Abstract
Fixed exposure will lead to underexposure or overexposure of collected flame radiation images using CCD, which has a great influence on the temperature measuring accuracy. A temperature measurement method was proposed by image fusion with multi-exposure, which can eliminate the influence of insufficient underexposure and overexposure. The approach was first to acquire a group of flame radiation images during different exposures. Then a partial region with good exposure effect in each radiation image was obtained by segmentation, with which the complete flame image can be spliced together. An experimental system was built to calibrate the temperature measurement parameters by two-color pyrometry through a blackbody furnace. The relation between exposure time and monochromatic gray level, as well as the relation between the temperature and temperature measurement coefficient were obtained. A candle flame was selected as the measuring object and the complete and accurate flame temperature distribution was acquired following our proposed method. The experimental results show that, compared with the temperature measurement using a single exposure time, our method can effectively avoid the measurement error caused by underexposure and overexposure, and improve the measurement accuracy.
Highlights
Flame temperature detection has always been a research hotspot in the combustion field as the temperature can reflect the combustion state and judge, predict and diagnose it
This paper proposes a new image temperature measurement method based on image fusion technology, which is to collect a group of flame radiation images with a color CCD camera during different exposure times, and splice a complete flame image by good exposure of parts of each image, so as to obtain a more accurate temperature distribution
Collecting flame images, which are caused by the great in flame intensity, novel two-dimensional flame which are caused by the great differences in flame radiation intensity, a novel two-dimensional flame temperature distribution measuring method based on image fusion of multi-exposure times is proposed, temperature distribution measuring image fusion of measurement multi-exposure times is which effectively solves the common method problem based in CCDonflame temperature with a wide proposed, which effectively solves the common problem in flame temperature measurement temperature range
Summary
Flame temperature detection has always been a research hotspot in the combustion field as the temperature can reflect the combustion state and judge, predict and diagnose it. With the development of digital image technology in recent years, radiation thermometry based on color CCD has become a hot topic in the research field of temperature measurement [1,2,3,4,5]; it is widely used in scientific research, industrial production and national defense research [6,7,8,9,10,11]. Zhou et al [12,13,14,15] have carried out dozens of experiments on flame temperature detection and proposed a monochromatic method for reference temperature measurement. Compared with the two-color pyrometry, it has Energies 2020, 13, 1487; doi:10.3390/en13061487 www.mdpi.com/journal/energies
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