Characterisation and laboratory investigation of a new ultraviolet multi-wavelength measuring system for high-temperature applications

Battuello, M.; Girard, F.

doi:10.1016/j.measurement.2016.03.024

Cited by 7 publications

(3 citation statements)

References 5 publications

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“…using range of 0.35-0.95 µm in place of 0.65-0.95 µm, being the error reduction more pronounced as m increased. Furthermore, Battuello and Girard [109] developed a UV multiwavelength pyrometer for hightemperature applications (above 1300 • C), operating in the spectral range of 0.35-0.95 µm. By insert ing optical windows of unknown transmissivities between the pyrometer and the target, the pyrometer was used to meas ure the temper ature of a black body at 1300 • C, resulting in temper ature measurement errors under 1%.…”

Section: Multi-wavelength Pyrometrymentioning

confidence: 99%

Multi-spectral pyrometry—a review

Araújo¹

2017

Meas. Sci. Technol.

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In pyrometry measurements, the unknown target emissivity is a critical source of uncertainty, especially when the emissivity is low. Aiming to overcome this problem, various multi-spectral pyrometry systems and processing techniques have been proposed in the literature. Basically, all multi-spectral systems are based on the same principle: the radiation emitted by the target is measured at different channels having different spectral characteristics, and the emissivity is modelled as a function of wavelength with adjustable parameters to be obtained empirically, resulting in a system of equations whose solution is the target temperature and the parameters of the emissivity function. The present work reviews the most important multi-spectral developments. Concerning the spectral width of the measurement channels, multi-spectral systems are divided into multi-wavelength (monochromatic channels) and multi-band (wide-band channels) systems. Regarding the number of unknowns and equations (one equation per channel), pyrometry systems can either be determined (same number of unknowns and equations, having a unique solution) or overdetermined (more equations than unknowns, to be solved by least-squares). Generally, higher-order multi-spectral systems are overdetermined, since the uncertainty of the solutions obtained from determined systems increases as the number of channels increases, so that determined systems normally have less than four channels. In terms of the spectral characteristics of the measurement channels, narrow bands, far apart from each other and shifted towards lower wavelengths, seem to provide more accurate solutions. Many processing techniques have been proposed, but they strongly rely on the relationship between emissivity and wavelength, which is, in turn, strongly dependent on the characteristics of a particular target. Several accurate temperature and/or emissivity results have been reported, but no universally accepted multi-spectral technique has yet been developed.

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Section: Multi-wavelength Pyrometrymentioning

confidence: 99%

Multi-spectral pyrometry—a review

Araújo¹

2017

Meas. Sci. Technol.

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“…For the temperature measurement, the estimated measurement combined standard uncertainty is 5.5 °C (k=2), while for the emissivity measurement the estimated standard uncertainty is 0.072 (k=2). Further details of the MWT setup and the measurement comparison performed can be found in [7].…”

Section: Uv-multiwavelength Technique For Simultaneous Temperature An...mentioning

confidence: 99%

The European project on high temperature measurement solutions in industry (HiTeMS) – A summary of achievements

et al. 2016

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“…MWT uses spectral data corresponding to many wavelengths to measure the temperature; this method has the advantage of providing more information than two-color thermometry and is commonly used for measuring the temperature and emissivity of high-temperature objects simultaneously. Girard et al , extended the operating wavelength range of multi-wavelength pyrometers to the ultraviolet (UV) region and developed a UV multi-wavelength pyrometer. In an experiment of measuring the blackbody source at 1300 °C, the relative error of MWT was less than 1%.…”

Section: Introductionmentioning

confidence: 99%

Online Measurement of the Flame Temperature and Emissivity during Biomass Volatile Combustion Using Spectral Thermometry and Image Thermometry

Yan

Huang

et al. 2019

Energy Fuels

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In this paper, a method for the simultaneous measurement of the flame temperature and emissivity using spectral thermometry and image thermometry was proposed; experiments were conducted using a laboratory furnace burning solid particle fuel derived from biomass. First, a non-gray emissivity model with a third-order polynomial function was established, and the accuracy of the temperature estimates obtained from the gray emissivity model, the non-gray emissivity model, and the Hottel and Broughton emissivity model was determined. The results showed that the proposed non-gray emissivity model had the highest accuracy and the maximum relative error compared to the thermocouple measurements was less than 1.5%. Second, the spectral emissivity obtained from the spectral thermometry was used to correct the image pyrometer data. The two-dimensional distributions of the flame temperature and emissivity are measured after correction using image pyrometry. It showed that the results of the spectral thermometry and image thermometry were highly consistent with the thermocouple measurements and the maximum relative errors were 1.5 and 3.2%, respectively. Finally, the effects of the equivalent ratio on the temperature and spectral emissivity were investigated. The results showed that the maximum temperature of the volatile combustion flame was 1000–1250 K and the maximum emissivity of the flame ranged from 0.05 to 0.25 in the equivalent ratio range of 0.91–0.71. The maximum temperature and emissivity decreased as the equivalent ratio decreased.

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Characterisation and laboratory investigation of a new ultraviolet multi-wavelength measuring system for high-temperature applications

Cited by 7 publications

References 5 publications

Multi-spectral pyrometry—a review

Multi-spectral pyrometry—a review

The European project on high temperature measurement solutions in industry (HiTeMS) – A summary of achievements

Online Measurement of the Flame Temperature and Emissivity during Biomass Volatile Combustion Using Spectral Thermometry and Image Thermometry

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