Temperature measurements of shock heated materials using multispectral pyrometry: Application to bismuth

Blanco, Eduardo; Mexmain, J.; Chapron, P.

doi:10.1007/s001930050156

Cited by 20 publications

(7 citation statements)

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“…Measurements in the far blue yield temperatures insensitive to uncertainty in the surface emissivity. [7,8] Measurements in the far red yield emissivity insensitive to uncertainty in the surface temperature.…”

Section: Methodsmentioning

confidence: 99%

Using multispectral imaging to measure temperature profiles and emissivity of large thermionic dispenser cathodes

Simmons

Fortgang

Holtkamp

2005

Review of Scientific Instruments

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The authors measured temperature, temperature uniformity, and emissivity of two large thermionic tungsten cathodes. This was necessary because their operating life is strongly affected by nonuniformities in temperature. The cathodes were self-heated 6.5 and 8-in. disks operating in a vacuum at about 1l00 °C. We measured the temperature of the cathodes by a combination of multispectral imaging using a conventional CCD camera and spot pyrometry using three spot pyrometers. We took images at the blue end of the spectrum (0.4 μm) to determine temperature accurate to 3% K. Spot pyrometers at the red end of the spectrum (to 1.8 μm) yielded emissivity with an uncertainty of 15%. We emphasized using data in the blue to determine the temperature and data in the red to determine emissivity. Our analysis displays data so that assumptions in determining temperature and emissivity are transparent. Because we obtained a linear relationship between camera counts and integrated exitance of a blackbody, we concluded that the camera was calibrated correctly.

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Section: Methodsmentioning

confidence: 99%

Using multispectral imaging to measure temperature profiles and emissivity of large thermionic dispenser cathodes

Simmons

Fortgang

Holtkamp

2005

Review of Scientific Instruments

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“…30 Pyrometry is often used for temperature measurement when emission is high and spectral emissivity is known or empirically fit. 30–36…”

Section: Theorymentioning

confidence: 99%

Quantitative Tradeoffs between Spatial, Temporal, and Thermometric Resolution of Nonresonant Raman Thermometry for Dynamic Experiments

et al. 2014

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The ratio of Stokes to anti-Stokes nonresonant spontaneous Raman can provide an in situ thermometer that is noncontact, independent of any material specific parameters or calibrations, can be multiplexed spatially with line imaging, and can be time resolved for dynamic measurements. However, spontaneous Raman cross sections are very small, and thermometric measurements are often limited by the amount of laser energy that can be applied without damaging the sample or changing its temperature appreciably. In this paper, we quantitatively detail the tradeoff space between spatial, temporal, and thermometric accuracy measurable with spontaneous Raman. Theoretical estimates are pinned to experimental measurements to form realistic expectations of the resolution tradeoffs appropriate to various experiments. We consider the effects of signal to noise, collection efficiency, laser heating, pulsed laser ablation, and blackbody emission as limiting factors, provide formulae to help choose optimal conditions and provide estimates relevant to planning experiments along with concrete examples for single-shot measurements.

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“…Researchers have used multi-color optical pyrometry to make high-speed measurements of temperatures in other high-energy physics applications such as explosives, shocked materials, and fireballs 13 – 18 . The recent designs reviewed by Ota et al 17 provide compelling examples of the strength of multi-color pyrometry for time-resolved nanosecond temperature measurements in dynamic environments.…”

Section: Introductionmentioning

confidence: 99%

Time-resolved nanosecond optical pyrometry of the vapor to plasma transitions in exploding bridgewires

Feagin

Heatwole

Rae

et al. 2021

Sci Rep

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Electrically exploded wires find uses throughout high-energy physics. For example, they are commonly used as high-temperature sources, X-ray generators, and in precision timing detonators. However, the detailed and complete physics that occurs is complex and still poorly understood. A full mechanistic description of these complex phenomena is beyond the scope of a single paper. Instead, we focus on the formation of metal vapor and its transition to plasma. This single transition is commonly assumed to comprise “bridge-burst”. We use a suite of diagnostics including a novel, fiber-based, high-speed, optical pyrometer to better characterize this transition. The primary finding from this project is that peak light output from an exploding wire does not temporally match the peak temperature. Additionally, it is found that peak light does not align with peak bridge-burst voltage and that the peak temperature is not voltage-dependent. These findings are non-intuitive and will allow for the correction of false assumptions previously made about this topic.

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Temperature measurements of shock heated materials using multispectral pyrometry: Application to bismuth

Cited by 20 publications

References 0 publications

Using multispectral imaging to measure temperature profiles and emissivity of large thermionic dispenser cathodes

Using multispectral imaging to measure temperature profiles and emissivity of large thermionic dispenser cathodes

Quantitative Tradeoffs between Spatial, Temporal, and Thermometric Resolution of Nonresonant Raman Thermometry for Dynamic Experiments

Time-resolved nanosecond optical pyrometry of the vapor to plasma transitions in exploding bridgewires

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