Temperature Measurement Method of Flame Image Fusion with Different Exposures
Temperature Measurement Method of Flame Image Fusion with Different Exposures
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DOI：
10.3390/en13061487
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发表时间：
2020-03-01
期刊：
影响因子：
3.2
通讯作者：
Kong, Ming
中科院分区：
文献类型：
--
作者：
Shan, Liang;Huang, Huiyun;Kong, Ming
固定曝光会导致CCD采集的火焰辐射图像曝光不足或曝光过度，对测温精度有很大影响。提出了一种基于多曝光图像融合的温度测量方法，该方法可以消除欠曝光和过曝光对温度测量的影响。该方法首次获得了一组不同曝光条件下的火焰辐射图像。然后通过分割得到辐射图像中曝光效果较好的部分区域，利用该区域拼接得到完整的火焰图像。建立了一套黑体炉双色测温参数标定实验系统。得到了曝光时间与单色灰度的关系，温度与测温系数的关系。以蜡烛火焰为测量对象，采用本文提出的方法获得了完整、准确的火焰温度分布。实验结果表明，与采用单次曝光时间进行温度测量相比，该方法能有效避免欠曝光和过曝光引起的测量误差，提高测量精度。
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.