Experiment for Radiation From Horizontal Loop Located on the Earth’s Surface

This paper develops a “ground-airborne” model for a horizontal large loop, proposes a novel noise cancellation technique, and conducts an experiment for verification. In the experiment, large horizontal loop located on the earth's surface is employed as a source antenna to generate extremely low frequency magnetic fields. Using a potassium optically pumped magnetometer GSMP-35A suspended below the helicopter, the fields are recorded on three survey planes at different heights. Comparing the theoretical solution with experiments, the magnetic field envelopes are in good agreement with the theoretical solution and validity of the noise cancellation procedure is verified.