Multiwavelength infrared pyrometry: optimization and computer simulations

Application of multispectral radiation thermometry in temperature measurement of thermal barrier coated surfaces

“…In order to use this technique to determine surface temperature of a target, emissivity model, appropriate for the target surface has to be identified. Several mathematical models of spectral emissivity which can be employed in this technique have been proposed [10,[19][20][21][22][23][24]29] and mainly tested for use in metallic surfaces with minimal consideration of the influence of ambient radiation. In this work, 10 emissivity models listed below were tested for possible application in ceramic thermal barrier coatings of different thickness.…”

Criteria system of formation of spectral channels of multichannel radiation thermometer

“…Інформація про значення температури досліджува ного об'єкта надходить у вигляді інтегрального потоку Для реалізації багатоканального термометра випро мінення необхідно розробити вимоги до формування спектральних каналів. Спроба цього була зроблена в ро боті [7,8]. Але в роботі не висвітлені питання мож ливості взаємного розташування спектральних смуг та одночасної реалізації декількох методів термометрії за випрпроміненням.…”

Analogous of Wien's law for the optimal wavelengths selection in bi-spectral method used for temperature measurement of surfaces exhibiting non-uniform emissivity, and general methodology for the multi-spectral method

“…(T,X)). Note that when Nf =3, we take the three shortest wavelengths among the four used to carry out the tables, because it can be shown that the results are better for the shortest wavelengths [5,6,9]. Similarly, TNL.Tabc (respectively TNL.Tab), means that we use (10) and the unknown parameters are (T,a,b,c) (resp.…”

“…The measurement difficulties are numerous, such as taking into account the reflection on the sample, or spatial and temporal variations of the emissivity of the material, making it non-uniform over the sample surface, especially at high temperature where significant oxidation phenomena can occur. One solution is to make a measurement by the multi-spectral method [2][3][4][5][6][7][8][9], of which a state-of-theart has been made by [4,8]. Even if the idea is interesting, its implementation is tricky because of the difficulty to choose the adapted wavelengths λi.…”