Method of detectors offset correction in thermovision camera with uncooled microbolometric focal plane array
Method of detectors offset correction in thermovision camera with uncooled microbolometric focal plane array
复制标题
非制冷微测辐射热焦平面阵列热视相机探测器偏移校正方法
DOI：
--
复制
发表时间：
2009
期刊：
影响因子：
--
通讯作者：
M. Kastek
中科院分区：
文献类型：
--
作者：
G. Bieszczad;T. Orżanowski;T. Sosnowski;M. Kastek
微测辐射热计是一种非致冷的红外辐射热传感器。在热成像中，使用以称为焦平面阵列（FPA）的阵列组织的微测辐射热计。由于工艺过程，微测辐射热FPA具有不必要的探测器增益和偏移不均匀性。因此，暴露于均匀红外辐射的探测器矩阵产生叠加有固定模式噪声（FPN）的非均匀图像。为了消除FPN，使用非均匀性校正（NUC）算法。阵列中探测器的偏移量取决于焦平面阵列的平均温度。矩阵中的每一个探测器都有其温度漂移，因此每个探测器的特性随温度而变化。为了克服这个问题，通常使用FPA的温度稳定，然而温度稳定是相对功率需求的过程。本文介绍了一种根据阵列平均温度计算和校正阵列中每个探测器的失调的方法。给出了补偿温度特性的估计方法。该方法可用于红外热像仪的非稳微测热焦平面阵列。对ULIS中非晶硅基UL 03 04 1探测器阵列的偏移校正方法进行了研究.
A microbolometer is an uncooled thermal sensor of infra-red radiation. In thermal imaging, microbolometers organized in arrays called focal plane arrays (FPA) are used. Because of technological process microbolometric FPAs features unwanted detector gain and offset nonuniformity. Because of that, the detector matrix, being exposed to uniform infrared radiation produces nonuniform image with superimposed fixed pattern noise (FPN). To eliminate FPN, nonuniformity correction (NUC) algorithms are used. The offset of detector in array depends from mean temperature of FPA. Every single detector in matrix has its temperature drift, so the characteristic of every detector changes over temperature. To overpass this problem, a temperature stabilization of FPA is commonly used, however temperature stabilization is a relatively power demanding process. In this article a method of offset calculation and correction for every detector in array in function of mean array temperature is described. The method of offset temperature characteristic estimation is shown. The elaborated method let to use unstabilized microbolometric focal plane array in thermographic camera. Method of offset correction was evaluated for amorphous silicon based UL 03 04 1 detector array form ULIS.