Study of shock-compression of halogen derivatives of methane

Gogulya, M. F.; Voskoboinikov, I. M.

doi:10.1007/bf00740426

Cited by 4 publications

(5 citation statements)

References 6 publications

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“…Calibration by self-emission of detonated nitromethane 4 or shocked quartz 26,34 requires either two separate experiments or two pyrometers for each unknown shock temperature data point. Use of high explosive emission as a reference requires special care to prevent super-compressed detonation with significant deviation from the equilibrium ChapmanJouguet pressure.…”

Section: Pulsed Laboratory Sourcesmentioning

confidence: 99%

“…[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.…”

Section: Introductionmentioning

confidence: 99%

“…There are only a few known exceptions to tungsten lamps for calibrating shock pyrometers. 1,4,6,23,26,[34][35][36] The difference between radiance and irradiance is clearly explained, for example, in Ref. 37,Ref.…”

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: Pulsed Laboratory Sourcesmentioning

confidence: 99%

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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“…Outside, it is surrounded by a multi-point detonation distributor, consisting of a set of plates (3) with a grid of tracks filled with plastic bonded explosive (PBX). The plates are connected with part (4) with a radial grid of tracks of equal length; detonation starts from the central point (5). The geometry of the tracks is clear from Figure 1: the detonation of the charge is excited progressively from bottom to top with a speed that is determined by the detonation velocity of PBX and by the angle of the outer track.…”

Section: Experimental Techniquementioning

confidence: 99%

“…[1,2] The internal energy, however, is not a thermodynamic potential with respect to the variables P and V, and in order to construct a closed thermodynamic system, it is necessary to additionally know the temperature dependence T = T (P, V). During the propagation of an SW, the temperature of the shock-compressed substance is measured together with other parameters of shock compression by well-known spectroscopic methods with an appropriate time resolution in the visible range for optically transparent media, [3][4][5][6][7][8] and in the near-Infrared radiation (IR) range spectrum for substances with a transparency window there. [9,10] Most condensed media, and primarily metals, are opaque so that the light emission from a shock-compressed matter is inaccessible for registration, and therefore, the temperature is usually calculated within the framework of existing models of EOS [11][12][13][14] or using ab initio calculations.…”

Section: Introductionmentioning

confidence: 99%

Measurement of dense plasma temperature of the shock‐compressed silicon

Nikolaev

Kulish

Dudin

et al. 2021

Contributions to Plasma Physics

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Measurements of the brightness temperature and compressibility of a dense silicon plasma formed by powerful shock waves (SWs) passing through a single‐crystal sample have been carried out. Plane SWs were created using an explosive technique: the traditional plane acceleration of a steel driver plate made it possible to obtain pressures in silicon up to 133 GPa, and the use of “Mach” cumulative generators realized the pressures up to 510 GPa. The shock Hugoniot of silicon was determined by the impedance matching with α‐quartz as the reference. The intensity of emitted thermal radiation was measured in the infrared range λ ∼ 1.5 μm, where silicon is optically transparent, and in the visible range of the spectrum. A significant (up to five times) understatement of the measured values of the brightness temperature in comparison with the values calculated by the equation of state was found. Taking into account the reflective properties of the SW in silicon does not lead to an agreement with the experiment. The estimates of relaxation processes behind the shock front suggest the presence of a zone of the establishment of ionization equilibrium with a width of ∼10 μm.

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Voskoboinikov

2003

Combustion, Explosion, and Shock Waves

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Study of shock-compression of halogen derivatives of methane

Cited by 4 publications

References 6 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

Measurement of dense plasma temperature of the shock‐compressed silicon

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