Geodetic rod comparation on the developed bench with multi-element photorecievers
There are several methods of levelling rods calibration. It depends on rod type. Invar rods are used with high accuracy levels in levelling of I and II classes. They have high accuracy of streak drawing - 0,1 mm/m. The invar rods are calibrates with horizontal or vertical interferometer bench. All other levelling rods are calibrates with control line - metal 1m line with two lenses. The author of article offers new method of levelling rods calibration on developed bench with multi-element photorecievers. The method is described on checker rod calibration example. It based on constancy position of camera matrix pixels which used as measurement scale. In article describes developed bench, it’s elements and the measurement method, some sources of measurement method mistakes. Compared three different methods of rods calibration: on horizontal interferometer bench, with control line and authors method. The offered method can be already used for calibration of checkers rods for III and IV levelling classes with standard deviation lower than 0,02 mm.