Non-Contact Circuit for Real-Time Electric and Magnetic Field Measurements

Report No. ARL-TR-7507
Authors: Sean M Heintzelman
Date/Pages: October 2015; 24 pages
Abstract: This report describes the US Army Research Laboratory (ARL) multimodal D-dot (MD-dot) sensor, a 1.25 inch x 2 inch integrated circuit that can stand alone or be attached to an energized conductor to measure both electric and magnetic fields simultaneously. The MD-dot circuit has programmable 0 to 80 dB output gain and 0–3.3 V DC offset to maximize dynamic range. Furthermore, active output control allows us to vary the signals for compatibility with most data acquisition (DAQ) input requirements; however, it is designed to work best with the ARL Real-Time Electric and Magnetic Integrated Sensor (ARTEMIS) smart sensing node. The gain and offset are programmed with 1Wire communication protocol, but are also compatible with serial peripheral interface (SPI) and universal asynchronous receiver-transmitter (UART) for increased programming flexibility. The gain and offset accuracy for the MD-dot is measured to allow real-time calculation of electric and magnetic fields. An ARL-designed electric-field cage is used to generate electric fields and characterize the sensor's frequency response, noise spectral density, and dynamic range.
Distribution: Approved for public release
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Last Update / Reviewed: October 1, 2015