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57 巻, 8 号
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鈴木 守, 長坂 武彦, 羽生 光宏, 山村 恭平, 西堀 稔1973 年 57 巻 8 号 p. 528-535
発行日: 1973/08/20
公開日: 2011/07/19
ジャーナル フリーThe quartz-bromine lamp here described was designed as a secondary standard lamp of spectral irradiance (0.25-2.5μm). In order to obtain a desirable reproducibility of spectral irradiance, the lamp bulb having steatite blocks on both ends is united with a “U”-shaped steel holder, under which a rectangular steel plate is fixed. The front edge of the plate is polished and its center serves as the original point of measuring the distance along the normal to this plane.
The lamps are classified into two types: One with clear bulb and the other with frosted bulb. The former lamps are selected for the smaller variation of the radiant intensity around the designated direction (less than 0. 25% within angles of 1. 5 degress), but the latter need no selection in this point. Both types are based on the commercial halogen lamps (JPD-5000) having coiled coil filaments and being operated horizontally. When operated at the rated voltage of 100 V, distribution temperature of the lamp is 3150±15 K, and the useful calibration life of 70 to 100 hours for 0. 5% change of radiant intensity may be expected, while the lamp current decreases about 0. 008 % per hour. The time recuired for aging varies from 10 to 50 hours.
The spectral distribution of the lamp with clear bulb is compared with that of the full radiator at the same temperature as the distribution temperature of the lamp, and the ratios of the spectral distributions at each wavelength are normalized at the wavelengths of 460 and 660 nm. The coefficients thus obtained are used to estimate the spectral distribution of the lamp operated at a known distribution temperature.抄録全体を表示PDF形式でダウンロード (3233K) -
渡会 吉昭, 圷 秀三, 水野 秀夫1973 年 57 巻 8 号 p. 536-544
発行日: 1973/08/20
公開日: 2011/07/19
ジャーナル フリーThe typical high-pressure sodium lamp has a color temperature of about 2, 100 K, a lamp efficacy of 110lm/W, and a general color rendering index of 20 to 30. Through our experiments with increasing sodium-vapor pressure and varying ratio of mercury to sodium in the discharge tube, we have obtained design data for a new lamp with the following characteristics:
(1) Color temperature of up to 4, 000 K
(2) General color rendering index of close to 88 at about 2, 550 K
(3) High saturation of illuminated colors, resulting in a color rendition that is preferred to that of a reference illuminant
(4) Lamp efficacy of about 60 lm/W at 2, 550 K
In the discharge tube of the new lamp, the molecules and the pseudo molecules of sodium increase with an increasing sodium-vapor pressure, and they are localized in the vicinity of the tube wall. The radiation from the arc plasma in the central portion of the tube is modulated by the sodium vapor layer containing such molecular sodium particles. The existence of a buffer gas makes the arc plasma contract thermally towards the axis of the tube, which expands the sodium vapor layer, and gives a strong modulation to the radiation.抄録全体を表示PDF形式でダウンロード (2797K) -
金子 直礼, 高橋 貞雄, 藤井 克人1973 年 57 巻 8 号 p. 545-554
発行日: 1973/08/20
公開日: 2011/07/19
ジャーナル フリーBased on the experimental studies of luminance preferences, this paper made an attempt to evaluate luminance distributions of the visual field in office environments.
A full-sized experimental room was mocked up where the luminance of ceiling and face-wall could be changed continuously while keeping constant the luminance of working plane. Various brightness patterns were assessed by six observers using the method of categarical judgement. From this experiment, the lower limits of luminance for ceiling and face-wall with respect to the working plane were estimated.
These luminance limits were applied to evaluate the calculated luminance ratios among main surfaces in a typical office under 14 different illuminating conditions. According to the results, the use of the recessed fluorescent luminairs with clear prismatic panel or with plastic louver showed a tendency to make the interior gloomy because of the insufficient incident flux to the ceiling and the wall surfaces.抄録全体を表示PDF形式でダウンロード (3173K) -
黒沢 凉之助1973 年 57 巻 8 号 p. 555-558
発行日: 1973/08/20
公開日: 2011/07/19
ジャーナル フリーPDF形式でダウンロード (508K) -
1973 年 57 巻 8 号 p. plate1-plate8
発行日: 1973/08/20
公開日: 2011/07/19
ジャーナル フリーPDF形式でダウンロード (9248K)
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