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Summary form only given. The radiation power has been applied to various fields such as ultraviolet ray sterilization and large-scale lightings, recently. The plasma arc technology has the feature of high temperature, high luminance, and high energy. The radiation power and wavelength depend on the pressure, current, atmosphere and wavelength. In this paper, the temperature distribution, the radiation...
Summary form only given. The decrease of electrode erosion is important to keep the arc and to save the cost. Normally, the vacuum or rare gases such as argon and helium are used to prevent the electrode erosion. If the anode attachment of arc is moving, the decrease of electrode erosion could be achieved even if atmosphere is air. In this paper, the arc movement in rail-gun. especially restrike phenomena...
A municipal waste of 50 million tons a year has been generated in Japan. There is demand for harmless processing and environmental safety of fly ash. Plasma arc is effective in melting process of one of the fly ash. Incineration and melted processing technology of argon and nitrogen plasma are dominate in Japan. However, there are few reports of radiation distribution emitted from argon and nitrogen...
Summary form only given. Plasma arc heating has the following outstanding features compared with combustion heating such as the high temperature, high energy density and little exhaust gas. Therefore, it is applied to dissolution, refinement, temperature adjustment of melting steel et al. In addition, the applying plasma arc heating technology, which can make the volume reduction and harmless processing...
In this study, we achieve extension of electronically tuned wavelength region to the mid-infrared region with difference-frequency generation (DFG) of the two wavelengths oscillated Ti:sapphire laser.
In this work presents a picosecond pulsed Ti:sapphire laser pumped with a frequency-doubled LD-pumped cw Nd:YVO4 laser and intracavity second harmonic generation (SHG) of picosecond pulsed rapid and random wavelength tuned Tksapphire laser. The laser allows the tuning range from UV to blue with picosecond duration. Moreover, the paper demonstrated a pumping of fluorescent proteins (FPs) using the...
Poly methyl methacrylate (PMMA) has some excellent optical properties among polymer materials, such as low refraction. Accordingly, PMMA is utilized widely such as lens and optical fiber in optical category. But because of its low surface hardness, the surface is easily damaged, and the transparency decreases with time. Therefore, if the surface hardness of PMMA can be improved, it is expected that...
Cathode spots of a low-pressure arc can remove oxide layers and evaporate impurities on metal surfaces. Removal of the oxide layer using cathode spots is expected to solve recent obstacles to chemical and mechanical cleaning methods. Various phenomena of cathode spots have been investigated for pre-treatment of atmospheric pressure plasma spray (APPS). This study addressed the dependence of initial...
Currently, mostly chemical and mechanical way are used to remove oxide layers from metal layers. However, both retain environmental problems such as emission of secondary wastes. So, the treatment using low pressure arc is recommended to reduce the influence to the environment. However, the metal surface after treatment by low pressure arc tends to becomes rough. In this paper, the roughness of SUS430...
Remarkable characteristic of cathode spot of low pressure arc can remove the oxide layer preferentially. Recently, cathode spot of low pressure arc have been used for cleaning metal oxide surface before the thermal spray or surface modification. However, there are few reports on the cathode spot movement or the oxide removal process. The experiment carried out by using the SS400 cathode work piece...
We have demonstrated broadly tunable mid-infrared generation from 5 mum to12 mum by difference frequency generation pumped with an electronically-tuned-Ti:sapphire laser. Rapid- and random-access of wavelength is realized in the mid-infrared region.
Low-pressure arc cleaning is a process for removing an oxide layer. Currently, chemical and mechanical means are typically used to remove such layers. However, both methods present difficulties such as a liquid waste, dust, and noise. Regarding the low-pressure arc cleaning, waste comes from one source: the oxide layer. In addition, the cathode spot has very high temperatures that are sufficient to...
Summary form only given. Remarkable characteristic of cathode spots of low pressure arc can remove the oxide layer preferentially. Recently, cathode spot of low pressure arc has been used for cleaning metal oxide surface before the thermal spray or surface modification. However, there is few reports on the cathode spot movement or the oxide removal process. The experiment carried out by using the...
Summary form only given. The twin torch plasma arc can generate a wide space of high temperature and treat non-conducting material, and also a mixture because it is a non-transfer type. Therefore, the twin torch plasma arc is a more effective device for treatment of hazardous waste. In this paper, a 300 kW twin torch plasma arc furnace was developed. This facility was designed to enable to be mounted...
Summary form only given. The twin torch plasma arc has a high temperature arc medium. It can generate high temperature and treat nonconducting material, even though it is a non-transfer type. Therefore, the twin torch plasma arc is a more effective device for treatment of hazardous waste. However, the arc mode is not easy to control in the twin torch plasma arc. In addition, the appropriate arc mode...
Summary form only given. The characteristic of plasma arc is high temperature, high intense radiation and high energy. Especially, the UV radiation power can be applied for sterilization. In this paper, the number density and net emission coefficient for high temperature argon mixed with iron and mercury vapors are calculated by using a line spectrum emission, free-bound emission, and free-free emission...
Summary form only given. The low pressure vacuum arc cleaning is a smart processing way of removing an oxide layer. The chemical and mechanical ways are mostly used to remove it, currently. However, both have severe problems such as liquid wastes, dust and noise. In the case of low pressure arc cleaning, there is only one place where the waste comes, from the oxide layer. In addition, because the...
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