HIGH-PRECISION OPTICAL INSTRUMENT FOR MEASUREMENT OF SHORT DISTANCES

Abstract

There are several methods for measuring short (2 m - 20 m) distances, but to guarantee the value of the standard error about 0.1-0.15 mm is not easy. The author presents in this paper a high-precision optical instrument developed and constructed by the Department of Surveying, Institute of Geodesy, Surveying and Photogrammetry, Technical University, Budapest. The measurement with this instrument is similar to geodetic levelling. but we measure horizontal distances. The distance to be measured is divided into parts each nearly 3 m in length and their connection is provided by a technique similar to geodetic levelling.