Development of a Measuring System for nT-order magnetic Fields and Electrostatic Fields Generated near a Human Body

In this study a system was developed that could measure nT-order magnetic fields and electrostatic field generated near a human body at normal temperature. The problem of the usual system that used a small magnetic shielding case (double box type) to cover the subject's palm/hands was improved by fixing the hands in non-contact condition, preventing the deformation of the shield case, ventilating inside the case compulsorily and installing the 3-axis type Hall magnetometer. Another improvement was the installation of 3-axis flux gate magnetometers and a electrostatic field meter (capacitance vibration system) in behind of the subject in order to measure the magnetic and electrostatic fields outside of the small magnetic shielding case. The preliminary measurements were made for ordinary persons (eight subjects) and qigong masters/ students (two subjects). Changes of magnetic fields larger than 1nT/min and electrostatic fields larger than 0.001kV were not measured. In further study, temperature correction data, data of artifacts of background noise, data of magnetic fields sensors and electrostatic fields sensors were necessary to be collected and analyzed.