以DCVG/CIPS组合检测技术为基础,采用VB与Matlab混合编程的方法,开发了埋地钢质管道外覆盖层缺陷检测和评价系统.详细介绍了软件系统的主要功能模块及实现技术,包括数据存储与查询、缺陷定位、缺陷破损程度评价和覆盖层质量评价等项目.采用小波变换的信号奇异性检测理论,对阴极保护埋地管道通电电位、断电电位和电压梯度检测信号进行处理,实现了覆盖层缺陷点位置的准确定位.提出了基于现场检测数据的覆盖层横向电阻计算方法,建立了基于横向电阻的管道外覆盖层质量状况检测评价系统,并结合工程实践进行了验证.实践表明,该软件操作简便、定位准确、分析评价结果合理,具有一定实用性.

A defect detection and evaluation system of protective coatings for buried steel pipelines based on the combined technique of DCVG and CIPS has been developed by multi-language programming of VB with Matlab.Its main functional modules including data storage and inquiry,defect location,breaking level evaluation,protective coating quality evaluation and other modules as well as their implementation techniques are introduced in detail.The theory of signal singularity detection by wavelet transform was used to process the detection signals of ON potential,OFF potential and voltage gradient,by which the broken position of the protective coating can be located accurately.The lateral resistance computing method of protective coating was put forward based on field detecting data,which was applied to establish the quality evaluation system of protective coating for pipeline.And the engineering tests and verification were carried out.The engineering experience shows that the system is convenient to operate,the defect position is accurate to be located and the result of analysis and evaluation is reliable,which can meet the needs of engineering application.