Non-destructive flaw detection and profiling in paramagnetic materials using QWHE sensors

使用 QWHE 传感器对顺磁材料进行无损探伤和分析

• 批准号: 2323619
• 金额: --
• 依托单位: University of Manchester
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2019
• 资助国家: 英国
• 起止时间: 2019 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2323619
• 关键词: Non; destructive; flaw; detection; profiling

This project aims to develop new methods of electromagnetic Non-Destructive Testing (NDT) using advanced Quantum Well Hall Effect (QWHE) sensors. The focus of this PhD is on developing systems for the imaging of paramagnetic materials using multifrequency field applications, allowing multilayer images of the samples. The underpinning knowledge developed over the course of this PhD will be applicable to real industrial applications such as oil and gas pipe monitoring, and aerospace production.The project currently consists of development of handheld systems for Eddy Current Testing (ECT), both at high frequencies (>100kHz) and low frequencies (<1kHz), along with image processing techniques for multifrequency scan combination. As the project continues, multifrequency field application techniques will also be developed. This will be achieved through a process of electromagnetic modelling, circuit design, electromagnet profiling, and signal/image processing. These general steps apply to any systems to be developed over the course of this PhD. As systems are developed the PhD will also include collection of data in order to characterise the optimal parameters for paramagnetic metal imaging.While standard ECT systems are used in industry, they all use mostly coil based detection, limiting them to the physical size restrictions of their sensors. As coils have a non-linear response to magnetic field, the images produced by coil based ECT systems are often difficult to interpret. In contrast, the high linearity, wide dynamic range, and sensitivity of the QWHE sensors leads them to be excellent for high resolution magnetic imaging and at high frequencies ( > 100kHz) there is the opportunity to integrate the actual coils itself within the semiconductor die leading to extremely compact illumination-sensor probes ( < 0.5x0.5 mm2). The frequency linear response of the sensors also opens the possibility for ECT performed at very low frequencies, allowing for magnetic penetration depths not possible to scan with current methods. Finally, while coils detect magnetic flux confined within their area, their sensitivity is limited by size. In contrast, QWHEs detect magnetic flux density, and as such, they are confined to 3x2mm packages, with the actual sensing area is around 20x20 to 5x5microns in size. This opens possibilities for creating QWHE arrays, potentially leading to real time electromagnetic NDT.The novelty of this is in the potentials for discovering and monitoring flaws and defects that are currently not visible through NDT methods, allowing for a deeper understanding of how metals in industrial use develop flaws over their lifetimes.

该项目旨在使用高级量子井效应（QWHE）传感器开发新的电磁非破坏性测试（NDT）。该博士的重点是使用多频场应用程序开发用于对顺磁性材料进行成像的系统，从而允许样品的多层图像。在该博士学位的过程中发展的基础知识将适用于石油和天然气管监测以及航空航天生产等实际工业应用。该项目目前包括用于涡流测试（ECT）的手持系统的开发，包括高频（> 100kHz）和低频（> 100kHz）和低频（<1KHz），以及图像处理技术，以及多种图像处理技术。随着项目的继续，还将开发多频现场应用技术。这将通过电磁建模，电路设计，电磁体分析和信号/图像处理的过程来实现。这些一般步骤适用于在该博士学位的过程中开发的任何系统。随着系统的开发，博士学位还将包括数据的收集，以表征参数磁性金属成像的最佳参数。尽管在行业中使用了标准ECT系统，但它们都主要使用基于线圈的检测，从而将其限制在其传感器的物理尺寸限制中。由于线圈对磁场具有非线性响应，因此基于线圈的ECT系统产生的图像通常很难解释。相比之下，QWHE传感器的高线性，宽动态范围和灵敏度使它们非常适合高分辨率磁成像，并且在高频（> 100kHz）下，有机会将实际线圈本身整合在半导体中，导致非常紧凑的光发射器探测器（<0.5x0.5 mmm2）。传感器的频率线性响应还打开了以非常低的频率进行的ECT进行的可能性，从而使磁穿透深度无法通过电流方法进行扫描。最后，尽管线圈检测到其区域内的磁通量，但其灵敏度受大小限制。相比之下，QWHE检测磁通量密度，因此，它们仅限于3x2mm的包装，实际感应区域的大小约为20x20至5x5microns。这打开了创建QWHE数组的可能性，有可能导致实时电磁NDT。这种新颖性在于发现和监视当前通过NDT方法不可见的缺陷和缺陷的潜力，从而可以更深入地了解工业中金属在其寿命中如何发展出来的缺陷。