Measurement technology

The instrument is equipped with a distance unit, which is capable of working in different modes. This means that the instrument can measure in prism mode, direct reflex (DR) and in scanning mode.

Distance measurement technology

The EDM is a pulsed laser distance unit that determines distances by precisely measuring the time of flight of the transmitted light pulse. The distance unit generates a short laser pulse, which is transmitted through the telescope to the target. The pulse reflects off the target surface and returns to the instrument where the unit determines the time difference between the transmitted pulse and the received pulse. The unit uses the time difference to calculate the distance to the target.

Scanning technology

During scanning the EDM is in scanning mode. The instrument measures distances and angles while turning around the horizontal and vertical axis to sweep over the selected area. A third axis is added with a rotating prism in the measuring beam’s optical path. The rotating prism deflects the measuring beam to increase the speed with which the laser beam moves over the scanned area. This technology makes it possible to increase the number of measured positions in the scan.