| 应用四杆靶图像测量热成像系统焦距 |
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| 引用本文： | 孙军月,马冬梅,霍玉波.应用四杆靶图像测量热成像系统焦距[J].红外技术,2006,28(4):220-223. |
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| 作者姓名： | 孙军月 马冬梅 霍玉波 |
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| 作者单位： | 中国科学院长春光学精密机械与物理研究所,吉林,长春,130033 |
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| 摘 要： | 采用实验室中四杆靶红外目标源,使其成像在热成像系统自身的焦面探测器上,采用放大倍率法测量与计算出系统的焦距.由于热成像系统的探测器像元尺寸一般较CCD像元大,为了降低像元尺寸对测量精度的影响,根据误差理论,合理选择四杆靶目标,使其能够达到满意的测试精度.这种焦距测量方法,原理简单直接,测量范围大,对于热成像系统的检测与装调,有着很好的实际应用价值.文中详细分析了影响焦距测量不确定度的因素,焦距的测量扩展不确定度可达到U=0.4%.
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| 关 键 词： | 焦距 四杆靶图像 放大倍率法 热成像系统 |
| 文章编号： | 1001-8891（2006）04-0220-04 |
| 收稿时间： | 2005-09-01 |
| 修稿时间： | 2005-09-01 |
The Focal Length Measurement of Thermal Imaging System by 4-bar Targets |
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| SUN Jun-yue,MA Dong-mei,HUO Yu-bo.The Focal Length Measurement of Thermal Imaging System by 4-bar Targets[J].Infrared Technology,2006,28(4):220-223. |
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| Authors: | SUN Jun-yue MA Dong-mei HUO Yu-bo |
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| Affiliation: | ChangChun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Jilin ChangChun 130033, China |
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| Abstract: | The focal length of a thermal imaging system was assessed by the magnification method using 4-bar targets as infrared objectives. However, the detector pitch is larger than that of CCD detector and limits the measurement accuracy. In order to improve the accuracy, appropriate 4-bar targets are chosen according to academic calculation. The uncertainty effects in measurement was analyzed and the uncertainty in measurement can reach U = 0.4%. |
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| Keywords: | Focal length 4-bar image Magnification method Thermal imaging system |
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