The use of pulse-compression thermography for detecting defects in paintings
The use of pulse-compression thermography for detecting defects in paintings
复制标题
DOI：
10.1016/j.ndteint.2018.05.003
复制
发表时间：
2018-09-01
影响因子：
4.2
通讯作者：
Ricci, M.
中科院分区：
文献类型：
--
作者：
Laureti, S.;Sfarra, S.;Ricci, M.
人们对保护绘画的兴趣逐年增长。它们的定期检查对于它们的长期保存是必不可少的。热成像无损检测是一种对绘画有用的技术，但它必须能够在最小化热刺激水平的同时检测到埋藏的缺陷。本文描述了一种脉冲压缩红外热成像技术，该技术可以优化缺陷检测，同时最小化温度的升高。为了完成这项任务，由基于线性调频啁啾信号的编码波形驱动的LED灯已被用于木制面板和帆布层的绘画上。这些标本含有人为制造的缺陷。尽管每种涂层的物理条件不同，但实验结果表明，所提出的信号处理程序能够使用低温对比度检测缺陷。
Interest in the conservation of paintings grows year by year. Their periodic inspection is essential for their conservation over the time. Thermographic non-destructive inspection is one technique useful for paintings, but it is essential to be able to detect buried defects while minimising the level of thermal stimulus. This paper describes a pulse-compression infrared thermography technique whereby defect detection is optimized while minimising the rise in temperature. To accomplish this task, LED lamps driven by a coded waveform based on a linear frequency modulated chirp signal have been used on paintings on both a wooden panel and a canvas layer. These specimens contained artificially fabricated defects. Although the physical condition of each painting was different, the experimental results show that the proposed signal processing procedure is able to detect defects using a low temperature contrast.