Two-Dimensional Flame Temperature and Emissivity Distribution Measurement Based on Element Doping and Energy Spectrum Analysis

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Abstract
Most of the existing non-contact flame temperature measurement methods rely on the ideal thermal-optical excitation model, which has a great influence on temperature measurement accuracy. Therefore, based on element doping and energy spectrum analysis, this study proposes a novel two-dimensional (2-D) estimation method for flame temperature and emissivity distribution. The element doping method and laser-induced breakdown spectroscopy (LIBS) are introduced into the temperature field test. The external doped element whose spectral radiation characteristics are easy to be analyzed, is regarded as the measured particles to describe the flame temperature distribution from the side. And LIBS is used to analyze and select the doped element, and further determine the effective working wavelength of the optical camera. Besides, the relationship between spectral radiance and emissivity (L - ε) of doped samples is obtained by the emissivity calibration experiment. Then, the 2-D temperature and emissivity distributions can be estimated. Infrared thermograph is used to verify the accuracy of temperature measurement, the measurement error between calculated and standard values is not more than 5%. The experimental results of the oxygen-ethanol combustion flame show that this method can be well applied to the similar temperature measurement.
Funding Information
  • National Natural Science Foundation of China (52075504, 51575499, 61473267)
  • Pre-research Field Foundation of Equipment Development Department of China (61400030201)
  • Pre-Research Key laboratory Foundation of Equipment Development Department of China (6142001190413)
  • Foundation of Key Laboratory of Information Detection and Processing (ISPT2020-10)
  • Open Fund of State Key Laboratory of Deep Buried Target Damage (DXMBJJ2018-09)
  • Fund for Shanxi 1331 Project Key Subject Construction

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