渐晕对面阵CCD高温计精度的影响及校正方法

doi:10.12068/j.issn.1005-3026.2014.05.001

东北大学学报:自然科学版 ›› 2014, Vol. 35 ›› Issue (5): 609-612.DOI: 10.12068/j.issn.1005-3026.2014.05.001

• 信息与控制 • 下一篇

渐晕对面阵CCD高温计精度的影响及校正方法

张育中，胡振伟，孟红记，谢植

(东北大学信息科学与工程学院，辽宁沈阳110819)

收稿日期:2013-07-25 修回日期:2013-07-25 出版日期:2014-05-15 发布日期:2014-08-18
通讯作者: 张育中
作者简介:张育中(1987-)，男，安徽合肥人，东北大学博士研究生;谢植(1957-)，男，辽宁沈阳人，东北大学教授，博士生导师.
基金资助:
国家自然科学基金资助项目(61273178).

Vignetting Influence on Accuracy of Temperature Measurement for CCDbased Pyrometer and Correction Method

ZHANG Yuzhong， HU Zhengwei， MENG Hongji， XIE Zhi

School of Information Science & Engineering， Northeastern University， Shenyang 110819， China.

Received:2013-07-25 Revised:2013-07-25 Online:2014-05-15 Published:2014-08-18
Contact: ZHANG Yuzhong
About author:-
Supported by:
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摘要/Abstract

摘要： 基于面阵CCD(chargecoupleddevice)的高温计由于存在光学系统渐晕，直接测量得到的温度场会发生严重畸变，大大降低了测温精度.因此，根据辐射测温及几何光学理论，建立了基于面阵CCD温度场测量的温度畸变数学模型.分析了光学参数对温度场测量精度的影响，并提出了一种基于图像邻域灰度梯度分布稀疏特性的渐晕系数估计方法.该方法与利用积分球标定方法相比，其渐晕系数估计的最大绝对误差为0052，且其有效性在铸坯表面温度场校正实验中得到了进一步验证.

关键词: 渐晕, 面阵CCD, 温度校正, 邻域灰度梯度, 稀疏性

Abstract: Due to the existence of vignetting in the CCDbased pyrometer， there is serious photometric distortion in temperature field， resulting in the severely decreasing of the temperature measurement accuracy. So， a mathematical model for temperature distortion based on theories of radiation thermometry and geometrical optics was built， and the influence of optical system parameters on the accuracy of temperature field measurement was analyzed as well. Based on the sparsity of neighborhood gray gradient distribution (NGD)， a method for the calibration of vignetting coefficient was also proposed. Compared with the calibration method using a integrating sphere， its maximum absolute error for vignetting estimation is only 0052， and the effectiveness of this calibration method is validated by the experiment of temperature field correction for casting billets.

Key words: vignetting, CCDarea, temperature correction, neighborhood gray gradient, sparsity

中图分类号:

TP21211

张育中，胡振伟，孟红记，谢植. 渐晕对面阵CCD高温计精度的影响及校正方法[J]. 东北大学学报:自然科学版, 2014, 35(5): 609-612.

ZHANG Yuzhong， HU Zhengwei， MENG Hongji， XIE Zhi. Vignetting Influence on Accuracy of Temperature Measurement for CCDbased Pyrometer and Correction Method[J]. Journal of Northeastern University Natural Science, 2014, 35(5): 609-612.

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渐晕对面阵CCD高温计精度的影响及校正方法

Vignetting Influence on Accuracy of Temperature Measurement for CCDbased Pyrometer and Correction Method

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