Apparatus for the measurement of the optical constants and thermal radiative properties of pure liquid metals from 0. 4 to 10 [mu]m

Journal Article · Thu Jul 01 04:00:00 EDT 1993 · Review of Scientific Instruments; (United States)

DOI:https://doi.org/10.1063/1.1143984· OSTI ID:6449401

Havstad, M A; McLean, W II ^[1]; Self, S A ^[2]

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1. Lawrence Livermore National Laboratory, P.O. Box 808, L-470, Livermore, California 94550 (United States)
2. Stanford University, Department of Mechanical Engineering, Stanford, California 94305-3032 (United States)

Measurements of the optical constants and thermal radiative properties of high-temperature solid tungsten and molten aluminum have been made using a new instrument that includes two independent optical systems and surface control and analysis capability. The two optical systems, one for measuring the complex index of refraction by ellipsometry, the other for measuring the normal spectral emissivity by direct comparison to an integral blackbody cavity, operate over the wavelength range 0.4--10 [mu]m with sample temperatures between 940 and 1630 K. The surface science capabilities of the instrument permit the preparation of high-purity samples of known composition [ital in] [ital situ]. The apparatus includes two 5-keV argon-ion sputter guns, an ultrahigh vacuum pumping system, and an Auger spectrometer. The two sputter guns allow surface cleaning to occur while optical measurements are being made, or while Auger spectroscopy is determining the surface composition of solid or liquid samples. The ellipsometric optical system uses a novel radiation source (a carbon composite element), refractive optics (calcium fluoride), interference filters for spectral selection, and both calcite and wire grid polarizers to cover the extended wavelength range. The system for measuring the normal spectral emissivity uses reflective optics and an integral blackbody cavity that is located in the wall of the crucible holding the liquid sample. The use of two measurement techniques gives independent determinations of the normal spectral emissivity and thus allows reliable estimation of experimental errors.

• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 6449401
• Journal Information: Review of Scientific Instruments; (United States), Journal Name: Review of Scientific Instruments; (United States) Vol. 64:7; ISSN 0034-6748; ISSN RSINAK
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
ALUMINIUM
ELEMENTS
ELLIPSOMETRY
EMISSIVITY
FLUIDS
LIQUID METALS
LIQUIDS
MEASURING METHODS
METALS
OPTICAL PROPERTIES
PHYSICAL PROPERTIES
REFRACTIVE INDEX
SURFACE PROPERTIES
TEMPERATURE RANGE
TEMPERATURE RANGE 0400-1000 K
TEMPERATURE RANGE 1000-4000 K
TRANSITION ELEMENTS
TUNGSTEN