, wherein deriving the series of coefficients includes determining a quasi-power for each magnetic field sensor based upon the uncalibrated power measurement for the magnetic field sensor; and applying, by the second processor, the transfer function to the uncalibrated power measurement for each magnetic field sensor to generate the calibrated power measurement for the power distribution point.