Pyrometric method for measuring emittances at high temperatures

Abstract

Thermophysical properties and corrosion characterization of low cost lithium containing nitrate salts produced in northern Chile for thermal energy storage AIP Conference Proceedings 1734, 050014 (2016) Abstract. In this work an alternative method for emittance determination based on pyrometric measurements is presented. The measurement procedure has been applied to AISI 310S steel samples in the Plataforma Solar de Almería vertical axis solar furnace SF5. The experimental results show that emittance increases with increasing temperature and decreases with increasing wavelength. This behaviour is in agreement with experimental results obtained by other authors. Analysis of tests has revealed a good repeatability (1%) and accuracy (< 2%) of this measurement procedure.

Double Modulation Pyrometry Applied to Radiatively Heated Surfaces With Dynamic Optical Properties

“…8 are consistent with previous studies. Specifically, the in-situ measurements agree well with the reflectance values determined before and the previously reported emittance values of about 0.95 [19] and 0.9-0.97 [20]. The observed wavelength dependence of ρ is in agreement with [19] (see Fig.…”

“…Specifically, the in-situ measurements agree well with the reflectance values determined before and the previously reported emittance values of about 0.95 [19] and 0.9-0.97 [20]. The observed wavelength dependence of ρ is in agreement with [19] (see Fig. 5 in [19]), in that ρ increases with wavelength (ρ ≈ 0.06, 0.08, 0.08, 0.1 for λ = 0.88, 1.0, 1.1, 1.2 µm).…”

“…The observed wavelength dependence of ρ is in agreement with [19] (see Fig. 5 in [19]), in that ρ increases with wavelength (ρ ≈ 0.06, 0.08, 0.08, 0.1 for λ = 0.88, 1.0, 1.1, 1.2 µm).…”

“…In addition, it is infered that ρ slightly decreases with increasing temperature: The transient surge observed with the on-line measured ρ (marker 'a') that appears at the beginning of each of the three heat-up curves at t = 16, 23, 30 min is an artifact caused by the fast increase of I 0 that masks the temperature dependent decrease of ρ [21,19].…”

“…Austenitic stainless steel 310, containing 25% Cr, 20% Ni, 0.6% Si, is corrosion resistant at high temperatures and deformation resistant due to the added carbon [19]. Thanks to these properties it is of interest for use in high temperature applications in excess of 1400 K under oxidizing atmospheres.…”