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54 巻, 10 号
選択された号の論文の5件中1～5を表示しています
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第2報照明の基礎技術大谷 泰之, 佐土根 範次1970 年 54 巻 10 号 p. 546-556
発行日: 1970/10/25
公開日: 2011/07/19
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杉本 賢, 馬込 一男1970 年 54 巻 10 号 p. 561-567
発行日: 1970/10/25
公開日: 2011/07/19
ジャーナル フリーProblems of air pollution have come to draw public attention of late. Concerning them, there have been many reports that negative air ions, which are negatively charged oxygen, water vapor or other fine particles, produce beneficical effects physiologically. When negative ions in air are reduced by air pollution, various ill effects are caused. In such cases, artificially produced negative ions are found useful.
The photoelectric threshold for gold is less than the energy of 2537 Å radiation emitted from a germicidal lamp. Thus from the metal, negative air ions can be produced photoelectrically.
Both forward and backward photoemissions from a vacuum-deposited Au film under ultraviolet radiation of a germicidal lamp gave the maximum yield at about 60 Å thickness. Further, the amount of air moved past the generator, the construction of the generator and the strength of electric field were determined experimeutally.
Relatively simple in construction this generator can be used to destroy bacteria and viruses in the air as well as generate ions.抄録全体を表示PDF形式でダウンロード (1020K) -
南条 基, 上田 勇, 湊 秀幸, 栗岡 豊1970 年 54 巻 10 号 p. 568-574
発行日: 1970/10/25
公開日: 2011/07/19
ジャーナル フリーThe present paper describes the method selecting for a photomultiplier with good performance, especially suitable for making the measurement with high precision and accuracy at very weak light levels, such as the ultra-violet radiation from a black body standard radiator.
The following four characteristics were studied:
(1) photocathode sensitivity,
(2) anode sensitivity and signal to noise ratio,
(3) stability or fatigue, and
(4) linearity of the electrical output to the light input.
The relations among the above four characteristics were also investigated using two kinds of measuring methods, which were D. C. method and photoelectron counting method. The former is the most conventional method for measuring average photoelectric D. C. current from a photomultiplier and the latter is a recently developed method for counting the photoelectron pulses from a photomultiplier.
Based on these studies, some notable remarks in selecting photomultipliers were revealed as follows;
(1) Although the photocathode sensitivity is the most important characteristic, there are large variations among the sensitivities of photomultipliers.
are large variations among the sensitivities of photomultipliers. photoelectron counting method, and it is independent of the photomultiplier gain in the D. C. method.
(3) Even the photomultiplier, which has the fatigue of several percent in a few hours in the D. C. method, shows better stability in the photoelectron counting method.
(4) In the linearity, there is no significant difference between the two methods.抄録全体を表示PDF形式でダウンロード (1157K) -
橋本 健1970 年 54 巻 10 号 p. 575-579
発行日: 1970/10/25
公開日: 2011/07/19
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1970 年 54 巻 10 号 p. plate1-plate8
発行日: 1970/10/25
公開日: 2011/07/19
ジャーナル フリーPDF形式でダウンロード (10171K)
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