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首页> 外文会议>Conference on Infrared Materials, Devices, and Applications; 20071112-15; Beijing(CN) >Study on Pulsed Phase Analysis of Depth Measurement for Infrared Thermal Wave Nondestructive Evaluation
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Study on Pulsed Phase Analysis of Depth Measurement for Infrared Thermal Wave Nondestructive Evaluation

机译：红外热波无损评估的深度测量脉冲相位分析研究

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摘要

Pulsed infrared thermal wave nondestructive evaluation has been widely used in various materials' R&D, quality supervise, detection and evaluation. Furthermore, based on pulse infrared thermal wave thermography experiment, a new signal analyze method called pulse phase thermography was introduced by changing the temporal signal to frequency field through Fourier transform. The pulse signal consists of various frequencies information and different thermal wave frequency reaches corresponding depth in the material. According to the relation of thermal wave's frequency to conduction depth, pulse phase thermography method can detect the depth of defects. The intuitionistic thermograph result is the phase information of each pixel in frequency field, through that the defect's size, location can be well distinguished. In order to solve the depth detection, two standard flat bottom holes samples made of aluminum and steel were studied. By analyzing the experimental results, it showed the theoretical depth value and actual depth relations, which can provide an assistant way for subsurface defects detection of material and structure. In that case, given a standard sample with artificial defects, the products made of the same material can be well detected and evaluated. At the same time, corresponding to the pulse infrared thermal wave thermography, phase thermographs with the phase information have higher sensitivity to the defects, and do not influence with the ununiformity of the light heating.
机译：脉冲红外热波无损评估已广泛应用于各种材料的研发，质量监督，检测和评估。此外，在脉冲红外热波热成像实验的基础上，通过傅立叶变换将时间信号转换为频率场，提出了一种新的信号分析方法，称为脉冲相热成像。脉冲信号由各种频率信息组成，并且不同的热波频率到达材料中的相应深度。根据热波频率与传导深度的关系，脉冲相位热成像方法可以检测出缺陷的深度。直观的热像仪结果是频率场中每个像素的相位信息，通过该缺陷可以很好地区分缺陷的大小，位置。为了解决深度检测问题，研究了两个由铝和钢制成的标准平底孔样品。通过对实验结果的分析，表明了理论深度值与实际深度的关系，为材料和结构的表面缺陷检测提供了一种辅助手段。在这种情况下，给定具有人工缺陷的标准样品，可以很好地检测和评估由相同材料制成的产品。同时，与脉冲红外热波热像仪相对应，具有相位信息的相位热像仪对缺陷的敏感性更高，并且不影响光加热的不均匀性。

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