用于压缩材料温度测量的OMEGA条纹光学高温计的绝对校准。

Absolute calibration of the OMEGA streaked optical pyrometer for temperature measurements of compressed materials.

作者信息

Gregor M C, Boni R, Sorce A, Kendrick J, McCoy C A, Polsin D N, Boehly T R, Celliers P M, Collins G W, Fratanduono D E, Eggert J H, Millot M

机构信息

Laboratory for Laser Energetics, University of Rochester, 250 East River Road, Rochester, New York 14623-1299, USA.

Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550, USA.

出版信息

Rev Sci Instrum. 2016 Nov;87(11):114903. doi: 10.1063/1.4968023.

DOI:10.1063/1.4968023

PMID:27910410

Abstract

Experiments in high-energy-density physics often use optical pyrometry to determine temperatures of dynamically compressed materials. In combination with simultaneous shock-velocity and optical-reflectivity measurements using velocity interferometry, these experiments provide accurate equation-of-state data at extreme pressures (P > 1 Mbar) and temperatures (T > 0.5 eV). This paper reports on the absolute calibration of the streaked optical pyrometer (SOP) at the Omega Laser Facility. The wavelength-dependent system response was determined by measuring the optical emission from a National Institute of Standards and Technology-traceable tungsten-filament lamp through various narrowband (40-nm-wide) filters. The integrated signal over the SOP's ∼250-nm operating range is then related to that of a blackbody radiator using the calibrated response. We present a simple closed-form equation for the brightness temperature as a function of streak-camera signal derived from this calibration. Error estimates indicate that brightness temperature can be inferred to a precision of <5%.

摘要

高能密度物理实验通常使用光学高温计来确定动态压缩材料的温度。这些实验结合使用速度干涉测量法同时测量冲击速度和光学反射率，可在极端压力（P > 1 Mbar）和温度（T > 0.5 eV）下提供准确的状态方程数据。本文报道了在欧米茄激光装置上对条纹光学高温计（SOP）的绝对校准。通过使用各种窄带（40纳米宽）滤光片测量来自美国国家标准与技术研究院可溯源的钨丝灯的光发射，确定了波长相关的系统响应。然后，利用校准后的响应，将SOP约250纳米工作范围内的积分信号与黑体辐射器的信号相关联。我们给出了一个简单的闭合形式方程，用于表示根据此次校准得出的亮度温度与条纹相机信号的函数关系。误差估计表明，亮度温度的推断精度可达到<5%。