Spectral radiation property investigation of iron based oxide micro-particles

The radiative property of metallic oxide during solar hydrogen production process varies with reaction temperature, wavelength and component and it plays a important role during energy transfer process. In order to acquire the spectral radiative property of metallic oxide during 0.3-1.2 μm, an experimental system is built. Some experiments are applied to validate the measuring accuracy of this system. Then the transmittance of NiFe₂O₄ particles are obtained based on KBr pellet method. The experimental results show that the system has a good performance on radiative measurement. The transmittance of sample increases with increase of wavelength and decreases with increase of sample thickness. There are many localized fluctuations are also observed in all sample types, which suggesting possible sharp peaks in the absorption coefficient of iron based oxide at these wavelengths. The above investigation will provide a base for a detailed radiative transfer analysis to quantify the radiative properties, like extinction coefficient, scattering albedo and scattering phase function, etc., and provide the basis for developing heat transfer model in thermo-chemical hydrogen production process in the future.