Abit TX5 User's Guide download pdf (Page 8)

1 Introduction

How the laser scanner works

In principle, the TX5 3D laser scanner works by sending an infrared laser beam into the center of its

rotating mirror. The mirror deflects the laser beam on a vertical rotation around the environment

being scanned; scattered light from surrounding objects is then reflected back into the scanner.

To measure the distance, the laser scanner uses phase shift technology, where constant waves of

infrared light of varying length are projected outward from the scanner. Upon contact with an

object, they are reflected back to the scanner. The distance from the scanner to the object is

accurately determined by measuring the phase shifts in the waves of the infrared light.

HYPERMODULATION greatly enhances the signal-to-noise ratio of the modulated signal with the

help of a special modulation technology. The x, y, z coordinates of each point are then calculated by

using angle encoders to measure the mirror rotation and the horizontal rotation of the laser

scanner. These angles are encoded simultaneously with the distance measurement. Distance,

vertical angle and horizontal angle make up a polar coordinate (δ, α, β), which is then transformed

to a Cartesian coordinate (x, y, z). The scanner covers a 360° x 300° field of view.

Trimble TX5 3D Laser Scanner User Guide 8

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Abit TX5 User's Guide Page 8