DGaO·Proceedings ISSN 1614-8436
DE
Poster P44

Determination of δ-damping by heterodyne speckle interferometry

Ana Bayón1, José Manuel Chicharro2, Felix Salazar1
  1. 1Department of Applied Physics to Natural Resources (FARN), School of Mining Engineering, Universidad Politécnica de Madrid
  2. 2School of Industrial Engineering, University of Castilla-La Mancha

abayon@dfarn.upm.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).

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@inproceedings{dgao105-p44, title = {Determination of δ-damping by heterodyne speckle interferometry}, author = {Ana Bayón, José Manuel Chicharro, Felix Salazar}, booktitle = {DGaO-Proceedings, 105. Jahrestagung}, year = {2004}, publisher = {Deutsche Gesellschaft für angewandte Optik e.V.}, issn = {1614-8436}, note = {Poster P44} }
105. Annual Conference of the DGaO · Bad Kreuznach · 2004