基于小波域的锅炉压力容器压力管道裂纹X射线检测方法

X-ray Detection Method for Cracks in Pressure Pipes of Boiler and Pressure Vessel Based on Wavelet Domain

针对难以获取锅炉压力容器压力管道裂纹细节信息,外界影响因子较多的问题,该文结合小波域理论提出一种裂纹缺陷的X射线检测方法。采用应力分布线性化的分析方法,取得压力管道的裂纹应力情况,根据裂纹应力分析结果与波粒二象性,将X射线的短电磁波看成是高能量的光子束流,设计出X射线检测模型。基于小波理论融合非局部均值滤波算法与双边滤波算法,利用适用于射线底片图像的处理手段,得到裂纹射线检测图像。实验结果表明,面向锅炉不锈钢固定式低温压力容器,主观性的视觉效果与客观性的评价结果均较为突出,获取到更多、更清晰的裂纹细节信息,检测优势较大,图像质量较高,可为压力管道后续的维修与处理提供更可靠的判定依据。

Aiming at the problem that it is difficult to obtain the crack details of boiler pressure vessel pressure pipeline and there are many external influence factors,an X-ray detection method of crack defects is proposed based on wavelet domain theory. The stress distribution linearization analysis method is used to obtain the crack stress of the pressure pipe. According to the crack stress analysis results and wave particle duality,the short electromagnetic wave of X-ray is regarded as a high-energy photon beam,and the X-ray detection model is designed. Based on wavelet theory,non local mean filtering algorithm and bilateral filtering algorithm are fused,and the crack radiographic inspection image is obtained by using the processing method suitable for radiographic negative image. The experimental results show that for the boiler stainless steel fixed low-temperature pressure vessel,the subjective visual effect and objective evaluation results are more prominent,more and clearer crack details are obtained,the detection advantage is greater,and the image quality is higher,which can provide a more reliable judgment basis for the subsequent maintenance and treatment of pressure pipes.