Effect of linear drifts and low-frequency noise in phase shift measurements
- 1 August 1980
- journal article
- research article
- Published by AIP Publishing in Review of Scientific Instruments
- Vol. 51 (8) , 1105-1108
- https://doi.org/10.1063/1.1136371
Abstract
The presence of slowly varying signal drifts or low frequency (subharmonic) contributions can produce significant errors in the calculation of phase shifts using a correlation analysis. Under these conditions, the phase shift calculation becomes dependent on the reference signal phase angle. In this paper, we propose a modification to the correlation analysis to remove this dependency. We also present our analysis in discrete form to enable a digital implementation. Finally, we discuss the adverse effects that changes in the limits of integration can have on the phase shift calculation under the presence of linear signal drifts.Keywords
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