Dutra E C, Akin M C, Guyton R, Hawkins M C, La Lone B M, Mance J, Tiangco R, Wolff Z, Rodriguez E
Nevada National Security Site, Livermore Operations, Livermore, California 94550, USA.
Lawrence Livermore National Laboratory, Livermore, California 94550, USA.
Rev Sci Instrum. 2022 Nov 1;93(11):115112. doi: 10.1063/5.0099778.
Temperature is a complicated thermodynamic parameter to measure in dynamic compression experiments. Optical pyrometry is a general-purpose "work-horse" technique for measuring temperature from a radiant surface on these experimental platforms. The optical pyrometry channels are commonly held to the visible or Near-Infrared spectrum, which provides high fidelity temperature measurement for shock temperature above ∼1200-1500 K. However, low temperature (T < 1200 K) dynamic material experiments, including low pressure or quasi-isentropic studies, as well as experiments with complex thermodynamic paths, require Mid-Infrared (Mid-IR) for high fidelity measurements. This article outlines the design, testing, and characterization of a novel Mid-IR pyrometer system that can be configured between 2.5 and 5.0 µm, suitable for lower temperature measurements and for increasing the fidelity and precision of higher temperature measurements. Experimental validation was done on two separate gas gun platforms, with two separate impact velocities, achieving temperatures between 450 and 1100 K.
在动态压缩实验中，温度是一个复杂的热力学参数，难以测量。光学高温测定法是在这些实验平台上用于从辐射表面测量温度的通用“主力”技术。光学高温测定通道通常设置在可见光或近红外光谱范围内，这为高于约1200 - 1500 K的冲击温度提供了高保真度的温度测量。然而，低温（T < 1200 K）动态材料实验，包括低压或准等熵研究，以及具有复杂热力学路径的实验，需要中红外（Mid - IR）来进行高保真度测量。本文概述了一种新型中红外高温计系统的设计、测试和特性，该系统可在2.5至5.0 µm之间配置，适用于较低温度测量，并用于提高较高温度测量的保真度和精度。在两个不同的气枪平台上进行了实验验证，冲击速度不同，实现了450至1100 K之间的温度。
