Low-Cost Total Field Magnetometer based on Optically-Pumped Alkali Atoms

Physical Sciences Inc. (PSI) proposes to develop a compact low-cost magnetometer for use in airborne and in-water ASW. The novel sensor will combine optical pumping of alkali atoms with sensitive balanced ratiometric detection and frequency counting electronics. PSI has successfully demonstrated sensitive magnetic field detection using the proposed approach in previous programs. During the proposed Phase I program, PSI will design a sensor measurement head and control unit in a low-cost package with size, weight, and power specifications that meet Navy requirements for use on unmanned aerial vehicles, buoys, and torpedo platforms. Critical electronic subcomponents will be fabricated and demonstrated in Phase I. The compact electronics will be combined with a laboratory measurement head during the Phase I Option program to demonstrate sensitive magnetic field detection. During the subsequent Phase II program, two fully operational prototype magnetometer systems will be fabricated and tested to verify operation and performance under representative measurement conditions. PSI has extensive experience applying its successful line of commercial absorption spectroscopy hardware and software to demonstrate sensitive magnetometers. This expertise will be used to transition the proposed magnetometer to volume manufacturing in Phase III.