G-LAS a ring laser goniometer for angular metrology

Accurate measurement of angles down to the nanoradian level is required in precision mechanical industry, as well in geodesy, astronomy and experimental physics. G-LAS (GyroLaser Angular Standard) is the new transportable prototype of goniometer, based on a ring laser gyroscope mounted on a precision turntable, that is presently under test in a collaboration between INRIM and INFN. The target is to achieve an accuracy of the order of 10 nrad, being the accuracy of the most precise existing angular encoders at the level of some 100 nrad.