SPECTRAL CONTROL OF EMITTANCE USING RECTANGULAR MICROCAVITIES
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Accession number;07A0043254
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| Title;SPECTRAL CONTROL OF EMITTANCE USING RECTANGULAR MICROCAVITIES |
| Author;
HIRASHIMA DAISUKE
(Tokyo Inst. of Technol.)
KAMEYA YUKI
(Tokyo Inst. of Technol.)
HANAMURA KATSUNORI
(Tokyo Inst. of Technol.)
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Journal Title;Thermophys Prop
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Journal Code:X0031A
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ISSN:0911-1743
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VOL.27th;NO.;PAGE.154-156(2006)
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| Figure&Table&Reference;FIG.4, REF.4 |
| Pub. Country;Japan |
| Language;Japanese |
| Abstract;To examine the influence of periodic rectangular microcavities made on an emitter surface, spectrally selective property of the emitter was investigated through experiment. The microcavities are made of nickel and microcavity's scale is wavelength's order. The experiment of spectroscopic measurement is followings: The rectangular microcavities are made in an area 2.0x2.0.MU.m'2' and a cavity is a cubic, 0.5x0.5x0.5.MU.m'3'. The emitter is set in a vacuum chamber and heated by CO2 laser in order to prevent from being oxidized. The radiation from the emitter is reflected by a concave mirror and a flat Au mirror, and finally is lead to a spectrometer. The radiation whose wavelength is above 1.1.MU.m is measured by a thermopile ditector, and less 1.1.MU.m is measured by a silicon photo diode. In the experiment, the temperature of the emitter is 1052K, and measured wavelength range is 0.78.MU.m to 4.0.MU.m. First, energy emitted in the normal direction from the emitter of flat surface and a black body is measured, and an emittance of flat surface is computed. Next, energy emitted in the normal direction from the emitter surface having rectangular microcavities is measured, and its emittance is computed using the proportion with flat surface. The emittance of metal surfaces with microcavites is enhanced in the wavelength region less 1.4.MU.m, which is equal to the length of a diagonal of cavity's aperture. In this region, thermal radiation would be resonant by an influence of the surface microstructure. And in the region above 1.4.MU.m, emittance of emitter with microcavities is nearly equivalent to flat surface. In this region, the surface microstructure would behave as flat surface. This radiation property would result from resonance inducted by emitter's three dimensional structures. As a result, by constructing periodic microstructure on an emitter, spectrally selective property can be controlled.... (author abst.) |
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