Abstract
The laser interferometers for angle measurement in a wide range have been presented. These are the systems based on the modified Twyman-Green interferometer principle, constructed and tested by the author. Each modification is aimed at the optimum configuration, which should combine high accuracy and wide range simultaneously. Starting with the simple interferometer, through its various versions with beam shift compensation and diametrically placed reflectors, to the set-up which has a measuring range of 2π rad and rotational positioning of 0.04″. The final system is designed for automatic measurement of angular positions and for checking the angle standards. The error analysis common to all interferometers with rotating reflector is given.
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