Optical measurement for hollow electromagnetic waveguides - arranges axis of beam from light source with intersecting lines to be perpendicular to guide flange face

摘要

An optical measurement device for cylindrical hollow conductors for electromagnetic waves is designed to reduce flange location errors w.r.t. its angle to the axis of the conductor. Deviation of the flange face from an angle perpendicular to the axis leads to losses in the conductor. A holder (3) at one end (2) of the hollow guide (1) contains a light source (4) with intersecting lines (5) at the axis so arranged that the axis of the light beam (6) is perpendicular to the flange face (2). The intersecting lines (5) are reproduced via a lens system (7) on a ground glass plate (8) at the other end of the guide. Deviation of the axial cross image (10) from the centre point (11) gives a measure of the flange misalignment.