A Method of Measuring the Temperature of Hydrocarbon Flame Based on Color CCD Camera

Abstract

The invention discloses a method for measuring the temperature of a hydrocarbon flame based on a colored CCD camera. According to the method, the temperature measurement range of a measured object is not limited by a blackbody furnace calibration experiment, and a blackbody furnace is not used. The method comprises the following steps: (1) photographing the hydrocarbon flame, namely setting parameters of the colored CCD camera, and photographing the flame; (2) acquiring a relation curve between the temperature and a specific value of original strengths of two base colors, namely acquiring a relation curve between the temperature and a specific value of the original strengths recorded by channels R, G and B; (3) acquiring R, G and B true color images, namely outputting RAW format images from the colored CCD camera, and finally converting the RAW format images into the R, G and B true color images; (4) acquiring a specific value of the two base colors, namely acquiring the original strengths of the three channels R, G and B from the R, G and B true color images, and calculating the specific value of the original strengths of the optional two base colors; and (5) acquiring the temperature, namely acquiring the temperature of the hydrocarbon flame according to the obtained relation curve between the temperature and the specific value of the original strengths of the two base colors.

Description

technical field [0001] The invention relates to a method for measuring the temperature of a hydrocarbon flame, in particular to a method for measuring the temperature of a hydrocarbon flame based on a color CCD camera, which is suitable for measuring the temperature of a hydrocarbon fuel flame. Background technique [0002] The hydrocarbon flame temperature is an important parameter of the combustion process. The qualitative and quantitative measurement of temperature plays an important guiding role in observing and understanding the soot production and oxidation process, establishing a suitable combustion model, and realizing efficient and clean combustion. [0003] Temperature measurement methods are divided into contact temperature measurement methods and non-contact temperature measurement methods. The two-color method temperature measurement based on the digital image taken by the CCD camera is a non-contact measurement method, which will not destroy the target tempera...

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Problems solved by technology

[0005] Some temperature measurement methods use optical filters to measure the intensity of monochromatic radiation at different wavelengths (Guo H, Castillo JA, Sunderland P B.Digital camera measurements of soot temperature and sootvolume fraction in axial flames[J].Applied optics,2013, 52(33):8040-8047.), multiple measurements are required, but the flame images obtained by multiple shootings may not be exactly the same, which will bring great trouble to the later data processing, and if the flame occurs during the measurement process If there is no disturbance, the error of the experimental results will be large

[0006] The Chinese patent document with the notification number CN101403639A discloses a temperature image and blackness image detection method of a hydrocarbon flame. The relationship between the flame temperature and the primary color intensity ratio is obtained through blackbody furnace calibration and fitting. However, the blackbody furnace can use The temperature range is small. When the flame temperature is beyond the temperature range of the blackbody furnace, its method cannot prove that the fitting results are still applicable. In addition, the use of the blackbody furnace increases the measurement cost and complicates the operation.

At present, there is no temperature measurement method based on CCD camera that overcomes the above problems at home and abroad.

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