Practical Application of Photo-acoustic Spectroscopy as NDT for Thermal Sprayed Specimen

热喷涂是一种表面改性技术，由于其相对于其他表面处理方法的优越性，已越来越多地应用于各种工业领域。但是，迄今为止，热喷涂涂层的无损检测（NDT）显然尚未建立起来。本研究的目的是将“光声光谱”作为无损检测技术应用于热喷涂涂层。主要研究结果总结如下：设计并制作了一种适用于固体试样热喷涂涂层的PAS原型仪。采用双光束法或氩激光在光源系统上构建了氙气弧光灯原型仪。声压信号和声压谱是材料厚度、表面粗糙度、孔隙率、键合状态等信息的有效来源。热喷涂涂层。

A Thermal Spraying, one of the surface modification techniques, has been increasingly applied in various industrial fields owing to its advantages over other surface treatment methods. But, the non-destructive testing (NDT) of thermal sprayed coatings has apparently not been established to date.This study has been performed with an objective of applying "Potoacoustic Spectroscopy (PAS)" as NDT to thermal sprayed coatings. The main results are summarized as follows :1. A prototype instrument of PAS was designed and fabricated in order to apply to solid specimens with thermal sprayed coatings. This prototype instrument was constructed from a xenon arc lamp by using double beam method or an argon laser on light source system.2. PA signal and PA spectrum has a good competence for the useful source of the information for the materials, thickness, surface roughness, porosity, structure of bonding state etc. On the thermal sprayed coatings.