An Optically Pumped Magnetometer Working in the Light-Shift Dispersed M-z Mode

作者：Schultze Volkmar^*; Schillig Bastian; IJsselsteijn Rob; Scholtes Theo; Woetzel Stefan; Stolz Ronny

来源：Sensors (Switzerland), 2017, 17(3): 561.

DOI：10.3390/s17030561

• magnetometer
• optically pumped magnetometer
• light shift
• M-z
• magnetic-field resolution
• Latin Hypercube Sampling
• Downhill simplex

We present an optically pumped magnetometer working in a new operational modethe light-shift dispersed M-z (LSD-Mz) mode. It is realized combining various features; (1) high power off-resonant optical pumping; (2) M-z configuration, where pumping light and magnetic field of interest are oriented parallel to each other; (3) use of small alkali metal vapor cells of identical properties in integrated array structures, where two such cells are pumped by circularly polarized light of opposite helicity; and (4) subtraction of the M-z signals of these two cells. The LSD-Mz magnetometer's performance depends on the inherent and very complex interplay of input parameters. In order to find the configuration of optimal magnetometer resolution, a sensitivity analysis of the input parameters by means of Latin Hypercube Sampling was carried out. The resulting datasets of the multi-dimensional parameter space exploration were assessed by a subsequent physically reasonable interpretation. Finally, the best shot-noise limited magnetic field resolution was determined within that parameter space. As the result, using two 50 mm(3) integrated vapor cells a magnetic field resolution below 10 fT/root Hz at Earth's magnetic field strength is possible.

• 出版日期2017-3