| Autor: |
Iivanainen J, Carter TR, Dhombridge JE, Read TS, Campbell K, Abate Q, Ridley DM, Borna A, Schwindt PDD |
| Jazyk: |
angličtina |
| Zdroj: |
Optics express [Opt Express] 2024 May 06; Vol. 32 (10), pp. 18334-18351. |
| DOI: |
10.1364/OE.517961 |
| Abstrakt: |
We present a novel four-channel optically pumped magnetometer (OPM) for magnetoencephalography that utilizes a two-color pump/probe scheme on a single optical axis. We characterize its performance across 18 built sensor modules. The new sensor implements several improvements over our previously developed sensor including lower vapor-cell operating temperature, improved probe-light detection optics, and reduced optical power requirements. The sensor also has new electromagnetic field coils on the sensor head which are designed using stream-function-based current optimization. We detail the coil design methodology and present experimental characterization of the coil performance. The magnetic sensitivity of the sensor is on average 12.3 fT/rt-Hz across the 18 modules while the average gradiometrically inferred sensitivity is about 6.0 fT/rt-Hz. The sensor 3-dB bandwidth is 100 Hz on average. The on-sensor coil performance is in good agreement with the simulations. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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