Page 1 of 79
Technical Documentation and
User Instructions
Laser Mirror Scanner LMS-Q280i
1
General
The
Laser Mirror Scanner LMS-Q280i
is a 2D laser scanner based upon
accurately measuring the distance by means of electro-optical pulsed time-of-
flight range measurement and upon fast scanning the laser beam by means of
an opto-mechanical scan mechanism. The high range performance, the fast line
scanning, and the overall system design makes the LMS-Q280i well suited for
airborne laser scanning applications.
1.1 System Configuration
The laser scanner LMS-Q280i consists mainly of two subsystems, an accurate
laser rangefinder electronics and a line scanning mechanism, installed in a
rugged housing.
1.1.1 Rangefinder System
The rangefinder system is based upon the principle of time-of-flight
measurement of short infrared laser pulses.
A laser source emits infrared light pulses, which are collimated by a transmitter
lens system. Via the receiver lens, part of the echo signal reflected by the target
hits a photodiode which generates an electrical receiver signal. The time
interval between transmitted and received pulses is counted by means of a
quartz-stabilized clock frequency. The measured time value is passed to the
internal microcomputer which processes the measured data and prepares it for
data output.
Fig. 1
Measurement principle of the pulsed range finder
