Capital investment in equipment for measuring complex objects

用于测量复杂物体的设备的资本投资

• 批准号: ST/X004945/1
• 负责人: Guoyu Yu
• 金额: $ 12.96万
• 依托单位: University of Huddersfield
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2022
• 资助国家: 英国
• 起止时间: 2022 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=ST%2FX004945%2F1
• 关键词: Capital; investment; equipment; measuring; complex

We propose to procure a high-end portable laser tracker for measuring surface geometry, profile and spatial coordinates. This equipment will be of vital importance in supporting the metrology of large aspherical telescope mirrors and provide a large dynamic range method in measuring complex shape objects. It will greatly enhance the speed of R&D in our two awarded STFC-IPS projects and enhance UK capability to meet the instrumentation requirements of the British and International Science Base. This equipment has a wide range of applications across astronomical optics, Infrared and X-ray optics, high-power laser system, head-up displays, synchrotron optics and medical instruments. The first project that will be supported by this equipment addresses the challenge of polishing soft metal mirrors (aluminium) that can be used for ground-based and space astronomy. The second project deals with hard materials such as moulds and dies in tool steels, used for industrial mass production. The parts can also be additively manufactured. Our industrial partner Wayland Additive with NeuBeam technology can provide components of complex shape in a wide range of materials. The key procedure in advanced manufacturing is metrology. Off the shelf products, such as interferometers, can measure optical surface at nano-meter level accuracy, but they require strict working environments and are of low dynamic range. We found the main challenges in measuring complex surfaces at manufacturing stages are the requirements for large dynamic range and a stabilised environment, especially for large aperture (diameter > 1 meter) optics where complicated support make it more challenging to measure. Deflectometry has previously been used as a quality control measure for low precision measurement until the introduction of phase-measuring technology. The College of Optical Science of Arizona University has demonstrated this technology on a large deformable mirror and achieved 0.2 microns accuracy. The primary function of the equipment will be to accurately calibrate the positions of multiple parts of the system (PC screen, camera, mirror) in a space. A laser tracker is the most direct and precise way of achieving such accurate calibration.The second project is to process moulds and dies made of hard materials. Apart from refining rough surface conditions from the previous stage of manufacturing, there is an increasing demand for repairing worn moulds and dies through polishing. Since the working conditions vary, it is likely that these tools are not evenly worn. It is important that metrology can reflect the true surface geometries. A laser tracker with suitable probe and kinematic mount is well suited to this purpose. The equipment we have identified has both of economic and versatility advantages. It has dynamic 6 degrees of freedom and an accuracy of 16 microns within 35m range. We will achieve a better than 50nm accuracy on deflectometry if we use this laser tracker to assist intrinsic and extrinsic calibration. Secondly, the quote we have obtained includes extensive accessories to enable us not only to cope with challenging coordinate measurement situations where many places are either not easy to reach or not able to touch, but also offer us fast and accurate real-time tracking. The latter function will enable us to record polishing robots or even high-end computer numerically controlled (CNC) polishing machine's coordinate information. These data will help us to develop a deeper understanding of the polishing process and analysis and maintain a leading edge in this area.

我们建议采购高端便携式激光跟踪仪，用于测量表面几何形状、轮廓和空间坐标。该设备将在支持大型非球面望远镜反射镜的计量方面发挥至关重要的作用，并为测量复杂形状的物体提供大动态范围的方法。这将大大提高我们两个获奖的STFC-IPS项目的研发速度，并提高英国满足英国和国际科学基地仪器要求的能力。该设备在天文光学、红外和X射线光学、高功率激光系统、平视显示器、同步加速器光学和医疗仪器等领域有着广泛的应用。该设备支持的第一个项目将解决抛光可用于地面和空间天文学的软金属镜（铝）的挑战。第二个项目涉及用于工业大规模生产的模具钢等硬质材料。这些部件也可以增材制造。我们的工业合作伙伴Wayland Additive采用NeuBeam技术，可以提供各种材料的复杂形状部件。先进制造的关键环节是计量。现成的产品，如干涉仪，可以测量光学表面在纳米级的精度，但他们需要严格的工作环境和低动态范围。我们发现，在制造阶段测量复杂表面的主要挑战是对大动态范围和稳定环境的要求，特别是对于大孔径（直径> 1米）光学器件，复杂的支撑使测量更具挑战性。在引入相位测量技术之前，偏折术以前一直被用作低精度测量的质量控制措施。亚利桑那大学光学科学学院已经在大型变形镜上演示了这项技术，并达到了0.2微米的精度。该设备的主要功能是精确校准系统多个部件（PC屏幕、摄像头、镜子）在空间中的位置。激光跟踪仪是实现这种精确校准的最直接和最精确的方法。第二个项目是加工由硬质材料制成的模具。除了改善制造前一阶段的粗糙表面状况外，对通过抛光修复磨损模具的需求日益增加。由于工作条件不同，这些工具很可能磨损不均匀。重要的是，计量可以反映真实的表面几何形状。具有合适的探头和运动安装的激光跟踪仪非常适合此目的。我们所确定的设备具有经济性和通用性的优点。它具有动态6个自由度，在35米范围内的精度为16微米。如果我们使用这种激光跟踪仪来辅助内部和外部校准，我们将在偏转测量上实现优于50 nm的精度。其次，我们获得的报价包括广泛的附件，使我们不仅能够科普具有挑战性的坐标测量情况，其中许多地方不容易到达或无法触摸，而且还为我们提供快速准确的实时跟踪。后者的功能将使我们能够记录抛光机器人甚至高端计算机数控（CNC）抛光机的坐标信息。这些数据将帮助我们更深入地了解抛光工艺和分析，并在该领域保持领先优势。