成果報告書詳細
管理番号20160000000808
タイトル*平成27年度中間年報 低炭素社会を実現する次世代パワーエレクトロニクスプロジェクト 次世代パワーエレクトロニクス応用システム開発の先導研究 小型高効率GaN発振器を用いたUVーC発生装置の研究開発(2)
公開日2016/9/7
報告書年度2015 - 2015
委託先名株式会社プラズマアプリケーションズ
プロジェクト番号P10022
部署名IoT推進部
和文要約
英文要約Title: The next-generation power electronics project for realizing a low-carbon society/
Leading research of next-generation power electronics application systems developments/
Feasibility Study on research and development of UV-C generators using compact, high-efficiency
GaN oscillators (FY2015-FY2016) FY2015 Annual Report.

Quartz double wall lamps filled with low pressure Hg and argon buffer gas have been ignited
by microwave to investigate UV-C power and conversion efficiency as a function of lamp diameter
and length, amount of filling material for UV-C radiation, microwave power for lamp ignition and
lamp wall temperature. The measured UV-C power : PUV-C and conversion efficiency : η were
compared with conventional AC/DC electric power ignited UV-C low pressure Hg lamp with similar
lamp structure. As a consequence, higher PUV-C and η could be obtained under the optimum lamp
ignition conditions as follows:1) PUV-C and ηsensitively depend on the lamp wall temperature
and argon gas pressure, 2) The present UV-C lamps ignited by microwave power have such an
advantage that shorter lamp length with 10 cm ~ 15cm can sustain the higher PUV-C and ηcompared
with commercial available AC/DC discharged UV-C lamps with the lamp length similar to the present
microwave discharged UV-C lamps. The excellent UV-C lamp properties found by the present research
project can be applied to the compact and long lifetime UV-C light sources with high η, 3) However
the microwave discharged UV-C lamps have the problem that the Hg atoms as UV-C radiation species
are absorbed by the quartz wall and that the optimum UV-C radiation would not be sustained for
long duration. Such a phenomenon became more remarkable at the higher lamp wall temperature.
4) the optimum lamp wall temperature to show higher PUV-C and η is ranged from 40ー50℃,
at which the temperature, Hg absorption is not so strong that the life time of microwave discharge
lamp will be extended at least a few times longer than that of the conventional AC/DC discharged
UV-C lamps. 5) Ozone gas can be produced by UV-C light sources and give some damage to the human
body. Therefore, ozone-less UV-C lamps should be developed for the wide application of the present
UV-C lamps. Thus, the ozone-less UV-C lamps have been produced by using quartz glass which can cut
the ozone producing short wavelength radiation. The UV-C radiation properties of ozone-less lamps
do not change compared with those of the ozone producing UV-C lamp. Ozone detector has also
confirmed no ozone production in the vicinity of the lamp. Thus, the ozone-less lamp have opened
the various application such as water processing systems, shoes-refreshers, bed or Futon-cleaners
and so on. 6) Finally, 185 nm radiation from UV-C lamp can be extracted using the VUV transparent
quartz glass. The lamp structure is the same as the ozone-less UV-C lamps. As well known, 185nm
light can be absorbed resonantly by DNA and can lead to kill the bacteria. So, it is useful to apply
the sterilization together with 254nm UV-C light. Measured 185nm radiation power from the lamp
ignited by 10 W microwave input is 0.3 W, which is strong enough to kill the bacteria. This lamp
can be applied to the water processing systems to make sterilization inside the closing systems.
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