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Method for measuring flame temperature and emissivity distribution based on spectral radiance intensity

A spectral radiation and intensity measurement technology, applied in the field of flame spectrum analysis, can solve the problems of unreliable, independent results and large limitations

Inactive Publication Date: 2015-06-03
TSINGHUA UNIV +1
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Problems solved by technology

Existing methods have large limitations and cannot obtain reliable and independent results, so it is of great practical significance to develop a measurement method that can effectively give temperature and emissivity distribution based on radiation intensity

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  • Method for measuring flame temperature and emissivity distribution based on spectral radiance intensity
  • Method for measuring flame temperature and emissivity distribution based on spectral radiance intensity
  • Method for measuring flame temperature and emissivity distribution based on spectral radiance intensity

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Embodiment Construction

[0033] figure 1 It is the overall flowchart of the method of the present invention, the method first utilizes the spectrometer to obtain the flame spectral radiation intensity to be measured, and outputs the response value within the measurement range of the spectrometer and the spectral radiation intensity of the corresponding flame at different wavelengths; utilizes the two-color method to solve the initial value, and gradually solves the For the calculation results of different orders, the final convergence result is the output result. The specific implementation process is as follows:

[0034] 1. Two-color method to solve the iterative initial value

[0035] The Newton iteration method has certain requirements on the initial value of the iteration, so the initial value needs to be calculated according to the two-color method to avoid unreliable initial values ​​from causing wrong iteration directions. According to Wien's law, the formula for calculating radiation intensit...

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Abstract

The invention discloses a method for measuring flame temperature and emissivity distribution based on spectral radiance intensity. The method comprises the following steps: firstly, acquiring the spectral radiance intensity of flame to be measured by using a spectrometer; solving and taking temperature and emissivity as initial values by using a double-color method according to radiance intensity of two middle wavelengths; solving different order coefficients and temperature to be solved in polynomial relationship that the emissivity changes along with the wavelengths by using a Newton iteration method, increasing the orders of the polynomial relationship from zero step by step, solving the coefficients and the temperature of each order, except that the zero order takes the double-color method result as an initial value, taking the result of a previous order as the initial value for other steps; requiring final result when the solving result does not change along with increase of solving orders, that is, the result is converged along with the change of the orders. By adopting the method disclosed by the invention, the temperature of the flame to be measured and the emissivity distribution of the flame along with change of the wavelength can be obtained according to the spectral intensity of the flame to be measured, the measurement does not depend on assumption or priori conditions, and the result is reliable.

Description

technical field [0001] The invention relates to a method for measuring flame temperature and emissivity distribution, in particular to the technical field of measuring flame temperature and emissivity distribution based on spectral radiation intensity, and belongs to the technical field of flame spectral analysis. Background technique [0002] Radiation heat transfer is one of the three main ways of heat transfer. Radiation-based measurement technology is an important measurement method, especially in high-temperature, dynamic, complex, and high-temperature combustion chambers such as power plant boilers and industrial furnaces. The advantages of radiometric technology are even more significant when measuring objects that do not allow interference and cannot be observed at close range. Radiation energy is a function of emissivity and temperature, how to calculate these two parameters from radiation energy is a problem we want to solve. Many scholars have conducted research ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01J3/28G01J5/60
Inventor 周怀春柳华蔚齐朝博郑树周远科
Owner TSINGHUA UNIV
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