Beside the geometry control unit specialists of SME TEC have developed a rail dimensional measurement system. Operating principle of measurement system is based on continuous rail measurement on specified length with optical proximity sensor of non-contact type.

The structure of the measurement system consists
of 3 measuring frames with sensors installed thereon. Measuring frames are to be mounted on vibration absorbing foundation. Measurement sensors are spaced at 1500 m from each other.

Rail dimensional measurement system.
X1, X2, X3 – optical displacement sensors for straightness measurement in horizontal plane.
Z1, Z2, Z3 – optical displacement sensors for straightness measurement in vertical plane.
S1 – rail position sensor at measuring point (incremental encoder).
Distance L = 1.5 m SP - 2D-camera (geometry tool).