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- W2171394962 abstract "Integrating sphere photometers are simple systems to measure total luminous flux. However, there is the issue of self-absorption, especially in the case of measurement of LEDs. For example, a high-power LED includes parts other than the light emitting point inside the integrating sphere, such as a large heat sink and an electric circuit module. As a solution, we introduced the integrating hemisphere for the measurement of the total luminous flux of these devices. The integrating hemisphere was composed of a hemisphere whose inside wall was coated with BaSO4 and a high reflectance mirror, installed in the equatorial plane. The light source under test was set inside the hemisphere near the central part of the mirror. The spherical integrating surface consisted of the real image on the integrating hemisphere side and the virtual image on the mirror side, because the light source was set up at the center of the mirror in the equatorial plane. One of the advantages was that only the light source was present inside the integrating hemisphere while the lamp supporter, driving devices and other parts were outside. Even for the measurement of a high-power LED installed in a temperature controlled module with a large heat sink, only the illuminant part is inside the integration space. Moreover, its emitting part was located at the center of an ideal integration space by the virtual image from the mirror. As a result, the self-absorption of the sample was significantly reduced." @default.
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- W2171394962 date "2011-01-01" @default.
- W2171394962 modified "2023-09-23" @default.
- W2171394962 title "Total Luminous Flux Measurement System Using Integrating Hemisphere Photometer" @default.
- W2171394962 doi "https://doi.org/10.2150/jlve.35.76" @default.
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