Experimental study of the relationships between the spectral emissivity of brass and the temperature in the oxidizing environment |
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| Institution: | 1. College of Physics and Electronic Engineering, Henan Normal University, Xinxiang 453007, China;2. Wuhan Dikai Optoelectronics Technology Co. Ltd., Wuhan 430074, China;1. Advanced Communication Engineering Centre (ACE), School of Computer and Communication Engineering, Universiti Malaysia Perlis, Kangar, 01000, Perlis, Malaysia;2. Faculty of Mechanical Engineering, Universiti Malaysia Pahang, Pekan, 26600, Malaysia;3. School of Materials Engineering, Universiti Malaysia Perlis, Kangar, 02600, Perlis, Malaysia;4. Nanotechnology Research Lab, Department of Physics, Kongunadu Arts and Science College, G-N Mills, Coimbatore, 641 029, Tamil Nadu, India;5. Electronics and Communication Engineering, Christ the King Engineering College, Coimbatore, 641 104, Tamil Nadu, India;2. University of Copenhagen, Copenhagen, Denmark;3. Department of Urology, Rigshospitalet, Copenhagen, Denmark;4. Department of Urology, University Hospital Zealand, Roskilde, Denmark;1. CICECO – Aveiro Institute of Materials, Department of Materials and Ceramic Engineering, University of Aveiro, 3810-193 Aveiro, Portugal;2. i3N, Department of Physics, University of Aveiro, 3810-193 Aveiro, Portugal |
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| Abstract: | Effect of surface oxidization on the spectral emissivity of brass is studied over the temperature range from 800 to 1070 K at the wavelength of 1.5 μm. The temperature of brass surface is measured by averaging the two R-type platinum–rhodium thermocouples. The radiant energy emitted by the brass surface is received by an InGaAs photodiode detector. Two kinds of relationships between the spectral emissivity and the temperature are investigated in the oxidizing environment at the elevated temperature. One is the variation of spectral emissivity with the heating-duration time at the given temperature. The other is the variation of spectral emissivity with the temperature at the given heating-duration time. The interference effect of radiation coming from the brass surface and coming from the oxidization film is discussed when the oxidation film on the surface is grown. The resonant structures of spectral emissivity are observed during the whole heating period, in particular at the early stage of heating duration. The analytic formula of spectral emissivity versus the temperature is derived at the heating-duration time of 30, 60, 90, 120, 150, 180, 210, 240, 270 and 300 min, respectively. The conclusion is obtained that coefficients of analytic expressions between the spectral emissivity and the temperature are different from each other for the experimental results obtained at the different heating-duration time, though the polynomial functional form is suitable to fit all the measurements obtained in the present work. |
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| Keywords: | Surface oxidation Spectral emissivity Heating-duration time Temperature measurement by radiation Brass |
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