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Heterodyne diffracted beam photonic Doppler velocimeter (DPDV) for measurement of transverse and normal particle velocities in pressure-shear plate impact experiments

Mello, Michael and Kettenbeil, Christian and Bischann, Moriah and Ravichandran, Guruswami (2017) Heterodyne diffracted beam photonic Doppler velocimeter (DPDV) for measurement of transverse and normal particle velocities in pressure-shear plate impact experiments. In: Shock Compression of Condensed Matter - 2017. AIP conference proceedings. No.1979. American Institute of Physics , Melville, NY, Art. No. 160017. ISBN 978-0-7354-1693-2. http://resolver.caltech.edu/CaltechAUTHORS:20180705-135444147

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Abstract

Pressure-shear plate impact (PSPI) experiments have traditionally relied on free space beam interferometers such as the transverse displacement interferometer (TDI) and normal displacement interferometer (NDI) or normal velocity interferometer (NVI), to measure transverse and normal velocities at the rear surface of the target plate [1]. Alternative interferometer schemes feature a dual beam VISAR arrangement [2] and a recently developed all fiber-optic TDI-NDI/PDV configuration [3]. Here, we present a heterodyne diffracted beam PDV (DPDV) which interferes a pair of symmetrically diffracted 1st order beams produced by a thin, specular, metallic grating deposited on the rear surface of the target plate. Each beam is collected by a fiber-optic probe and directed to interfere with a reference beam of a slightly increased wavelength to create an upshifted carrier signal frequency at zero particle velocity. Signal frequencies are extracted from the two fringe records using a moving-window DFT algorithm and then linearly combined in a post processing step to decouple the normal and transverse velocities. The 0th order beam can also be interfered in a heterodyne PDV to obtain an additional independent measurement of the normal particle velocity [4]. An overview of the DPDV configuration is presented along with a derivation of the interferometer sensitivities to transverse and normal particle velocities. Results from a normal impact experiment conducted on y-cut α-quartz are presented as experimental validation.


Item Type:Book Section
Related URLs:
URLURL TypeDescription
https://doi.org/10.1063/1.5045016DOIArticle
ORCID:
AuthorORCID
Bischann, Moriah0000-0002-6674-5158
Additional Information:© 2018 AIP Publishing LLC. Published Online: 03 July 2018. The authors are grateful for support from the Office of Naval Research (Award No. N00014-16-1-2839) for the development of the PSPI capability at high pressures and the Air Force Office of Scientific Research (Award No. FA9550-12-1-0091) for the development of the heterodyne diffracted beam photonic Doppler velocimeter (DPDV) system.
Group:GALCIT
Funders:
Funding AgencyGrant Number
Office of Naval Research (ONR)N00014-16-1-2839
Air Force Office of Scientific Research (AFOSR)FA9550-12-1-0091
Record Number:CaltechAUTHORS:20180705-135444147
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20180705-135444147
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:87558
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:06 Jul 2018 16:04
Last Modified:02 Aug 2018 17:22

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