Determination of δ-damping by heterodyne speckle interferometry
- 1Department of Applied Physics to Natural Resources (FARN), School of Mining Engineering, Universidad Politécnica de Madrid (Spain)
- 2School of Industrial Engineering, University of Castilla-La Mancha (Spain)
abayon [at] dfarn [dot] upm [dot] es
In that work we present a method to measure the δ-damping parameter using a heterodyne speckle interferometric set-up. The basic idea to analyze the decrement of the elastic waves consist of exciting longitudinal forced vibrations in a bar, in order to obtain the value of the amplitude of these oscillations as a function of the frequency. The δ-parameter can be measured directly from the resonance frequency and by the width of such a curve. The method was applied to nickel rods and nickel wires, and the results are that damping decreases with the magnetization of the material. That procedure has a high resolution and is more precise than the free vibration method (104. Tagung DGaO (2003), p.96).
@inproceedings{bayon2004p44,
author = {Bayón, Ana and Chicharro, José Manuel and Salazar, Felix},
title = {{Determination of δ-damping by heterodyne speckle interferometry}},
booktitle = {DGaO-Proceedings 2004},
series = {DGaO-Proceedings},
eventtitle = {105. Jahrestagung der DGaO},
eventdate = {2004-06-02/2004-06-05},
venue = {Bad Kreuznach},
publisher = {Deutsche Gesellschaft für angewandte Optik e.V.},
year = {2004},
pages = {P44},
langid = {english},
url = {https://dgao-proceedings.de/paper/105-p44}
}