Research of measurement technology of non-orthogonal shaft laser theodolites
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State Key Laboratory of Precision Measuring Technology and Instrument, Tianjin University, Tianjin 300072, China
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Received Date:
2014-08-06
Accepted Date:
2014-09-01
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Abstract
In large size space coordinate measuring system, theodolite measuring system is widely used due to wide measurement range, non-contact measurement and portability. In order to reduce the cost and the error sources of a traditional theodolite measurement system, a novel laser theodolite measurement system based on non-orthogonal shaft system was proposed. Firstly, according to the transform relationship of the non-orthogonal shaft system during the measurement, the orientation mathematical model of visual collimation axis of non-orthogonal shaft laser theodolites was derived. Based on intersection measurement principle of double theodolites,measurement system of non-orthogonal shaft system laser theodolites was built and the coordinates of spatial point were obtained. Finally, after simulation and experiments, the accuracy of measurement model was verified. The experiment results show that, measurement accuracy of spatial point measured with non-orthogonal shafting laser theodolites can achieve 1mm at Pauta criterion within the measurement radius of 3m. The measurement system is especially suitable for the measurement of large volume or large space.
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