Abstract

Because of the improvement of carrying capability and speed, the railway train has a higher and higher demand for the rail's straightness in high speed and heavy load. The ideal long-distance railway should be regarded as an ideal circular arc guide-rail. Several data transferring sites along the ideal datum line while using linear datum to demarcate the railway are introduced, and adopting non-diffraction laser beam as collimating datum between each site is also used. PSD is used as photoelectric receiving detector, and a non- diffraction beam is used to improve the collimating precision.

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