Work Packages

The project consists of four technical, one creating impact and one management workpackage. The interaction between the workpackages and summary of the technical workpackages are given below.


Workpackage 1 will perform investigations of autocollimators (versatile instruments for the precise and contactless measurement of angles of reflecting surfaces) under challenging measuring conditions and develop ray-tracing models for new generation devices. 2D autocollimator calibration facilities (for spatial angles, in contrast to plane angles) will be developed for the first time worldwide.

Workpackage 2 will study the application of autocollimators to the form measurement of optics for synchrotron radiation beamlines and FEL which relies on autocollimator-based surface profilometers. Advancing the limits of form measurement advances the manufacturing limits of precision optics by state of the art surface modification technologies. WP2 relies on the results of WP1. Conversely, output of WP2 may feed back to WP1, as both WPs complement each other.

Workpackage 3 will investigate errors sources in angle encoders, (instruments for the precise measurement of rotation angles) to advance encoders, their calibration facilities, and their performance in the industrial applications. WP3 will also provide the traceability for autocollimators in WP1 and WP2 with the required uncertainties by use of the sub-division of the full circle which serves as a natural standard of 2 ? rad.

Workpackage 4 will develop angle generation mechanisms for the dissemination of the derived SI unit ' radian ', realised as a ' ratio of two lengths '. The focus will be on achieving extremely challenging improvements in their performance such as nanoradian (nrad) uncertainty and sub-nanoradian sensitivity values by use of various methods, the development of portable and cost-effective angle generators for autocollimator calibration in WP1, and using the advantages due to combination of angle interferometers with angle encoders as hybrid devices.