JOURNAL OF THE ILLUMINATING ENGINEERING INSTITUTE OF JAPAN
Online ISSN : 1349-838X
Print ISSN : 0019-2341
ISSN-L : 0019-2341
Volume 83, Issue 2
Displaying 1-7 of 7 articles from this issue
  • Wataru Iwai, Yoshinori Saito, Sadahiro Sumi, Toshihiko Sakaguchi
    1999 Volume 83 Issue 2 Pages 81-86
    Published: February 01, 1999
    Released on J-STAGE: July 19, 2011
    JOURNAL FREE ACCESS
    The sensations of brightness perceived in a living room with downlights were investigated by psychological experiment with eighteen observers. Three positions and four types of downlight reflector were examined. The method of magnitude estimation was adopted to measure the sensation of brightness. In addition, the luminance of areas related to the sensation of brightness were measured with a CCD camera. The relationships between these luminances and the sensation of brightness are discussed.
    The results showed that the sensations of brightness for a living room with downlights were strongly affected by “average luminance within the area of the front wall” and by “luminance in the corners of the room”.
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  • Kazuaki Ohkubo, Teruaki Shigeta
    1999 Volume 83 Issue 2 Pages 87-93
    Published: February 01, 1999
    Released on J-STAGE: July 19, 2011
    JOURNAL FREE ACCESS
    The absolute fluorescent quantum efficiencies of NBS phosphor standard samples which were excited by a 254nm radiation were measured by a polychromator. The polychromator was calibrated by a conical cavity thermal radiation detector, which used polyvinylidene fluoride (PVDF) films, coated inside with gold black absorber. The effective spectral absorptance of the derector was constant within 0.3% over a wavelength region of 200-600nm. Reproducibility of the absolute fluorescent quantum efficiency was within ±0.02.
    The relative values of fluorescent quantum emitted per 254nm incident radiation quantum agreed with the NBS data within 3%. The fluorescent quantum efficiency of NBS phosphor standard samples (NBS 1027) was 0.81.
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  • Akihiro Inouye, Keiichi Shimizu, Ichiro Yokozeki
    1999 Volume 83 Issue 2 Pages 94-100
    Published: February 01, 1999
    Released on J-STAGE: July 19, 2011
    JOURNAL FREE ACCESS
    The effects of a change in the inductively coupled coil inductance on an electrodeless discharge lamp are investigated theoretically. The lamp power curve has a single peak as a function of the coil inductance. The power of the lamp changes considerably if a matching circuit is not designed suitably. High-frequency generator output current also changes considerably if the generator current curve has a sharp peak as a function of the coil inductance. This sometimes causes the generator switching device to fail, but if the current curve has a dull peak, the peak point almost coincides with the peak of the lamp power curve and the current change is not so rapid. If the matching circuit is designed to match the point near this peak, the lamp power and the generator output current not increase but onlydecrease slowly by the coil inductance changing.
    This paper clarifies the design rules of the matching circuit to minimize the lamp power and the high-frequency generator output current changes. Tests are conducted to check that the designed circuits satisfy the rules.
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  • Toshiro Kajiwara, Masatoshi Sano
    1999 Volume 83 Issue 2 Pages 101-108
    Published: February 01, 1999
    Released on J-STAGE: July 19, 2011
    JOURNAL FREE ACCESS
    Unstable discharge phenomena, which are known as moving striations or ionization waves, occurring in the dischage tube filled with low pressure rare gas and saturated mercury vapor were investigated. They appeared within a positive column when the discharge tubes were operated on the commercial ballast applied for 50 or 60 Hz frequency and under the room temperature. It was found that these spontaneously generated moving striations showed the different behaviors from artificial ones according to research on the dispersive plane between angular frquency ω and wave number k depending on the ambient temperature and the filling pressure of rare gas. As a result, natural moving striations showed the positive gradient contrary to the negative slope of ω/k based on artificially generated ionization waves.
    The relatioship between phase angle of discharge current and spectral line intensity ratio of rare gas/Hg in moving striations was investigated using a multi-channel spectrometer. The results suggest that the average kinetic energy of electrons kBTe after reignitions was increased until the excitation levels of rare gas. It was confirmed that the solution of rate and energy balance equations introduced by taking into account the non-Maxwellian distributuion function for energetic electrons supports the experimental results.
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  • Kazuaki Ohkubo, Yasuo Nakagawa, Yukihiro Sato, Kohtaro Kohmoto, Yoshih ...
    1999 Volume 83 Issue 2 Pages 109-114
    Published: February 01, 1999
    Released on J-STAGE: July 19, 2011
    JOURNAL FREE ACCESS
    The 253.7nm irradiance standards were compared among five Japanese organizations-Sankyo Denki Co., Ltd, Toshiba Lighting & Technology Corp., Iwasaki Electric Co., Ltd., Topcon Corp., and Matsushita Electric Industrial Co., Ltd. Three of the participants calibrated their standard by optical filters and thermal detector having its absolute responsivity. Those of the other two participants were calibrated using a Si-PD, silicon photodiode, having absolute responsivity to 253.7nm line spectral irradiance.
    All the standards were measured with a 253.7nm irradiance transferring detector consisting of a GaAsP-photodiode and a narrow bandpass optical interference filter around 253.7nm.
    As a result, the 253.7nm irradiance scales of the two of the participants using thermal detector calibration and the one of them using Si-PD calibration agreed well within±1.5% deviation. The other two's scales were deviated by 5% to 10%from the average of the first three's.
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  • Akiko Negishi, Takeshi Nishimura
    1999 Volume 83 Issue 2 Pages 115-118
    Published: February 01, 1999
    Released on J-STAGE: July 19, 2011
    JOURNAL FREE ACCESS
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  • [in Japanese], [in Japanese], [in Japanese]
    1999 Volume 83 Issue 2 Pages 119-121
    Published: February 01, 1999
    Released on J-STAGE: July 19, 2011
    JOURNAL FREE ACCESS
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