This paper deals with a laser scanning device used in a space-encoding rangefinder. At first the principle of spaceencoding is introduced. And then the error expressions of the rangefinder are given on the basis of establishing its methematica.1 model. Furthermore are deduced the functional relations between the measurement errors and parameters of the laser scanning device as well as errors of the parameters. At last approaches to reduce the measurement errors caused by the laser scanning device are found out according to the above said error expressions and functional relations.
Combining with the characteristics of contactiess sensor and according to the Donaldson principle , the paper puts forward the error separation technique of "two points and two setting method". This technique can not only realize the separation for roundness error of intermediary from rotating error movement of spindle , but also reduce the time of a measuring period and avoid the "drift" error which is brought by measuring system. Besides , according to above error separation technique , the authous of the paper develop a error separation system which can be used in ultra-high--precision contactless roundness measuring instrument. The maximal "drift"value of the system is less than 10 nm.
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