Investigation of Water-Vapor Plasma Excited by Microwaves as Ultraviolet Light Source
Investigation of Water-Vapor Plasma Excited by Microwaves as Ultraviolet Light Source
复制标题
微波作为紫外光源激发水蒸气等离子体的研究
DOI：
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发表时间：
2009
影响因子：
1.5
通讯作者：
A. Hatta
中科院分区：
文献类型：
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作者：
J. Oh;K. Kawamura;B. Pramanik;A. Hatta
利用微波激发的水蒸气等离子体作为紫外光源，研究了不同压力和输入功率对紫外光源的影响。紫外辐照功率随输入功率的增大而增大，并在一定的压力范围内达到饱和。另一方面，随着总气压的增加，其他四条原子线对应的可见光和红外辐射明显下降，即486.1 nm （Hbeta）和656.3 nm （Halpha）的Balmer系列氢和777.2 nm和844.6 nm的氧原子。在饱和水汽压附近的压力（1.4 ~ 2.0 kPa）产生的紫外线照射强度最大。在蒸汽压为1.6 kPa、总微波功率为300 W的条件下，在距离放电管中心30 cm处，通过空腔放电器上的光学观察口测得紫外功率密度（Gammauv）为10.5 μ middocm -2。（Gammauv）的这个值与水银灯的值相当。然而，（etauv）的效率估计比汞灯要低得多。
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 ( Hbeta) and 656.3 nm (Halpha) 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 (Gammauv) was measured to be 10.5 muWmiddotcm-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 (Gammauv) is comparable to that for a mercury lamp. However, the (etauv) efficiency was estimated to be considerably lower than that of a mercury lamp.