Detection of melting in release for a shock-loaded tin sample using the reflectivity measurement method

Elias, P.; Chapron, P.; Laurent, B.

doi:10.1016/0030-4018(88)90042-9

Cited by 19 publications

(14 citation statements)

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“…It is evident that the major cause of the reflectivity changes for a free surface at melt, as seen by some workers [4], is not absorption changes in the melted material but rather largeangle scattering caused by roughening of the surface. Our measurements of the appearance of off-normal optical backscattering with increasing shock stress agree well with the measured loss of reflectivity in [4].…”

Section: Discussionmentioning

confidence: 85%

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Surface Specularity as an Indicator of Shock-Induced Solid-Liquid Phase Transitions in Tin

Stevens¹,

Lutz²,

Marshall³

et al. 2008

AIP Conference Proceedings

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Abstract. When highly polished metal surfaces melt upon release after shock loading, they exhibit features that suggest significant surface changes accompany the phase transition. The reflection of light from such surfaces changes from specular (pre-shock) to diffuse upon melting. Typical of this phenonmenon is the loss of signal light in velocity interferometer system for any reflector (VISAR) measurements, which usually occurs at pressures high enough to melt the free surface. Unlike many other potential material phase-sensitive diagnostics (e.g., reflectometery, conductivity), that show relatively small (1%-10%) changes, the specularity of reflection provides a more sensitive and definitive (>10x) indication of the solid-liquid phase transition. Data will be presented that support the hypothesis that specularity changes indicate melt in a way that can be measured easily and unambiguously.

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Section: Discussionmentioning

confidence: 85%

“…For example, velocity interferometer system for any reflector (VISAR) measurements fail [2,3], and the reflectivity of the shocked sample changes greatly [4]. In this paper, we report on experiments to understand these changes.…”

Section: Introductionmentioning

confidence: 99%