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Lena/Aug 2016: Difference between revisions
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→Fundamental noise limit estimates
ElenaZhivun (talk | contribs) |
ElenaZhivun (talk | contribs) |
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Mx magnetometers sensitivity is limited because they have lower alkali vapor concentration (can't heat coating above 60°C), and radiation trapping (no N2 in the cells). The SERF with OTS coating has narrower zero-field resonance line, so the probe can be detuned much closer than in the magnetometers with buffer gas. They also run at lower temperatures and so they have larger T1 due to decreased self-spin destruction collisions rate.
The fetal heartbeat largest feature size is of an order of 1 pT, so 1 fT/sqrtHz sensitivity seems to be still good enough.
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