Optics: measuring and testing – By dispersed light spectroscopy – With raman type light scattering
Patent
1983-12-16
1985-11-26
Evans, F. L.
Optics: measuring and testing
By dispersed light spectroscopy
With raman type light scattering
G01N 2165
Patent
active
045551766
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.
REFERENCES:
patent: 4398801 (1983-08-01), McWilliams
"Stimulated Brillouin Scattering in Shock-Compressed Fluids," Bloom et al., J. App. Phys., vol. 45, No. 3, Mar. 1974 p. 1200.
"Backward Stimulated Raman Scattering in Shock Compressed Benzene," Schmidt et al., Phys. Rev. Lett., vol. 50, No. 9, Feb. 28, 1983, p. 661.
"Simultaneous Multimode Pressure-Induced Frequency-Shift Measurements in Shock Compressed Organic Liquid Mixtures by Use of Reflected Broadband Coherent Anti-Stokes Raman Scattering," Moore et al., Phys. Rev. Lett., vol. 50, No. 22, May 30, 1983, p. 1819.
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Los Alamos Unclassified Report 83-1024, Moore et al., Proceedings of the Los Alamos Conference on Optics '83, released 4/7/83.
Los Alamos Unclassified Report 83-351, Schmidt et al., presented at Ninth International Colloquium on Dynamics of Explosions and Reactive Systems, Poitier, France, Jul. 4-8, 1983.
Los Alamos Unclassified Report 83-901, Schmidt et al., presented at Workshop on Shock-Compressed Chemistry in Materials Synthesis and Processing, Seattle, WA. Mar. 28-29, 1983.
Los Alamos Unclassified Report 83-1584, Schmidt et al., presented at Conference on Shock-Waves in Condensed Matter, Santa Fe, NM, Jul. 18-21, 1983.
Los Alamos Unclassified Report 83-1854, Moore et al., presented at IX AIRADT Conference, Albany, NY, Jul. 25-29, 1983.
Los Alamos Unclassified Report 83-2847, Schmidt et al., presented at CEA/Los Alamos High Explosives and Detonation Physics Conference, Paris, France, Oct. 3-6, 1983.
Moore David S.
Schmidt Stephen C.
Eklund William A.
Evans F. L.
Gaetjens Paul D.
Harringa Joel L.
Hightower Judson R.
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