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

doi:10.12068/j.issn.1005-3026.2014.05.001

Journal of Northeastern University Natural Science ›› 2014, Vol. 35 ›› Issue (5): 609-612.DOI: 10.12068/j.issn.1005-3026.2014.05.001

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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
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Abstract

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

CLC Number:

TP21211

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

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