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- W4211046676 abstract "We present a portable optically pumped magnetometer instrument for ultra-sensitive measurements within the Earth's magnetic field. The central part of the system is a sensor head operating a MEMS-based Cs vapor cell in the light-shift dispersed Mz mode. It is connected to a compact, battery-driven electronics module by a flexible cable. We briefly review the working principles of the device and detail on the realization of both, sensor head and electronics. We show shielded and unshielded measurements within a static magnetic field amplitude of 50 uT demonstrating a noise level of the sensor system down to 140 fT/sqrt{Hz} and a sensor bandwidth of several 100 Hz. In a detailed analysis of sensor noise we reveal the system to be limited by technical sources with straightforward strategies for further improvement towards its fundamental noise limit of 12 fT/sqrt{Hz}. We assess the parameters defining the sensor bandwidth by theoretical modeling based on the Bloch equations. Finally, we compare our sensors' performance to a commercial SQUID system in a measurement environment typical for geomagnetic observatory practice and geomagnetic prospection." @default.
- W4211046676 created "2022-02-13" @default.
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- W4211046676 date "2022-02-11" @default.
- W4211046676 modified "2023-09-25" @default.
- W4211046676 title "Integrated Optically Pumped Magnetometer for Measurements within Earth’s Magnetic Field" @default.
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- W4211046676 doi "https://doi.org/10.1103/physrevapplied.17.024034" @default.
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