Fourier description of lock-in

J. A

Abstract


In this study, a new interpretation about the operation of a traditional lock-in and dual lock-in is presented from the viewpoint of Fourier analysis. Once the mathematical principles under which these devices operate are understood, we could take full advantage of the magnitude and phase of the Fourier coefficients to measure the physical variables, as shown in the final example of this study. Also, a comparison between signal-to-noise ratio (SNR) of a square reference lock-in and a pure sinusoid lock-in is also presented.

Keywords


Lock-in; description; measurement

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Revista Mexicana de Física E

ISSN: 2683-2216 (on line), 1870-3542 (print)

Semiannual publication of Sociedad Mexicana de Física, A.C.
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