Storage tank floor scanner based on pulsed magnetic flux leakage

这项CRD赠款提案的核心是设计和开发脉冲漏磁(MFL)扫描仪，用于对大型室外储罐的钢制底板进行无损评估。这些储罐可能有数千平方米的面积，其内容物任何泄漏到周围土壤或地下水中都可能构成重大的环境危害。我们建议对已在少量实验室实验中尝试过的传统漏磁系统进行扩展：使用由电磁铁供电的“脉冲”系统，而不是使用永磁体的时不变系统。**为了找到新型地板扫描器的最佳配置，将需要广泛的建模。根据初步预测和实验，使用脉冲系统将大大提高用户找到底板(储罐内表面或外部)上任何腐蚀位置的能力，还有助于使该系统适用于具有几毫米厚的保护层的储罐底板的检查。**工业客户实验室Mequaltech(蒙特利尔QC)看到了新系统的巨大潜力，可以满足加拿大和国际上许多工业客户的检查要求。该扫描仪还将有助于保护环境，如果腐蚀威胁到坦克的完整性，它会发出预先警告。

This CRD grant proposal is centered on the design and development of a pulsed magnetic flux leakage (MFL) scanner, for the nondestructive evaluation of the steel floor of large outdoor storage tanks. These tanks may have an area of thousands of square meters, and any leakage of their contents into the surrounding soil or groundwater can pose a significant environmental hazard. We propose to implement an extension to traditional MFL systems that has been tried in a small number of laboratory experiments: use a "pulsed" system powered by electromagnets instead of a time-invariant system that uses permanent magnets.**Extensive modeling will be required in order to find the optimal configuration for the new type of floor scanner. Based on initial predictions and experiments, use of a pulsed system will greatly enhance the user's ability to find the location of any corrosion on the floor plates (inside surface of the tank, or outside), and also help to make the system viable for the inspection of tank floors with a protective coating up to several mm thick.**The industrial customer, Laboratoire d'essai Mequaltech (Montreal QC) sees great potential of the new system for meeting the inspection requirements of many of its industrial customers, both in Canada and internationally. The scanner will also help to protect the environment, by giving advance warning if corrosion threatens a tank's integrity.****