作者：何莎1,2, 袁宗明1, 喻建胜1,2, 巩艳1, 刘从箐3
作者单位：1. 西南石油大学, 四川成都 610500;
2. 川庆钻探工程公司安全环保质量监督检测研究院, 四川广汉 618300;
3. 西南油气田公司采气工程研究院, 四川广汉 618300
关键词：无损检测; 超声衍射时差法; D扫描; B扫描; 相位; 灰度图; 定位定量
摘要：
描述了超声波衍射时差法的基本原理,讨论了平行扫查(B扫描)和非平行扫查(D扫描)两种扫查方式,研究了波形图和灰度图两种缺陷图谱的相位特征,推导了缺陷精确定位定量的计算公式,并通过标准试块试验对三种典型缺陷进行了图谱分析。研究结果表明,TOFD技术能识别向表面延伸的缺陷,能对缺陷精确定量和定位并且检出率高,检测速度快。该方法在国内无损检测领域将得到广泛应用。
Inspection technique research on time of flight diffraction method
HE Sha1,2, YUAN Zong-ming1, YU Jian-sheng1,2, GONG Yan1, LIU Cong-qing3
1. Southwest Petroleum University, Chengdu 610500, China;
2. Institute of Safety Environment Protect and Quality Surveillance and Inspection, Chuanqing Drilling Engineering Company, Guanghan 618300, China;
3. Gas Production Engineering Research Institute, Southwest China Oil Gas field Company, Guanghan 618300, China
Abstract: Basic principle of time of flight diffraction(TOFD) method was described. Two scan modes D scan and B scan were discussed and the phase characteristic of oscillogram and grey-scale map was also studied. Formula to calculate the location and size of defects was given. The image analysis was carried on three typical defects on standard blocks. The results show that TOFD with the advantages of the high detectable rate and high test speed can tell the defects which are extending to the surface and can fix the location and size of the defects accurately. The TOFD method would be widely used in the NDT field in the future.
Keywords: NDT; TOFD; D scan; B scan; Phase; Grey-scale map; Locating and sizing
2009, 35(3): 104-106,128 收稿日期: 2008-11-5;收到修改稿日期: 2009-1-13
基金项目:
作者简介: 何莎(1980-),女,重庆万州市人,博士,主要从事油气储运天然泄漏及检测技术研究。
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