A sound card based multi-channel frequency measurement system

Details A sound card based multi-channel frequency measurement system A sound card based multi-channel frequency measurement system

2005-06-08

arxiv.org/abs/physics/0506068v1

Physics

Instrumentation and Detectors

4 pages, 3 figures, 1 table

Scientific paper

10.1051/epjap:2006020

For physical processes which express themselves as a frequency, for example magnetic field measurements using optically-pumped alkali-vapor magnetometers, the precise extraction of the frequency from the noisy signal is a classical problem. We describe herein a frequency measurement system based on an inexpensive commercially available computer sound card coupled with a software single-tone estimator which reaches Cram\'er--Rao limited performance, a feature which commercial frequency counters often lack. Characterization of the system and examples of its successful application to magnetometry are presented.

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