Advanced scanning infrared laser system for dynamic measurements on soft materials

申请人是流体流动激发的机械振动方面的著名专家，这种振动影响对公众至关重要的系统的安全运行;它们可能导致核电站堆芯中裂变材料的释放以及诸如主动脉等人体大动脉的塌陷和相关主动脉移植物的失效。今天，根据传统方法避免共振是不够的，但有必要预测灾难性事件期间达到的振动的严重程度。振动测试需要通过先进的非接触式系统（如扫描激光多普勒测振仪（SLDV））对原型进行精确测量。这些交钥匙系统可以测量整个表面的振动模式形状，非常精确的速度和数千个点的位移。几十年的SLDV经验表明，没有其他技术可以在不同条件下（例如浸入水中）在表面上的数千个点上测量纳米精度的缓慢位移以及每秒数百万次振荡。申请人的主要实验资产现在是一台SLDV，这是麦吉尔大学唯一的一台，在允许不同的研究之后，它已经达到了生命的尽头。单点模型是可用的，但对于价格的一个重要部分，它们只测量一个点，因此它们的时间效率低数百倍。所要求的设备是一个SLDV的替代和改进目前的模式。与旧的相比，它将采用一种新的红外激光技术，允许测量橡胶和生物医学材料等非反射表面。虽然它将复制和改善以前在金属材料上的性能，但它也将是首次实现人体大动脉（例如动脉）离体动态表征的关键因素。该设备紧凑灵活，由于有摄像机，可以直观地瞄准结构，输出直观的动画，也可用于培训目的。它具有基于PC的功能，易于使用且速度极快。因此，任何需要它的研究人员都可以很容易地连续使用它。它坚固耐用，可以毫不拖延地运送到其他地点。它是安全的，所以它可以立即共享，并且在申请人已经监督的四名研究生和两名研究生之间进行很少的培训。SLDV是目前振动测试领域的领先技术，因此实践经验对于任何从事该领域工作的HQP来说都是绝对必要的。拟议中的SLDV将在屏幕上可视化振动对现代生活基础系统的直接影响;它们将改善加拿大公众的安全，并为开发新一代心血管假体和核反应堆堆芯提供必要的数据。因此，HQP在这些行业的学术成就和就业能力将得到极大的促进。

Mechanical vibrations excited by fluid flow, of which the applicant is a renowned expert, affect the safe operation of systems of crucial importance to the public; they may result in the release of fissile material in the cores of nuclear plants as well as in the collapse of large human arteries such as the aorta and in the failure of relevant aortic grafts. Today it is not sufficient to avoid resonances according to traditional methods, but it is necessary to predict the severity of the vibrations reached during catastrophic events. Vibration testing requires the accurate measurement of prototypes by advanced non-contact systems like scanning laser Doppler vibrometers (SLDVs). These turnkey systems can measure the vibration mode shape of entire surfaces in terms of very accurate velocity and displacement of thousands of points. Decades of experience with SLDVs indicate that no other technology measures with nanometer accuracy slow displacements as well as millions of oscillations per seconds on thousands of points on surfaces in different conditions (e.g. immersed in water). The main experimental asset of the applicant is now one SLDV, the only one at McGill University, that, after allowing disparate researches, reached its end of life. Single point models are available, but for an important fraction of the price they measure one point only, thus they are hundreds of times less time effective. The requested equipment is a SLDV that substitutes and improves the current model. Differently than the old one available, it will employ a novel infrared laser technology, allowing the measurement of non-reflective surfaces such as rubbers and biomedical materials. While it will replicate and improve previous performances on metallic materials, it will also be a key factor in allowing for the first time the ex vivo dynamic characterization of large human arteries (e.g. aortas). The equipment is compact and flexible and, thanks to a video-camera, can be aimed intuitively onto structures giving as output intuitive animations, also used for training purposes. It is complete with PC-based capabilities, easy to use and extremely fast. Thus, it is easily and continuously available to any researcher needing it. It is rugged and can be transported to other locations without delay. It is safe, so it can be shared immediately and with little training between four graduate and two post-graduate students already supervised by the applicant. SLDV is by far the leading technology in vibration testing, so hands-on experience is absolutely necessary for any HQP pursuing employment in this field. The proposed SLDV will visualize on screen the direct impact of vibrations on systems at the base of modern life; they will improve the safety of the Canadian public and give data necessary to develop a new generation of cardiovascular prostheses and nuclear reactor cores. Consequently, the academic success and employability of HQP in these sectors will be highly facilitated.