Infrared imaging video bolometer

Infrared imaging video bolometer
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红外成像视频测辐射热计

DOI：
10.1063/1.1290044
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发表时间：
2000
期刊：
Review of Scientific Instruments
影响因子：
1.6
通讯作者：
B. Peterson
B. Peterson
中科院分区：
工程技术4区
文献类型：
--
作者：
B. Peterson

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提出了一种新的概念，红外成像测辐射热计提供全视频（二维）成像的辐射功率从等离子体。该概念保留了先前提出和测试的分段掩模红外成像测辐射热计（SIB）的所有优点（与常规金属箔电阻测辐射热计相比）。它避免了与SIB的铜掩模相关联的问题，同时给出了具有关于像素尺寸的改进的实验灵活性的等离子体辐射的全帧视频图像。噪声等效功率分析表明，与具有相同像素面积的SIB相比，红外成像视频测辐射热计的灵敏度提高了2-5倍，空间分辨率得到了提高。这些益处是以牺牲掩模为SIB中的箔提供的机械支撑为代价而获得的。一个数值算法是用来解决二维热扩散方程的箔，并确定随时间变化的空间分布的入射功率的箔从红外（IR）摄像机测量的箔温度。使用高斯模型的入射功率测试该算法表明，它可以准确地再现高斯模型的6%以内。一个简单的计划，绝对校准整个箔的描述和几个设计点的详细指出的范围和实验的灵活性的诊断使用目前可用的红外摄像机技术。
A new concept for an infrared imaging bolometer is proposed which provides full video (two-dimensional) imaging of the radiated power from the plasma. This concept preserves all the advantages (compared to conventional metal foil resistive bolometers) of the previously proposed and tested segmented mask infrared imaging bolometer (SIB). It avoids the problems associated with the copper mask of the SIB, while giving a full frame video image of the plasma radiation with improved experimental flexibility regarding the pixel size. Analysis of the noise equivalent power shows that compared to a SIB with the same pixel area, the infrared imaging video bolometer is 2–5 times more sensitive with improved spatial resolution. These benefits are gained at the expense of the mechanical support, which the mask provides for the foil in the SIB. A numerical algorithm is used to solve the two-dimensional heat diffusion equation for the foil and determine the time-dependent spatial distribution of incident power on the foil from the infrared (IR) video camera measurements of the foil temperature. Testing the algorithm using a Gaussian model of the incident power shows that it can accurately reproduce the Gaussian model to within 6%. A simple scheme to absolutely calibrate the entire foil is described and several design points are detailed pointing out the range and experimental flexibility of the diagnostic using currently available IR camera technology.