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  4. Noninvasive Magnetic-Marking-Based Flow Metering with Optically Pumped Magnetometers
 
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2022
Zeitschriftenaufsatz
Titel

Noninvasive Magnetic-Marking-Based Flow Metering with Optically Pumped Magnetometers

Abstract
We present a noninvasive procedure that measures the flow velocity of a fluid by using polarized hydrogen nuclei in the fluid. The measurement procedure is based on a time-of-flight method where magnetic information is applied on the fluid with a permanent magnet and an RF-pulse. In contrast to other methods, this magnetic-marking method works without tracers. The read-out of the magnetic information is performed by optically pumped magnetometers downstream. In order to function, the magnetometers have to be operated in a magnetic shield with magnetic field strengths lower than 100 nT, i.e., in the zero-to-ultra-low-field regime. In this regime, the magnetometers are capable of detecting induced magnetic signals of 10 pT or less with an inline-flow setup. The results presented in this paper demonstrate the viability of optically pumped magnetometers for flow metering. The first metering results yielded an average accuracy of 3% at flow velocities between 13 cm/s and 22.4 cm/s.
Author(s)
Schmieder, Leonhard
Fraunhofer-Institut für Physikalische Messtechnik IPM
Koss, Peter A.
Fraunhofer-Institut für Physikalische Messtechnik IPM
Lambrecht, Armin
Fraunhofer-Institut für Physikalische Messtechnik IPM
Kühnemann, Frank
Fraunhofer-Institut für Physikalische Messtechnik IPM
Zeitschrift
Applied Sciences
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DOI
10.3390/app12031275
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Language
Englisch
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IPM
Tags
  • Optically Pumped Magn...

  • ZULF-NMR

  • Flow Metering

  • time-of-flight measur...

  • inline measurement

  • calibration-free

  • tracer-free

  • noninvasive

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