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Träfflista för sökning "(WFRF:(Christiansson Anna Karin 1947 )) srt2:(2010-2014) srt2:(2013)"

Sökning: (WFRF:(Christiansson Anna Karin 1947 )) srt2:(2010-2014) > (2013)

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1.
  • Hagqvist, Petter, et al. (författare)
  • Automatic detection of material phase transitions from spectroscopic data
  • 2013
  • Ingår i: Proceedings of the IECON 2013. - : IEEE. - 9781479902231 ; , s. 2384-2389
  • Konferensbidrag (refereegranskat)abstract
    • When using a temperaturemeasurementmethod which utilizes spectral information for measuring the temperature of varying emissivity measurands, there is a need for a temperature reference at some point in time. In this work, such a reference is created from the spectral radiance data already used by the temperature measurement method. A method of using knowledge of the measurand material's phase transitions and spectral radiance data as a temperature reference is presented. Through automatical identification of phase transitions from radiance spectra employing signal processing, the temperature is known at a certain instance in time, just like required by the temperature measurement method. Three methods for automatic identification of material phase transitions from spectroscopic data are examined and evaluated. The methods are, based on derivatives, steady-state identification and cross correlation respectively. They are introduced and evaluated using experimental data collected from a solidifying copper sample. All methods proved to identify the phase transitions correctly. The addition of automatic phase transition identification supplements the existing temperature measurement method such that it becomes a stand alone, reference free method for measuring the true absolute temperature of a measurand with varying emissivity.
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2.
  • Hagqvist, Petter, 1986-, et al. (författare)
  • Emissivity estimation for high temperature radiation pyrometry on Ti–6Al–4V
  • 2013
  • Ingår i: Measurement. - : Elsevier BV. - 0263-2241 .- 1873-412X. ; 46:2, s. 871-880
  • Tidskriftsartikel (refereegranskat)abstract
    • The paper demonstrates a versatile procedure suitable for industrial implementation of temperature measurement on a hot titanium alloy. The driving force has been the need for an accurate temperature measurement during additive manufacturing using laser welding technology where Ti–6Al–4V-wire is melted. The challenges consider both industrial constraints and the varying emissivity of the surface. Measurements makes use of a narrow bandwidth spot radiation pyrometer and a calibration procedure for estimation of the surface temperature through spectral emissivity estimation. The theoretical results are validated through experiments. A number of difficulties in radiation temperature measurements for metals with varying surface properties are discussed; especially the case of surface oxidation. The uncertainty in temperature reading due to the uncertainty in the emissivity estimate is established along with a model that qualitatively describes surface oxidation. The procedure is expected to be useful for several manufacturing applications where it is important to control high temperatures.
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Christiansson, Anna- ... (2)
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Hagqvist, Petter (1)
Hagqvist, Petter, 19 ... (1)
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