Case study Spherical optical lenses are a critical component in a wide range of high-resolution industrial and scientific research applications, from imaging systems in the aerospace sector to mask alignment in semiconductor manufacturing. Ensuring the complete accuracy of spherical lens geometries is vital in assuring any system’s image processing quality, with even the slightest error in lens manufacture having a profound impact on system reliability and performance. Beijing Institute of Technology (BIT), China, has used Renishaw’s XL-80 laser interferometer to develop a high precision instrument capable of simultaneously and reliably measuring all the key dimensional parameters of a spherical lens. Background Founded as a public university of science and technology in 1940, B

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