ABSTRACT
Magnetic field strength is measured using a variety of different technologies. Each technique has unique properties for particular applications. These applications can range from simply sensing the presence or change in the field to the precise measurements of a magnetic field’s scalar and vector properties. The induction coil and fluxgate magnetometers are the most widely used vector measuring instruments. The superconducting quantum interference device magnetometers are the most sensitive of all magnetic field measuring instruments. The air-core loop antenna is particularly useful for measuring magnetic fields with frequencies from 100 Hz to several megahertz. The fluxgate magnetometer has been and is the workhorse of magnetic field strength instruments both on Earth and in space. Scalar magnetometers measure the magnitude of the magnetic field vector by exploiting the atomic and nuclear properties of matter. The two most widely used scalar magnetometers are the proton precession and the optically pumped magnetometer.
