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Heterodyne Diffracted Beam Photonic Doppler Velocimeter (DPDV) for Pressure-Shear Shock Experiments

  • M. MelloEmail author
  • C. Kettenbeil
  • M. Bischann
  • Z. Lovinger
  • G. Ravichandran
Conference paper
Part of the Conference Proceedings of the Society for Experimental Mechanics Series book series (CPSEMS)

Abstract

We present details on the design and validation of a heterodyne diffracted beam photonic Doppler velocimeter (DPDV) for pressure-shear plate impact (PSPI) shock experiments. The fiber optic interferometer collects symmetrically diffracted 1st order beams produced by a thin, specular, metallic grating deposited on the rear surface of the impacted target plate and separately interferes each of these beams with a reference beam of a slightly increased wavelength. The resulting interference signals contain an upshifted carrier signal with a constant frequency at zero particle velocity. Signal frequency content in recorded waveforms from PSPI experiments is extracted using a moving-window DFT algorithm and then linearly combined in a post- processing step to decouple and extract the normal and transverse velocity history of the rear target surface. The 0th order (normally reflected) beam can also be interfered in a separate heterodyne PDV configuration to obtain an additional, independent measurement of the normal particle velocity. An overview of the DPDV configuration is presented along with a discussion of the interferometer sensitivities to transverse and normal particle velocities. Results from a normal impact experiment conducted on Y-cut quartz are presented as experimental validation of the technique.

Keywords

Heterodyne Diffraction Pressure-shear Transverse particle velocity Y-cut quartz 

References

  1. 1.
    Kim, K., Clifton, R.J., Kumar, P.: A combined normal- and transverse-displacement interferometer with an application to impact of Y-cut quartz. J. Appl. Phys. 48, 4132–4139 (1977)CrossRefGoogle Scholar
  2. 2.
    Chhabildas, L.C., Sutherland, H.J., Asay, J.R.: A velocity interferometer technique to determine shear-wave particle velocity in shock-loaded solids. J. Appl. Phys. 50, 5196 (1979)CrossRefGoogle Scholar
  3. 3.
    Zuanetti, B., Wang, T., Prakash, V.: A compact fiber optics-based heterodyne combined normal and transverse displacement interferometer. Rev. Sci. Instrum. 88, 033108 (2017)CrossRefGoogle Scholar
  4. 4.
    Dolan, D.H.: Accuracy and precision in photonic Doppler velocimetry. Rev. Sci. Instrum. 81, 053905 (2010)CrossRefGoogle Scholar

Copyright information

© The Society for Experimental Mechanics, Inc. 2019

Authors and Affiliations

  • M. Mello
    • 1
    Email author
  • C. Kettenbeil
    • 1
  • M. Bischann
    • 1
  • Z. Lovinger
    • 1
  • G. Ravichandran
    • 1
  1. 1.California Institute of TechnologyPasadenaUSA

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