Calibration Methodology for a 3D Measurement System of Electromagnetic Radiation

Abstract

The proposed paper explains the calibration methodology of a high resolution 3D measurement system for electromagnetic radiations generated by a wireless power emitter, WPE. This system [1] consists of a CNC manipulator for the radiation transducer and an advanced board for its signal acquisition and processing, both managed by the computer applications.Moreover, the contribution focuses on describing the accuracy and traceability of the research applied to the entire measuring path, namely: geometric calibration of the 3D field sensor on the orthogonal axes, electronic amplifiers adjustment on each channel, the rms-to-dc converter calibration and the fmal ADC converter settings. Particularly, a large emphasis is put on the dc-voltage linearization corresponding to the measured field over its whole range, as well as to the field direction identification by comparing the phase between the input and output reference signals. Taking into account that a full measurement sequence contains approx 68 kpoints, the time-domain analysis has not been neglected, leading to the synchronization of sensor movement with filtering-capture, digital conversion and data recording.