Investigation of Measurement Techniques for Transient Magnetic Fields

Small,time-varying magnetic fields, on the order of two gauss, were investigated to determine the problems associated with transient and steady state fields, and resultant interference generation. Difficulty in measuring small fields arises since the earth's magnetic field is of the order of . 5 gauss and varies at different locations, since the vector components of the earth's magnetic field are not constant. Other considerations in the measurement of small fields are environmental conditions, such as metals with residual magnetism in close proximity and permanent magnet fields from motors or meters, which have magnetic field intensities from 1 to 1 00 0 gauss. The environment and directivity of the measuring instrument, therefore, becomes an important factor to consider.