Netsu Bussei

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Thermal and radiative environment of human life space is characterized strongly by the solar radiation and by the radiation from surrounding walls as well as air temperature and humidity. To consider the environmental radiation quantitatively, absorptance spectra and total emittance of the surfaces should be measured properly. In this work we measure spectra of normal incidence absorptance of such surfaces in a near-ultraviolet through infrared region of wavelength of 0.30~11 μm. On the basis of measured spectra we evaluate solar absorptance of the surfaces to respond to the needs of radiation characteristics of the surfaces in the fields of architecture, life science and solar engineering. Objective surfaces of the measurement are surfaces of inner and outer environments: clothes, inner wall materials, painted surfaces, ceramics, bricks, outer wall materials, road materials, leaves, etc. We also observe the transition of absorptance spectra of a water-wet cement surface in a drying process.

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Characteristics of generation of electricity by thermophotovoltaic (TPV) cells made of GaSb semiconductors were investigated using a pseudo blackbody-surface consisting of a wave guide and an electric heater. The TPV cells were manufactured through a molecular beam epitaxial growth method. The conversion efficiency reached 4% in the range of wavelength shorter than 1.8µm at the source temperature of 668℃. The maximum output power was 18mW/cm² at 851℃.

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