Automatic detection of material phase transitions from spectroscopic data

Hagqvist, PetterHögskolan Väst,Avd för automation och datateknik,PTW (författare)

Article number 6699504
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.

TEKNIK OCH TEKNOLOGIER Elektroteknik och elektronik Robotteknik och automation hsv//swe
ENGINEERING AND TECHNOLOGY Electrical Engineering, Electronic Engineering, Information Engineering Robotics hsv//eng
materialphase transitions
spectroscopic data
WIL
Work-integrated Learning
AIL
Manufacturing and materials engineering
Produktions- och materialteknik
Work Integrated Learning
Arbetsintegrerat lärande

Christiansson, Anna-Karin,1947-Högskolan Väst,Avd för automation och datateknik,PTW(Swepub:hv)takc (författare)
Högskolan VästAvd för automation och datateknik (creator_code:org_t)

Om ämnet

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