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Pyalling, A. A.; Gryaznov, V. K.; Kvitov, S. V.; Nikolaev, D. N.; Ternovoǐ, V. Ya.; Filimonov, A. S.; Фортов, В. Е.; Hoffmann, D.; Stöckl, C.; Dornik, M.

doi:10.1023/a:1022671813209

Cited by 8 publications

(10 citation statements)

References 2 publications

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“…[1][2][3][4][5] Time-resolved, discrete multi-wavelength radiation pyrometry has been for several decades the most robust, reliable, and widely used tool for these studies. [6][7][8][9][10][11][12][13][14] As with most other spectroradiometric techniques, shock temperature pyrometry requires standard sources of light [16][17][18][19] to determine calibration factors for each pyrometer channel. Such factors are necessary to convert recorded radiance histories into equilibrium thermodynamic temperature of the material in the shockcompressed state.…”

Section: Introductionmentioning

confidence: 99%

“…The vast majority of these measurements employed currently discontinued tungsten ribbon standards of spectral radiance. 3,11,14,20,27,28 Less frequently, since 1983, 32,33 coiled tungsten halogen standards of spectral irradiance 5,9,10,29-31 have been used. There are only a few known exceptions to tungsten lamps for calibrating shock pyrometers.…”

Section: Introductionmentioning

confidence: 99%

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Contributed Review: Absolute spectral radiance calibration of fiber-optic shock-temperature pyrometers using a coiled-coil irradiance standard lamp

Fat’yanov

Asimow

2015

Review of Scientific Instruments

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Development of a fast fiber-optic two-color pyrometer for the temperature measurement of surfaces with varying emissivities Rev. Sci. Instrum. 72, 3366 (2001); 10.1063/1.1384448 This article is copyrighted as indicated in the article. Reuse of AIP content is subject to the terms at: http://scitationnew. We describe an accurate and precise calibration procedure for multichannel optical pyrometers such as the 6-channel, 3-ns temporal resolution instrument used in the Caltech experimental geophysics laboratory. We begin with a review of calibration sources for shock temperatures in the 3000-30 000 K range. High-power, coiled tungsten halogen standards of spectral irradiance appear to be the only practical alternative to NIST-traceable tungsten ribbon lamps, which are no longer available with large enough calibrated area. However, non-uniform radiance complicates the use of such coiled lamps for reliable and reproducible calibration of pyrometers that employ imaging or relay optics. Careful analysis of documented methods of shock pyrometer calibration to coiled irradiance standard lamps shows that only one technique, not directly applicable in our case, is free of major radiometric errors. We provide a detailed description of the modified Caltech pyrometer instrument and a procedure for its absolute spectral radiance calibration, accurate to ±5%. We employ a designated central area of a 0.7× demagnified image of a coiled-coil tungsten halogen lamp filament, cross-calibrated against a NIST-traceable tungsten ribbon lamp. We give the results of the cross-calibration along with descriptions of the optical arrangement, data acquisition, and processing. We describe a procedure to characterize the difference between the static and dynamic response of amplified photodetectors, allowing time-dependent photodiode correction factors for spectral radiance histories from shock experiments. We validate correct operation of the modified Caltech pyrometer with actual shock temperature experiments on single-crystal NaCl and MgO and obtain very good agreement with the literature data for these substances. We conclude with a summary of the most essential requirements for error-free calibration of a fiber-optic shock-temperature pyrometer using a high-power coiled tungsten halogen irradiance standard lamp. C 2015 AIP Publishing LLC.[http://dx

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Contributed Review: Absolute spectral radiance calibration of fiber-optic shock-temperature pyrometers using a coiled-coil irradiance standard lamp

Fat’yanov

Asimow

2015

Review of Scientific Instruments

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“…This abnormal growth of temperature needs further explanation. The temperature observed in the experiment is the temperature of the metal-helium boundary [12]. The temperature of molybdenum decreases with a decrease of P S , and the temperature of the shocked helium is lower then the temperature of the molybdenum.…”

Section: Resultsmentioning

confidence: 83%

Investigation of Near-Critical States of Molybdenum by Method of Isentropic Expansion

2005

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In this work release isentropes of shocked porous molybdenum were investigated. Samples with an initial porosity m = ρ 0 /ρ = 1.4 and 3.1 were studied to achieve near-critical entropy states of metal after shock compression. Compressed samples were expanded into helium with different initial pressures. The brightness temperature of the metal and the helium shock wave velocity were measured with a fast multichannel pyrometer. The helium shock wave velocity was used to determine the final pressure (P S ) of expansion of the metal and the velocity of metal expansion (W S ). Location of peculiarities on the P S -W S and P S -T P curves of the isentropes gives the location of their entrance into the two-phase region. Estimation of the molybdenum critical temperature and pressure was carried out on the basis of the experimental data.

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“…Nevertheless, during recent years new measurements have appeared, allowing penetration of this region for metals. Shock wave measurements give information about the thermodynamic parameters . The densities reached in this type of measurements are usually higher than the corresponding critical density for the considered metal.…”

Section: Introductionmentioning

confidence: 99%

The thermophysical properties of low‐temperature Pb plasma

Apfelbaum

2019

Contributions to Plasma Physics

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The thermophysical properties of low‐temperature Pb plasma are calculated at temperatures 10–100 kK and densities below 0.2 of the solid‐state value. The thermodynamic values (pressure and internal energy) and transport coefficients (electrical conductivity, thermal conductivity, and thermal power) are considered. The plasma composition and thermodynamic parameters are obtained within the chemical approach, namely by means of the solution of the corresponding system of the coupled mass action law equations. Atom ionization up to +4 is taken into consideration. The electronic transport coefficients are calculated within the relaxation time approximation. The results obtained by means of the present model are compared with the available data of other models and experiments.

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Cited by 8 publications

References 2 publications

Contributed Review: Absolute spectral radiance calibration of fiber-optic shock-temperature pyrometers using a coiled-coil irradiance standard lamp

Contributed Review: Absolute spectral radiance calibration of fiber-optic shock-temperature pyrometers using a coiled-coil irradiance standard lamp

Investigation of Near-Critical States of Molybdenum by Method of Isentropic Expansion

The thermophysical properties of low‐temperature Pb plasma

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