Vibrating wires are common temperature probes in 3He experiments. By measuring mechanical resonance of a wire driven by AC current in magnetic field one can directly obtain temperature-dependent viscous damping. This is easy to do in a linear regime where wire velocity is small enough and damping force is proportional to velocity. At lowest temperatures in superfluid 3He-B a strong non-linear damping appears and linear regime shrinks to a very small velocity range. Expanding measurements to the non-linear area can significantly improve sensitivity. In this note I describe some technical details useful for analyzing such temperature measurements.
@article{arxiv.2303.01189,
title = {Using vibrating wire in non-linear regime as a thermometer in superfluid $^3$He-B},
author = {V. V. Zavjalov},
journal= {arXiv preprint arXiv:2303.01189},
year = {2023}
}