超声CT方法检测古建筑木构件缺陷研究

The use of ultrasonic CT to detect defects in timber structures of historic buildings

为实现建筑木构件裂缝及孔洞的检测,采用自主研发的整套超声CT检测系统,包括非金属超声检测仪、微弱信号放大系统、探头直径转换系统、多探头固定系统和超声CT分析软件。检测中采用干耦合技术,不使用任何耦合剂,避免了耦合剂对木质文物的污染。通过实验室标准试块检测得到了与试块实况吻合的检测结果,并对陕西西岳庙古建筑木构件进行了实地检测,取得了良好的检测效果。

This paper describes a method to detect defects on stone sculptures and timber compoments of ancient architectures with an ultrasonic CT system.This system contains an outside amplifier for weak received signals,a multi-sensor fixing apparatus,and sensor diameter converters.The converters transform the diameter of sensors from 50 mm to 10 mm,to decrease the error caused by inaccuracy of the location of both the transmitters and receivers.No coupling agent is used during the detection,to avoid artificial damage to the detected objects.We analyzed three standard wood samples and obtained the images that correspond to the appearances of the samples.Satisfactory analyses of four pillars of two buildings of Western Mountain Temple were also obtained.