Development of the Plasma Imaging Spectrometry Using Tunable Spectra Camera and its Applications

等离子体发射谱线强度比的测量只需相对强度标定，结合碰撞辐射（CR）模型，可以有效地测量等离子体发射谱线的电子密度和温度。我们已经开发了一种成像光谱技术，该技术使用基于液晶技术的波长可调干涉滤波器，称为“Lyot滤波器”的类型。在东京大学的MAP-II（材料和等离子体）线性偏滤器模拟器中，对纯氦放电中的He I光谱进行了原理验证实验。CR模型在处理辐射俘获时采用光学逃逸因子近似。此外，我们改进了原型光谱相机的配置，以产生更明亮和更灵活的光学安排，采用微距摄影的光学。

Spectroscopy for line intensity ratio from plasma emission only needs relative intensity calibration and is regarded as an useful method to determine the electron density and temperature by combining with the collisional-radiative(CR) model. We have developed an imaging spectrometry technique that uses the wavelength-tunable interference filter based on liquid-crystal technology known as a type of" Lyot filter". Proof-of-principle experiments were conducted for He I spectra in pure helium discharge in the MAP-II(material and plasma) linear divertor simulator at the University of Tokyo. The CR model uses the optical escape factor approximation in dealing with radiation trapping. Moreover, we have improved the prototype spectra camera configuration to yield brighter and more flexible optical arrangement by adopting the optics for macro photography.