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.
Highlights
High temperature combustion reaction is common in military, metallurgy, thermal power generation, engine manufacturing, and other industrial production industries
In this study, based on the element energy spectral excitation model and the element doping method, appropriate flame doping element is selected via laser-induced breakdown spectroscopy (LIBS) technology, and a narrow wavelength band filter detection system is designed
According to the research results of this paper, the following conclusions are drawn: (a) LIBS analysis can be used for flame temperature field detection
Summary
High temperature combustion reaction is common in military, metallurgy, thermal power generation, engine manufacturing, and other industrial production industries. Common temperature field reconstruction methods such as the two-color temperature measurement method [23], hyperspectral imaging and multi-wavelength thermography method [24] and light field imaging technology which combined with optical tomography reconstruction algorithm [25] These methods work by regarding the flame as a grey body or assuming a particular form of flame emissivity which ignore the radiation spectrum properties of the different elements inside the flame. It may affect the accuracy of temperature measurement. The accuracy of temperature measurement results and the effectiveness of this method are verified by infrared thermal imaging technology and thermocouple contact point temperature measurement technology
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