Noninvasive Magnetic-Marking-Based Flow Metering with Optically Pumped Magnetometers
| Autor: | Leonhard Schmieder, Peter A. Koss, Armin Lambrecht, Frank Kühnemann |
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| Jazyk: | angličtina |
| Rok vydání: | 2022 |
| Předmět: | |
| Zdroj: | Applied Sciences, Vol 12, Iss 3, p 1275 (2022) |
| Druh dokumentu: | article |
| ISSN: | 12031275 2076-3417 |
| DOI: | 10.3390/app12031275 |
| Popis: | 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. |
| Databáze: | Directory of Open Access Journals |
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