Geophysical Exploration

Stolz, R.

doi:10.1002/3527600434.eap762

Cited by 2 publications

(2 citation statements)

References 51 publications

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“…Other important applications lay in the fields of geophysical exploration, geomagnetism, and archeology, where magnetic measurements at highest sensitivity are required within Earth's magnetic field strength [3,4]. To date, in most of these applications demanding for ultimate performance, superconducting quantum interference devices (SQUIDs) are the sensors of choice [5][6][7]. However, recent developments in the field of optically pumped magnetometers (OPMs) [8] pave the way towards OPM systems competitive with SQUIDs with respect to magnetic field resolution, but featuring additional advantages, e. g., avoiding the need for cryogenics or gaining higher flexibility due to smaller sensor sizes [9,10].…”

Section: Introductionmentioning

confidence: 99%

Integrated optically pumped magnetometer for measurements within Earth's magnetic field

Oelsner,

IJsselsteijn,

Scholtes

et al. 2020

Preprint

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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 µT demonstrating a noise level of the sensor system down to 100 fT/ √ 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/ √ Hz. We compare our sensors' performance to a commercial SQUID system in a measurement environment typical for geomagnetic observatory practice and geomagnetic prospection.

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Section: Introductionmentioning

confidence: 99%

Integrated optically pumped magnetometer for measurements within Earth's magnetic field

Oelsner,

IJsselsteijn,

Scholtes

et al. 2020

Preprint

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“…The most sensitive magnetic field sensors are based on superconducting quantum interference devices [12,13]. They have been optimized to allow sub-femtotesla field gradient resolution even in Earth's magnetic field [14] and today, besides others, are used for geomagnetic and archeological explorations [15][16][17]. Still the requirements due to cryogenic liquids is demanding and for low temperature superconducting sensors the costs of liquid helium are high.…”

Section: Introductionmentioning

confidence: 99%

Performance analysis of an optically pumped magnetometer in Earth’s magnetic field

Oelsner

Schultze

IJsselsteijn

et al. 2019

EPJ Quantum Technol.

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We experimentally investigate the influence of the orientation of optically pumped magnetometers in Earth's magnetic field. We focus our analysis to an operational mode that promises femtotesla field resolutions at such field strengths. For this so-called light-shift dispersed M z (LSD-Mz) regime, we focus on the key parameters defining its performance. That are the reconstructed Larmor frequency, the transfer function between output signal and magnetic field amplitude as well as the shot noise limited field resolution. We demonstrate that due to the use of two well balanced laser beams for optical pumping with different helicities the heading error as well as the field sensitivity of a detector both are only weakly influenced by the heading in a large orientation angle range.

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Geophysical Exploration

Abstract: The article contains sections titled:IntroductionLaboratory InstrumentsGeomagneticsElectromagnetic MethodsGravimetryFuture Impact ofSQUIDin Geophysics

Cited by 2 publications

References 51 publications

Integrated optically pumped magnetometer for measurements within Earth's magnetic field

Integrated optically pumped magnetometer for measurements within Earth's magnetic field

Performance analysis of an optically pumped magnetometer in Earth’s magnetic field

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