Not many things were known about its previous history. And experiments have shown its efficiency and accuracy.Īn eighteenth century travelling theodolite.Īn old topographic compass displayed in a showroom of the Museu de Astronomia e Ciências Afins (MAST), in Rio de Janeiro, Brazil, took our curiosity namely because of its resemblance to a theodolite, described by J.H. A simple two-step process, calibration for intrinsic parameters and for extrinsic parameters, is proposed by the novel method. Thus this paper introduces a novel calibration method for non-orthogonal shaft laser theodolite measurement system to simplify the procedure and to improve the calibration accuracy.
So the calibration method for traditional theodolite is no longer suitable for N- theodolite, while the calibration method applied currently is really complicated. And the difference between N- theodolite and traditional theodolite is obvious, since the former one with no orthogonal and intersecting accuracy requirements. According to naming conventions in traditional theodolite, rotary axes of two rotary tables are called as horizontal axis and vertical axis, respectively, and the collimated laser beam is named as sight axis. There are three axes for an N- theodolite. Non-orthogonal shaft laser theodolite (N- theodolite) is a new kind of large-scale metrological instrument made up by two rotary tables and one collimated laser.
Wu, Bin, E-mail: E-mail: Yang, Fengting Ding, Wen [State Key Laboratory of Precision Measuring Technology and Instruments, Tianjin University, Tianjin 300072 (China) Xue, Ting, E-mail: E-mail: [College of Electrical Engineering and Automation, Tianjin Key Laboratory of Process Measurement and Control, Tianjin University, Tianjin 300072 (China) Ī novel calibration method for non-orthogonal shaft laser theodolite measurement systemĮnergy Technology Data Exchange (ETDEWEB) The theoretical principles on which they are based have been known for a long time, but. An ETIS consists of two or more electronic theodolites and a computer, with peripheral hardware and suitable software. The development of electronic surveying instruments, such as electronic theodolites, and concurrent advances in computer technology, has revolutionised engineering surveying one of the more recent examples being the introduction of Electronic Theodolite Intersection Systems (ETISs). Electronic theodolite intersection systems
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