In this work, we describe different configurations of optical fiber interferometers (types Michelson and Mach-Zehnder) used to measure velocities during dynamical material's behaviour studies. We detail the algorithms of processing developed and optimized to improve the performance of these interferometers especially in terms of time and frequency resolutions. Three methods of analysis of interferometric signals were studied. For Michelson interferometers, the time-frequency analysis of signals by Short-Time Fourier Transform (STFT) is compared to a time-frequency analysis by Continuous Wavelet Transform (CWT). The results have shown that the CWT was more suitable than the STFT for signals with low signal-to-noise, and low velocity and high acceleration areas. For Mach-Zehnder interferometers, the measurement is carried out by analyzing the phase shift between three interferometric signals (Triature processing). These three methods of digital signal processing were evaluated, their measurement uncertainties estimated, and their restrictions or operational limitations specified from experimental results performed on a pulsed power machine.
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March 2014
Research Article|
March 18 2014
Digital signal processing for velocity measurements in dynamical material's behaviour studies
Julien Devlaminck;
Julien Devlaminck
CEA
, DAM, GRAMAT, F-46500 Gramat, France
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Jérôme Luc;
Jérôme Luc
CEA
, DAM, GRAMAT, F-46500 Gramat, France
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Pierre-Yves Chanal
Pierre-Yves Chanal
CEA
, DAM, GRAMAT, F-46500 Gramat, France
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Rev. Sci. Instrum. 85, 035109 (2014)
Article history
Received:
October 23 2013
Accepted:
February 11 2014
Citation
Julien Devlaminck, Jérôme Luc, Pierre-Yves Chanal; Digital signal processing for velocity measurements in dynamical material's behaviour studies. Rev. Sci. Instrum. 1 March 2014; 85 (3): 035109. https://doi.org/10.1063/1.4866683
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