Single-crystal sapphire tubes as economical probes for optical pyrometry in harsh environments

Růžička, Jakub; Houžvička, J.; Bok, J.; Praus, Petr; Mojzeš, Peter

doi:10.1364/ao.50.006599

Cited by 7 publications

(3 citation statements)

References 13 publications

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“…This minimizes the need for cleaning the lenses and windows and also reduces unwanted background radiation [ 18 ]. In many cases, closed-end target tubes made of different materials can be used to eliminate the influence of unknown or changing surface emissivity and atmosphere interference [ 24 , 25 , 26 ]. These are typically used on liquids or in other processes where the inside temperature of the target tube sufficiently represents the process temperature.…”

Section: Radiation Thermometry Working Principlesmentioning

confidence: 99%

A Review of Thermal Spectral Imaging Methods for Monitoring High-Temperature Molten Material Streams

Grujić

2023

Sensors

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Real-time closed-loop control of metallurgical processes is still in its infancy, mostly based on simple models and limited sensor data and challenged by extreme temperature and harsh process conditions. Contact-free thermal imaging-based measurement approaches thus appear to be particularly suitable for process monitoring. With the potential to generate vast amounts of accurate data in real time and combined with artificial intelligence methods to enable real-time analysis and integration of expert knowledge, thermal spectral imaging is identified as a promising method offering more robust and accurate identification of key parameters, such as surface temperature, morphology, composition, and flow rate.

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Section: Radiation Thermometry Working Principlesmentioning

confidence: 99%

A Review of Thermal Spectral Imaging Methods for Monitoring High-Temperature Molten Material Streams

Grujić

2023

Sensors

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“…This minimizes the need for cleaning the lenses and windows and also reduces unwanted background radiation [15]. In many cases, closed-end target tubes made of different materials can be used to eliminate the influence of unknown or changing surface emissivity and atmosphere interference [21], [22], [23]. These are typically used on liquids or in other processes where the inside temperature of the target tube sufficiently represents the process temperature.…”

Section: Surroundings Interference and Surface Emissivity Effectsmentioning

confidence: 99%

A Review of Thermal Spectral Imaging Methods for Monitoring High-temperature Molten Material Streams

Grujić¹

2022

Preprint

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Real-time closed-loop control of metallurgical processes is still in its infancy, mostly based on simple models and limited sensor data, challenged by extreme temperature, harsh process conditions. Contact-free thermal imaging-based measurement approaches thus appear to be particularly suitable for process monitoring. With the potential to generate vast amounts of accurate data in real-time, combined with artificial intelligence methods to enable real-time analysis and integration of expert knowledge, thermal spectral imaging is identified as a promising method offering more robust and accurate identification of key parameters, such as surface temperature, morphology, composition and flow rate.

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“…Růžička et al [14] have previously described a modification of the light pipe based probe. Rather than just guiding light from an object of interest a fixed object made from tungsten is placed inside a hollow tube made from single crystal sapphire.…”

Section: Introductionmentioning

confidence: 99%

An investigation into a calibration scheme for a light pipe based temperature probe

Olsen

Mathisen

Simonsen

2018

Meas. Sci. Technol.

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We propose a scheme to ensure traceable calibrations of light pipe based temperature probes. We investigate experimentally and theoretically the properties of a device consisting of a sapphire tube with a tungsten filament at the bottom, filled with an inert gas and sealed to avoid contamination of the filament. The device is used as a contact probe, where the temperature is deduced based on detection and quantification of the Planckian radiation from the filament. The Sakuma–Hattori equation is used to approximate the Planck radiation as a function of temperature, and its parameters are fitted using a small number of calibration points. The impact of a small, temperature dependent emissivity on both the calibration and the interpolation errors is explored, and we find that a dual-band detection scheme is required to reduce the sensitivity to variation in the use conditions.

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Single-crystal sapphire tubes as economical probes for optical pyrometry in harsh environments

Cited by 7 publications

References 13 publications

A Review of Thermal Spectral Imaging Methods for Monitoring High-Temperature Molten Material Streams

A Review of Thermal Spectral Imaging Methods for Monitoring High-Temperature Molten Material Streams

A Review of Thermal Spectral Imaging Methods for Monitoring High-temperature Molten Material Streams

An investigation into a calibration scheme for a light pipe based temperature probe

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