Archive

This engineering study evaluates and calibrates an EMF area monitor for the 300 kHz–20 MHz frequency band using a multi-wire transverse electromagnetic (MWTEM) transmission line as a controlled electric-field source. The authors highlight that low-frequency electric-field measurements can be sensitive to boundary…

This paper describes the design, calibration, and experimental validation of a low-cost tri-axial sensor for monitoring 50 Hz magnetic fields from high-voltage power lines. The sensor was calibrated on-board and in-lab against a narrowband EHP-50 benchmark and then verified in situ at two locations, with reported…

This study evaluated whether a lightweight Mu-metal and copper mesh shielded helmet with EMF channels could reduce external electromagnetic interference enough to measure cortically generated EMF using non-contact induction sensors without a shielded room. In five volunteers performing motor, verbalization, and…

This study describes a helmet-based, non-contact method to continuously measure electromagnetic field activity associated with human brain neuronal activity during thought tasks. Volunteers performed motor movement, motor imagery, and emotional imagery while brain EMF was recorded. The authors report discernible…

This article describes a signal-processing/measurement concept in pulsed magnetic resonance: achieving phase cycling through sinusoidal magnetic field modulation rather than changing pulse phases. The abstract states that modulation parameters can control spin precession phases, enabling separation of unwanted…

This engineering study describes a method to improve the sensitivity of Faraday-effect-based heterodyning fiber laser sensors for magnetic field measurement. It reports an inverse relationship between magnetic-field sensitivity and intra-cavity linear birefringence, supported by theory and experimental birefringence…

This paper presents a theoretical and experimental demonstration of a photonic RF phase shifter based on a dual-parallel Mach-Zehnder modulator using a two-drive scheme. The approach aims to mitigate residual optical carrier effects and avoid a lowest-frequency limitation from an optical filter by driving the…

This study characterizes the electrical potential on the surface of ~300 nm SiO2 grown on single-crystalline Si under ambient conditions using electric field microscopy. It reports an inhomogeneous surface potential with fluctuations up to ~0.4 V over ~1 µm regions. The authors propose these fluctuations could affect…