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Title: Method and apparatus for determining pressure-induced frequency-shifts in shock-compressed materials

Abstract

A method and an apparatus for conducting coherent anti-Stokes Raman scattering spectroscopy in shock-compressed materials are disclosed. The apparatus includes a sample vessel having an optically transparent wall and an opposing optically reflective wall. Two coherent laser beams, a pump beam and a broadband Stokes beam, are directed through the window and focused on a portion of the sample. In the preferred embodiment, a projectile is fired from a high-pressure gas gun to impact the outside of the reflective wall, generating a planar shock wave which travels through the sample toward the window. The pump and Stokes beams result in the emission from the shock-compressed sample of a coherent anti-Stokes beam, which is emitted toward the approaching reflective wall of the vessel and reflected back through the window. The anti-Stokes beam is folded into a spectrometer for frequency analysis. The results of such analysis are useful for determining chemical and physical phenomena which occur during the shock-compression of the sample.

Inventors:
;
Publication Date:
OSTI Identifier:
5675734
Patent Number(s):
US 4555176
Assignee:
The United States of America as represented by the United States Department of Energy IFI; EDB-86-103984
Resource Type:
Patent
Resource Relation:
Patent File Date: Filed date 16 Dec 1983; Other Information: PAT-APPL-562150
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION; LIQUIDS; IMPACT SHOCK; RAMAN SPECTROSCOPY; SPECTROMETERS; DESIGN; COMPRESSION; DYE LASERS; FREQUENCY ANALYSIS; GUNS; NEODYMIUM LASERS; PROJECTILES; SHOCK WAVES; FLUIDS; LASER SPECTROSCOPY; LASERS; LIQUID LASERS; MEASURING INSTRUMENTS; SOLID STATE LASERS; SPECTROSCOPY; 440300* - Miscellaneous Instruments- (-1989)

Citation Formats

Moore, D. S., and Schmidt, S. C. Method and apparatus for determining pressure-induced frequency-shifts in shock-compressed materials. United States: N. p., 1985. Web.
Moore, D. S., & Schmidt, S. C. Method and apparatus for determining pressure-induced frequency-shifts in shock-compressed materials. United States.
Moore, D. S., and Schmidt, S. C. Tue . "Method and apparatus for determining pressure-induced frequency-shifts in shock-compressed materials". United States.
@article{osti_5675734,
title = {Method and apparatus for determining pressure-induced frequency-shifts in shock-compressed materials},
author = {Moore, D. S. and Schmidt, S. C.},
abstractNote = {A method and an apparatus for conducting coherent anti-Stokes Raman scattering spectroscopy in shock-compressed materials are disclosed. The apparatus includes a sample vessel having an optically transparent wall and an opposing optically reflective wall. Two coherent laser beams, a pump beam and a broadband Stokes beam, are directed through the window and focused on a portion of the sample. In the preferred embodiment, a projectile is fired from a high-pressure gas gun to impact the outside of the reflective wall, generating a planar shock wave which travels through the sample toward the window. The pump and Stokes beams result in the emission from the shock-compressed sample of a coherent anti-Stokes beam, which is emitted toward the approaching reflective wall of the vessel and reflected back through the window. The anti-Stokes beam is folded into a spectrometer for frequency analysis. The results of such analysis are useful for determining chemical and physical phenomena which occur during the shock-compression of the sample.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1985},
month = {11}
}