光学学报, 2013, 33 (11): 1112003, 网络出版: 2013-10-20   

基于图像拼接的空冷凝汽器散热面温度场测量

Image-Matching-Based Temperature Field Measurement of Heat Dispersing Surface of Air-Cooled Condenser
作者单位
北京航空航天大学仪器科学与光电工程学院精密光机电一体化技术教育部重点实验室, 北京 100191
摘要
空冷凝汽器散热面温度场测量是研究空冷凝汽器换热机理和传热特性的基础。提出一种基于图像拼接的空冷凝汽器散热面温度场测量方法。利用四台红外热像仪对散热面纵向进行拍摄,通过移动清洗支架对其横向进行拍摄,得到124幅具有重叠区域的红外子图像。对子图像进行几何畸变校正,并消除辐照度不均衡影响。以基管中心为特征,利用灰度投影的相位相关算法进行图像配准,获得散热面的完整配准图像,最大配准误差为1 pixel。基于拼缝处有限行或列的灰度均值对已配准图像进行平滑处理,获得的连续温度场图像的最大空间分辨率较单幅图像提高了4倍,每个像素对应的散热面尺寸为12 mm,测温精度达到±0.4 ℃,可为优化空冷机组运行提供准确全面的空冷凝汽器温度分布信息。
Abstract
Measurement of the temperature field of heat dispersing surface of air-cooled condenser (ACC) is the basis of researching its heat transfer mechanism and characteristics. An image-matching-based temperature field measuring method is presented. Four infrared thermal imagers are used to photograph the longitudinal range, while the horizontal range is photographed by moving cleaning stand. 124 infrared images with overlay area are photographed. Geometric distortion correction is applied to the infrared images, and irradiance imbalance is removed. Characterized by centers of base tubes, the phase correlation algorithm based on gray projection is used for registration. Entire registered image is obtained with registration error less than 1 pixel. Then, based on the average grayscale of limited numbers of rows or columns in joint seams, the registered image is smoothed. Continuous temperature field image of the overall heat dispersing surface can finally be obtained with the maximum spatial resolution four times higher than that of a single image. Each pixel represents 12 mm on the surface, and a temperature measurement accuracy of ±0.4 ℃ is achieved. Comprehensive and accurate temperature distribution information of ACC can be provided by this method for the operation optimization of air-cooling units.
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陈路路, 李小路, 贺涛, 徐立军. 基于图像拼接的空冷凝汽器散热面温度场测量[J]. 光学学报, 2013, 33(11): 1112003. Chen Lulu, Li Xiaolu, He Tao, Xu Lijun. Image-Matching-Based Temperature Field Measurement of Heat Dispersing Surface of Air-Cooled Condenser[J]. Acta Optica Sinica, 2013, 33(11): 1112003.

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