Zero-Point Drift in Low-Frequency Mechanical Spectroscopy
The concept of the ‘zero-point drift’, ZPD, is introduced and analyzed on the basis of mechanical loss measurements carried out in a low-frequency mechanical spectrometer – inverted torsion pendulum. It is demonstrated that the ZPD, which modifies damped harmonic oscillations leads to false values of the logarithmic decrement computed from several widely accepted algorithms.
B.M. Darinskii and L.B. Magalas
L. B. Magalas and A. Piłat, "Zero-Point Drift in Low-Frequency Mechanical Spectroscopy", Solid State Phenomena, Vol. 115, pp. 285-292, 2006