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Investigation of Water-Vapor Plasma Excited by Microwaves as Ultraviolet Light Source

機譯：微波作為紫外光源激發(fā)水蒸氣等離子體的研究

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The potential of using water-vapor plasmas excited by microwaves as a ultraviolet (UV) light source has been investigated by using various pressures and input powers. The UV irradiation power increased and saturated at a pressure range dependent on the input power. On the other hand, other visible and infrared emissions corresponding to four atomic lines, i.e., the Balmer series of hydrogen at 486.1 nm (Hβ) and 656.3 nm (Hα) and oxygen atoms at 777.2 and 844.6 nm, were clearly decreased with an increase in the total gas pressure. It was found that pressures (1.4–2.0 kPa) near the saturated water-vapor pressure were found to give the most intense UV irradiation. With a vapor pressure of 1.6 kPa and a total microwave power of 300 W, the power density of UV (Γuv) was measured to be 10.5 μW · cm?2 at a distance of 30 cm from the center of the discharge tube as measured through an optical viewing port on the cavity discharge applicator. This value for (Γuv) is comparable to that for a mercury lamp. However, the (ηuv) efficiency was estimated to be considerably lower than that of a mercury lamp.
機譯：通過使用各種壓力和輸入功率，已經(jīng)研究了使用由微波激發(fā)的水蒸氣等離子體作為紫外線（UV）光源的潛力。 UV照射功率在取決于輸入功率的壓力范圍內(nèi)增加并達(dá)到飽和。另一方面，與四個原子譜線相對應(yīng)的其他可見光和紅外光發(fā)射明顯增加，分別是486.1 nm（Hβ）和656.3 nm（Hα）的巴爾默級數(shù)氫和777.2和844.6 nm的氧原子總氣壓。結(jié)果發(fā)現(xiàn)，接近飽和水蒸氣壓力的壓力（1.4–2.0 kPa）產(chǎn)生最強烈的紫外線照射。在蒸氣壓為1.6 kPa且總微波功率為300 W的情況下，通過測量，在距放電管中心30 cm處，UV（Γuv）的功率密度為10.5μW·cm-2。腔體排放施藥器上的光學(xué)觀察口。 （Γuv）的該值與水銀燈的相當(dāng)。但是，估計（ηuv）效率明顯低于水銀燈的效率。

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