Wall temperature measurements using a thermal imaging camera with temperature-dependent emissivity corrections

McDaid, Chloe; Zhang, Yang

doi:10.1088/0957-0233/22/12/125503

Cited by 8 publications

(4 citation statements)

References 21 publications

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“…Melendez et al [16] presented a way to overcome the problem of low spatial resolution in a harsh environment by using an infrared camera to study the composite plates exposed to fire. McDaid et al [17] presented a methodology whereby the relationship between temperature and emissivity for fused quartz was used to correct the temperature values of a quartz impingement plate detected by an SC3000 thermal imaging camera.…”

Section: Measurement Science and Technologymentioning

confidence: 99%

An inverse method for flue gas shielded metal surface temperature measurement based on infrared radiation

Zhang

Wang

2016

Meas. Sci. Technol.

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The infrared temperature measurement technique has been applied in various fields, such as thermal efficiency analysis, environmental monitoring, industrial facility inspections, and remote temperature sensing. In the problem of infrared measurement of the metal surface temperature of superheater surfaces, the outer wall of the metal pipe is covered by radiative participating flue gas. This means that the traditional infrared measurement technique will lead to intolerable measurement errors due to the absorption and scattering of the flue gas. In this paper, an infrared measurement method for a metal surface in flue gas is investigated theoretically and experimentally. The spectral emissivity of the metal surface, and the spectral absorption and scattering coefficients of the radiative participating flue gas are retrieved simultaneously using an inverse method called quantum particle swarm optimization. Meanwhile, the detected radiation energy simulated using a forward simulation method (named the source multi-flux method) is set as the input of the retrieval. Then, the temperature of the metal surface detected by an infrared CCD camera is modified using the source multiflux method in combination with these retrieved physical properties. Finally, an infrared measurement system for metal surface temperature is built to assess the proposed method. Experimental results show that the modified temperature is closer to the true value than that of the direct measured temperature.

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Section: Measurement Science and Technologymentioning

confidence: 99%

An inverse method for flue gas shielded metal surface temperature measurement based on infrared radiation

Zhang

Wang

2016

Meas. Sci. Technol.

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“…Mcdaid [89] investigated the thermal inertia of a 10 mm thick steel plate and observed that at steady state conditions, the steel plate maintained its temperature. When the heat source was removed, the temperature changed by 1 0 C in approximately 20 seconds due to its high thermal inertia.…”

Section: Thermal Profilementioning

confidence: 99%

“…Thermal imaging has successfully found its place in research where non-intrusive and non-obstructive techniques are needed to study temperature and heattransfer based studies. McDaid[89], Lytle and Webb[90] have used thermal imaging to study heat transfer characteristics through thermal imaging[91][92][93]. Most studies investigated the non-impinged side of an object because thermal imaging systems failed to measure flame temperature accurately.…”

mentioning

confidence: 99%

Studies of the physical aspects of intumescence using advance diagnostics methods

Saeed

Huang

Zhang

2014

AIP Conference Proceedings

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This tf»es»s to protected by the Copyright, Designs and Patent* Act 1988. No reproduction is p«rroitt«d without consent of the author. It is also protected by the Creative Commons tic«nee allowing Attrtbutions-Non-commerciaJ-No derivatives. for eompicttofi by »»• Ptew* Jiwltart* If ttwp» ift any ftmbsufo rwtrletlMM on tMs have consented ta yew th«»t» facing made «MMM» without *. • I would first of all like to thank my supervisor, Prof. Yang Zhang, for his continued support and expertise throughout my PhD studies with regards to experimentation, writing and organisation. Without his assistance this would not have been possible. In addition, I would like to extend my deepest gratitude to my second supervisor, Dr Robert Woolley for his invaluable support, my colleagues in the Combustion and Flow Diagnostic research group; Hua

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“…The angular dependence of emissivity and infrared radiation were not tested in this work, but as mentioned in [132], between 30 o and 60 o there is a minimal discrepancy of less than 2%.…”

Section: Error Analysis Of Ir Measurementsmentioning

confidence: 96%

Experimental investigation of isothermal and reacting flow characteristics downstream of axisymmetric bluff body stabilizers under stratified or fully premixed inlet mixture conditions

Paterakis¹,

Πατεράκης²

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The current work describes an experimental investigation of isothermal and turbulent reacting flow field characteristics downstream of axisymmetric bluff body stabilizers under a variety of inlet mixture conditions. Fully premixed and stratified flames established downstream of this double cavity premixer/burner configuration were measured and assessed under lean and ultra-lean operating conditions. The aim of this thesis was to further comprehend the impact of stratifying the inlet fuelair mixture on the reacting wake characteristics for a range of practical stabilizers under a variety of inlet fuel-air settings. In the first part of this thesis, the isothermal mean and turbulent flow features downstream of a variety of axisymmetric baffles was initially examined. The effect of different shapes, (cone or disk), blockage ratios, (0.23 and 0.48), and rim thicknesses of these baffles was assessed. The variations of the recirculation zones, back flow velocity magnitude, annular jet ejection angles, wake development, entrainment efficiency, as well as several turbulent flow features were obtained, evaluated and appraised. Next, a comparative examination of the counterpart turbulent cold fuel-air mixing performance and characteristics of stratified against fully-premixed operation was performed for a wide range of baffle geometries and inlet mixture conditions. Scalar mixing and entrainment properties were investigated at the exit plane, at the bluff body annular shear layer, at the reattachment region and along the developing wake were investigated. These isothermal studies provided the necessary background information for clarifying the combustion properties and interpreting the trends in the counterpart turbulent reacting fields. Subsequently, for selected bluff bodies, flame structures and behavior for operation with a variety of reacting conditions were demonstrated. The effect of inlet fuel-air mixture settings, fuel type and bluff body geometry on wake development, flame shape, anchoring and structure, temperatures and combustion efficiencies, over lean and close to blow-off conditions, was presented and analyzed. For the obtained measurements infrared radiation, particle image velocimetry, laser doppler velocimetry, chemiluminescence imaging set-ups, together with Fouriertransform infrared spectroscopy, thermocouples and global emission analyzer instrumentation was employed. This helped to delineate a number of factors that affectcold flow fuel-air mixing, flame anchoring topologies, wake structure development and overall burner performance. The presented data will also significantly assist the validation of computational methodologies for combusting flows and the development of turbulence-chemistry interaction models.

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Wall temperature measurements using a thermal imaging camera with temperature-dependent emissivity corrections

Cited by 8 publications

References 21 publications

An inverse method for flue gas shielded metal surface temperature measurement based on infrared radiation

An inverse method for flue gas shielded metal surface temperature measurement based on infrared radiation

Studies of the physical aspects of intumescence using advance diagnostics methods

Experimental investigation of isothermal and reacting flow characteristics downstream of axisymmetric bluff body stabilizers under stratified or fully premixed inlet mixture conditions

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