Active infrared imaging is one of the promising remote and whole field characterisation techniques for non-destructive testing and evaluation of various solids irrespective of their electrical and magnetic prosperities. This technique relies on a mapping of thermal response for a predefined incident heat flux over the test object to detect the presence of surface and subsurface anomalies. Due to its fast, non-contact, safe and quantitative testing capabilities, infrared thermography has gained significant importance in the testing of fibre reinforced polymers. This Letter highlights testing and evaluation of glass fibre-reinforced polymer (GFRP) specimen for detection of subsurface hidden defects using pulse compression favourable thermal wave imaging techniques (for an imposed digitised chirp as well as a 7-bit Barker coded modulated heat fluxes over the test specimen). Further depth scanning capabilities of the proposed schemes have been compared using a time-domain pulse compression based approach. Proposed analytical, as well as simulation studies, have been validated with the experimental results on GFRP material having flat bottom holes as defects.

中文翻译：

---

脉冲压缩有利的热成像方法用于表征玻璃纤维增​​强聚合物的研究

主动红外成像是一种有前景的远程和全场表征技术，可用于各种固体的无损检测和评估，无论其电和磁性能如何。此技术依赖于测试对象上预定义的入射热通量的热响应映射，以检测表面和次表面异常的存在。由于其快速，非接触，安全和定量的测试能力，红外热成像技术在纤维增强聚合物的测试中已变得非常重要。这封信重点介绍了使用脉冲压缩有利的热波成像技术对玻璃纤维增​​强聚合物（GFRP）标本进行检测和评估，以检测表面下的隐藏缺陷的方法（适用于数字化线性调频以及7位Barker编码的调制热通量）。测试样本）。已经使用基于时域脉冲压缩的方法比较了所提出方案的进一步的深度扫描能力。拟议的分析和仿真研究已通过具有平坦底孔作为缺陷的GFRP材料的实验结果得到验证。