A Versatile Superconducting Magnetometer/Gradiometer System.
Abstract:
A versatile superconductive magnetometergradiometer system was designed and procured from a commercial vendor. A number of magnetic field sensing pick-up loops are mounted on a common substrate block and connected through a switching network to a single SQUID sensor. By suitably connecting these coils, it is possible to measure a component of the magnetic field of interest with an instrument noise level of 1.1 x 10-14 tesla rms per root hertz or at a reduced sensitivity range with an instrument noise level of 1.3 x10-13 tesla rms per root hertz. In addition, several of the coils can be connected in opposition to measure the diagonal component of the gradient dH sub idX sub i of the field of interest with an instrument noise level of 1.2 x 10-15 tesla rms per cm per root hertz. The dewar and probe assembly can be tilted in order to monitor either the horizontal or the vertical field component or diagonal gradient component of the field of interest. Author