Optical properties of nanostructured tungsten in near infrared range
Optical properties of nanostructured tungsten in near infrared range
复制标题
纳米结构钨在近红外范围内的光学特性
DOI：
10.1088/0741-3335/54/10/105015
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发表时间：
2012
影响因子：
2.2
通讯作者：
S. Takamura and T.Hatae
中科院分区：
文献类型：
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作者：
S. Kajita;N. Ohno;T. Yokochi;N. Yoshida;R.Yoshihara;S. Takamura and T.Hatae
在核聚变装置中，红外（IR）成像诊断已被广泛用于容器内表面的温度测量。在诊断中，壁面材料的光发射率和反射率的变化将是正确测量温度的一个重要问题。在这项研究中，在近红外范围内的光学性质的变化，暴露于氦等离子体的钨详细的实验研究，通过观察从加热样品的辐射光谱。通过暴露于氦等离子体，纳米结构从表面生长，而纳米结构在没有氦离子照射的情况下当表面温度升高时退火。从波长范围1400-4000 nm的辐射光谱中测量光发射率;结果表明，在纳米结构的形成和退火过程中，发射率在短时间内显著改变。讨论了光学性质的变化对红外诊断的影响。
In nuclear fusion devices, infrared (IR) imaging diagnostics have been widely used for the temperature measurement of in-vessel surfaces. For the diagnostics, variations of the optical emittance and reflectance of wall materials will be an essential issue to measure the temperature correctly. In this study, variations in the optical properties in near IR range of tungsten exposed to helium plasmas were experimentally investigated in detail by observing the radiation spectrum from a heated sample. By the exposure to the helium plasma, nanostructures were grown from the surface, while the nanostructures were annealed out when the surface temperature was raised without helium ion irradiation. The optical emittance was measured from the radiation spectrum in the wavelength range 1400–4000 nm; it was revealed that the emittance significantly altered for a short time period in the formation and annealing processes of nanostructures. The influence of the variation in the optical properties on the IR diagnostics is discussed.