Angle metrology, or the measurement of angles, is important for many science and industry areas where the EU is globally competitive. The ability to measure angles is needed for the measurement of machine geometries such as straightness, flatness and parallelism of surfaces. This is used in industrial applications such as the manufacture of cars and aeroplanes, industrial robots, space missions, and complex scientific applications including the precise measurement of optical surfaces. Current manufacturing demands an ever greater accuracy in measurements and therefore improvements in the devices used to make angle measurements, and in their calibration are needed. However, prior to this project there was a lack of precise calibration and traceability for angle measuring devices, such as autocollimators and angle encoders.
This project has improved traceability for precise angle measurements and achieved the low less than 50 nrad uncertainty demanded for advanced scientific and industrial applications. The project developed novel methods, instruments, and guides, and has provided the foundations for greater accuracy in angle metrology to meet end user requirements for greater precision.