The laser measuring instrument developed by Beijing Institute of Technology uses XL-80 as the core component to provide high-precision data for the measurement of various parameters of spherical optical components.

In today's world, optical lens assemblies are no longer as widely used as before in industrial applications or daily life. Advanced laser cutting systems, high-resolution photography equipment, and even eyeglasses have become more efficient and compact, reducing the need for complex optical setups. However, as application complexity and precision demands increase, so do the requirements for the accuracy of mirror assemblies—especially spherical mirrors. This has led to a growing need for advanced instrumentation that can measure key parameters with high precision and efficiency. The laser differential confocal interference component parameter measuring instrument, developed by Beijing Institute of Technology (commonly known as Northern Polytechnic), is the first of its kind in the world capable of performing comprehensive, high-precision measurements of spherical optical components. It eliminates the need for multiple instruments, significantly reducing the time and effort required for repeated adjustments when switching between devices. As a core component of Renishaw’s XL-80 series laser interferometer, it provides stable and reliable length measurement data for the system. This innovative measuring instrument is designed to meet specific customer needs, featuring a differential confocal interferometric measuring host, standard lenses, air-floating guides, multi-dimensional adjustment frames, electromechanical platforms, and the Renishaw XL-80 laser interferometer. The system works by emitting a measuring beam to the tested mirror, which is then focused on a standard lens. The lens under test is positioned on an air-floating guide using a multi-dimensional adjustment frame, and the platform moves along the optical axis during measurement. When the beam converges at the apex of the lens, the reflected data is analyzed, while the XL-80 laser collects real-time position data. Professor Zhao Weiqian from the School of Optoelectronics at Beijing Institute of Technology explained: “The key to this technology lies in integrating laser differential confocal measurement with surface interference techniques to create a comprehensive system for measuring spherical mirrors.” This system uses differential confocal positioning to accurately measure curvature radius, focal length, refractive index, thickness, and axial clearance. It also employs multi-turn phase-shifted interferometry for precise surface shape analysis. For example, the curvature radius is determined by locating the apex and center of the measured surface. Thickness and refractive index are calculated by identifying the intersections of the front and back surfaces with the optical axis. Surface shape is measured through interference images processed via phase shift algorithms. Focal length is obtained by locating the focus of the lens, and axial clearance is calculated using ray tracing methods based on the numerical aperture and curvature of each surface. The product offers several advantages over traditional measurement methods. It reduces the need for multiple instruments, lowers costs, and avoids physical contact with the tested components, preserving their integrity. Its non-contact approach simplifies adjustments and eliminates the need for reconfiguring the optical path when measuring new parameters. The system also features a unified traceability system, enhancing data reliability. Key components such as air-floating axes, multi-dimensional worktables, and laser differential confocal masters are independently developed by Beijing Institute of Technology, with numerous national invention patents to its name. The system meets international standards, achieving an accuracy of 0.75 μm when measuring a 5 mm thick mirror assembly. Renishaw’s XL-80 laser interferometer is a critical part of the system, offering exceptional performance and stability. With a linear measurement accuracy of ±0.5 ppm, it supports high-frequency data reading up to 50 kHz and a resolution of 1 nm at high speeds. Its compatibility allows seamless integration with client systems, making it ideal for custom-designed instruments. During development, engineers at Northern Polytechnic integrated real-time data from the XL-80 into their own software using its exclusive dynamic connection library. Professor Zhao noted, “Renishaw’s powerful analysis software, combined with our custom system, gives us greater flexibility. Their after-sales support is also excellent, with engineers who are always willing to discuss technical issues and provide valuable advice.” Overall, the laser differential confocal interference component measuring instrument represents a major advancement in optical component metrology, combining precision, efficiency, and cost-effectiveness in a single device.

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