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research-article

Sub-pixel temperature measurements in hypersonic plasma jet environments using high speed multispectral pyrometry

[+] Author and Article Information
Tairan Fu

Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Beijing Key Laboratory of CO2 Utilization and Reduction Technology, Department of Thermal Engineering, Tsinghua University, Beijing 100084, P. R. China
trfu@mail.tsinghua.edu.cn

Jiangfan Liu

Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Beijing Key Laboratory of CO2 Utilization and Reduction Technology, Department of Thermal Engineering, Tsinghua University, Beijing 100084, P. R. China
13146597262@163.com

Minghao Duan

Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Beijing Key Laboratory of CO2 Utilization and Reduction Technology, Department of Thermal Engineering, Tsinghua University, Beijing 100084, P. R. China
398731605@qq.com

Sen Li

State Key Laboratory of High Temperature Gas Dynamics, Institute of Mechanics, Chinese Academy of Sciences, Beijing, 100190, P.R. China
lisen@imech.ac.cn

1Corresponding author.

ASME doi:10.1115/1.4038874 History: Received March 07, 2017; Revised October 22, 2017

Abstract

A high-speed (2 kHz) near-infrared (1.0 µm~1.65 µm) multispectral pyrometer was used for noninvasive measurements of the sub-pixel temperature distribution near the sharp leading edge of a wing exposed to a supersonic plasma jet. The multispectral pyrometer operating in the field measurement mode was able to measure the spatial temperature distribution. Multiple spectra were used to determine the temperature distributions in the measurement region. The spatial resolution of the multispectral pyrometer was not restricted to one "pixel" but was extended to sub-pixel accuracy (the temperature distribution inside one pixel in the image space corresponding to the point region in the object space). Thus, this system gives high-speed, multi-channel, and long working time spatial temperature measurements with a small data stream from high speed multispectral pyrometers. The temperature distribution of a ceramic model with a wing leading edge was investigated with the leading edge exposed to extreme convective heating from a high-enthalpy plasma flow with a total enthalpy of 2.0 MJ/kg. Simultaneous measurements with a multispectral pyrometer and an image pyrometer verify the measurement accuracy of the sub-pixel temperature distribution. It's a great contribution for multispectral pyrometry for in situ noninvasive temperature diagnostics in supersonic plasma jet environments.

Copyright (c) 2017 by ASME
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