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Quantitative Comparison of Thermographic Data Sequences

机译：热成像数据序列的定量比较

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摘要

Acceptance of thermography for nondestructive testing (NDT) has grown considerably in the past few years. In a typical implementation scenario, the inspector evaluates results visually in order to determine whether or not a repair is required or a part is acceptable. In online quality and process control applications, this approach is too slow, too subjective and not sensitive enough to be practical. In manufacturing, it is often necessary to automate the test process and compare a part to a discontinuity free "gold standard" sample, in order to make, an instantaneous accept/ reject decision or adjust process parameters. In such cases, a part may be rejected because of structural, compositional or cosmetic irregularities. The issue is not whether a sample is good or bad, but whether or not it is identical to the master. Conventional thermographic analysis techniques can be difficult to apply in this situation, as direct comparison of entire image sequences is required. However, sequence comparison can be simplified, and even automated, by reducing an entire thermographic time sequence to a single fingerprint image, which is rotationally and translationally invariant and immune to shot to shot energy variations, ambient temperature variations and other common thermographic artifacts. Keywords: thermography, nondestructive, reconstruction.
机译：在过去几年中，热成像技术用于无损检测（NDT）的接受度已大大提高。在典型的实施方案中，检查人员以视觉方式评估结果，以确定是否需要维修或可接受的零件。在在线质量和过程控制应用程序中，此方法太慢，太主观并且不够实用。在制造中，通常需要使测试过程自动化，并将零件与无不连续性的“金标准”样品进行比较，以便做出即时的接受/拒绝决定或调整过程参数。在这种情况下，由于结构，成分或外观上的不规则性，零件可能会被拒收。问题不是样品好坏，而是样品是否与原样品相同。在这种情况下，传统的热像分析技术可能很难应用，因为需要直接比较整个图像序列。但是，通过将整个热成像时间序列缩减为单个指纹图像，可以简化甚至自动进行序列比较，该指纹图像在旋转和平移方面都是不变的，并且不受每次发射的能量变化，环境温度变化和其他常见的热成像伪影的影响。关键词：热成像，无损，重建。

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