Shock temperature in calcite (CaCO3) at 95–160 GPa

Gupta, Satish C.; Love, S. G.; Ahrens, Thomas J.

doi:10.1016/s0012-821x(02)00685-4

Cited by 28 publications

(16 citation statements)

References 29 publications

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“…References 10 and 71 each use only a single sentence to outline calibration for spectral radiance using a coiled lamp as a cross-calibrated standard. Other papers on the subject only briefly mention using a coiled lamp, 29,31,40 with insufficient information to reproduce or understand the method.…”

Section: Known Methods Of Shock Pyrometer Calibration Using Coilmentioning

confidence: 99%

“…They suggest using these lamps only for direct illumination of photodetectors from a distance of 50 cm or more, with no imaging or relay optics. Nevertheless, several practical methods have been reported 5,9,10,40 for using such irradiance standards for pyrometer calibration.…”

Section: Continuous Laboratory Sourcesmentioning

confidence: 99%

“…One more experimental approach, reported by Yang 39 and outlined by Gupta et al, 40 combines the two previous methods ( Figure 3). The optical layout from target to fiber bundle was a slightly modified, non-imaging version of Bosloughs pyrometer.…”

Section: Instrument Descriptionmentioning

confidence: 99%

“…The radiative temperature data analysis of Lyzenga was done by simultaneous two-parameter nonlinear least-squares fitting for temperature and emissivity, 3,32,40,54,86 assuming equal response of the photodiodes during calibration (∼10 −2 s) and measurement (∼10 −8 -10 −7 s). 86 Due to the much weaker dependence of spectral radiance on emissivity than on temperature, this procedure often leads to spurious emissivities (e.g., greater than unity if not bounded) 33,40 and, in such cases, incorrect temperature values.…”

Section: A Nacl Test At 7500 Kmentioning

confidence: 99%

“…39,40 Using the original instrument design and calibration procedure, the data from the first two exploratory experiments showed high systematic errors in observed temperatures. Auxiliary post-shot radiometric tests revealed that optical power delivered to the photodetectors from the calibration light source was ∼2.5 times lower than expected, whereas no reduction of transmitted optical power was observed for a smaller light source that simulated the actual shock target.…”

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: Known Methods Of Shock Pyrometer Calibration Using Coilmentioning

confidence: 99%