巻号一覧
16 巻, 5 号
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徳山 巍1988 年 16 巻 5 号 p. 240
発行日: 1988/05/28
公開日: 2010/02/26
ジャーナル フリーPDF形式でダウンロード (108K) -
ポット分子の生成と反応中島 信昭1988 年 16 巻 5 号 p. 241-251
発行日: 1988/05/28
公開日: 2010/02/26
ジャーナル フリーUV photochemistries of benzene, alkylbenzenes, and olefins are described from a new point off view: hot molecule mechanism. Hot molecule (denoted as S0**) is a highly excited vibrational state in the ground electronic state. The primary process of these molecules irradiated with Ar F laser light (193.2 nm) is internal conversion to the ground state in the gas phase and S0**forms. The equivalent vibrational temperatures of S0**are very high 2000-4000K. Subsequent reactions are found to be similar to those driven by thermal energy.
Hot molecule (S0**) can be an intermediate of UV multiphoton dissociation. S0** shows strong absorption in the U V region and hence efficiently absorbs a second photon which causes dissociation. Radical fragmentations are major reactions for this new multiphoton chemistry.抄録全体を表示PDF形式でダウンロード (1003K) -
レーザー加工時の反射, 通過及びプルーム透過後のレーザ光の観察渡部 武弘, 吉田 嘉太郎, 志茂 主税1988 年 16 巻 5 号 p. 252-266
発行日: 1988/05/28
公開日: 2010/02/26
ジャーナル フリーConstruction of machining mechanism with laser beam is useful for deciding the algorithm in case of calculating the machined shapes. In the former paper, melting and removing processes were investigated through machinability of various metals with laser beam. In this paper, the mechanism was investigated through observations of various phenomena in laser machining. The results obtained are as follows. (1) The reflectivity of laser beam at the work surface decreased gradually with increasing the temperature of workpiece and rapidly with generation of a keyhole in the molten pool. (2) The diameter and the penetration speed of the keyhole were estimated by observations of laser light passing through the workpiece. (3) The speed decreased with an increase in the machined depth, and was influenced mainly by thermal diffusivity of the workpiece and melting point in case of low and high power density, respectively. (4) The plume produced with laser irradiation was observed by high speed photograph and the transmissivity of the plume was estimated by observations of laser light transmitting through the plume. (5) About 20% of laser beam energy was absorbed by the plume in pure aluminum and about 38% in stainless steel (SUS304) when the laser beam was irradiated with power density of12.0MW/cm2 and pulse duration of 4.5ms.抄録全体を表示PDF形式でダウンロード (2812K) -
内山 太郎, 広橋 道夫, 宮田 英憲, 坂井 辰彦1988 年 16 巻 5 号 p. 267-277
発行日: 1988/05/28
公開日: 2010/02/26
ジャーナル フリーA possibility of triggering lightning using laser is investigated. A long plasma channel is produced in atmospheric air when pulsed CO2 laser radiation is focused by a mirror. Length of plasma channels are measured for focal length of 10m, 20m, 30m, 45m and 60m respectively. A length of 30m plasma channel is produced when a energy. of 50 J unstable mode is focused by the mirror having 60m focal length. The propagated unstable mode patterns and intensities are calculated using the Fresnel diffraction integral, and compared with experimental results.
The plasma channel produced by the mirror of 10m focal length is applied for triggering electrical discharge. The arc which has the length of 1.8m is triggered and guided by the plasma channel, and some characteristics are obtained.抄録全体を表示PDF形式でダウンロード (1433K) -
中楯 末三1988 年 16 巻 5 号 p. 278-286
発行日: 1988/05/28
公開日: 2010/02/26
ジャーナル フリーA method for detecting a shift of Young's fringes is applied to a high precision measurement of a displacement of a piezoelectric transducer (PZT). An arctangent calculation with Fourier cosine and sine integrals of the fringe profile gives the phase of Young's fringes, which is proportional to the displacement of the PZT. The method of the phase detection is described with theoretical error estimations. Experimental results of the PZT displacement using a non-polarizating Michelson interferometer are presented with estimations of the measurement accuracy and the minimum detectable phase change.抄録全体を表示PDF形式でダウンロード (1320K)
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