Frequency-dependent amplitude correction to free-precession scalar magnetometers
Fuente:
arXiv
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| Autori principali: | , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| Soggetti: | |
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| _version_ | 1866912084050051072 |
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| author | Limes, M. E. Rathbun, L. Foley, E. L. Kornack, T. Hainsel, Z. Braun, A. |
| author_facet | Limes, M. E. Rathbun, L. Foley, E. L. Kornack, T. Hainsel, Z. Braun, A. |
| contents | Pump and probe scalar atomic magnetometers show incredible potential for real-world, traditionally difficult measurement environments due to their high dynamic range and linearity. Previously, it has been assumed these scalar magnetometer have a flat response across their bandwidth, and flat noise floor. Here we show that standard fitting routines, used to extract the magnetic field, result in a non-linear frequency dependent response across the sensor bandwidth, due to the time-averaged nature of such free precession measurements. We present an analytic correction dependent on dead-time, and show how this equation can also correct the sensor spectral density. The maximum in-band amplitude loss approaches 29\% as the frequency of interest becomes the Nyquist frequency, making a significant correction for applications such as source localization in magnetoencephalography. These pump and probe atomic magnetometers also are known to have large aliasing of out-of-band signals, and we propose a scheme where the frequency of out-of-band signals can be identified by performing fits with varying dead-time on the raw free-precession sensor data. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2410_18224 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Frequency-dependent amplitude correction to free-precession scalar magnetometers Limes, M. E. Rathbun, L. Foley, E. L. Kornack, T. Hainsel, Z. Braun, A. Atomic Physics Pump and probe scalar atomic magnetometers show incredible potential for real-world, traditionally difficult measurement environments due to their high dynamic range and linearity. Previously, it has been assumed these scalar magnetometer have a flat response across their bandwidth, and flat noise floor. Here we show that standard fitting routines, used to extract the magnetic field, result in a non-linear frequency dependent response across the sensor bandwidth, due to the time-averaged nature of such free precession measurements. We present an analytic correction dependent on dead-time, and show how this equation can also correct the sensor spectral density. The maximum in-band amplitude loss approaches 29\% as the frequency of interest becomes the Nyquist frequency, making a significant correction for applications such as source localization in magnetoencephalography. These pump and probe atomic magnetometers also are known to have large aliasing of out-of-band signals, and we propose a scheme where the frequency of out-of-band signals can be identified by performing fits with varying dead-time on the raw free-precession sensor data. |
| title | Frequency-dependent amplitude correction to free-precession scalar magnetometers |
| topic | Atomic Physics |
| url | https://arxiv.org/abs/2410.18224 |