Operation of a pulsed Laser Distance Meter

An electrical pulse generator periodically drives a semiconductor laser diode sending out infrared light pulses, which are collimated by the transmitter lens. 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 the transmitted and received pulses is counted by means of a quartz-stabilised clock frequency.

The calculated range value is fed into the internal microcomputer which processes the measured data and prepares is for range (and speed) display as well as for data output.

The instruments of series LD90-3 allow the choice between different data processing programs, according to the prevailing conditions and requirements.

Information contained herein is believed to be accurate and reliable. However, no responsibility is assumed by RIEGL for its use. Technical data are subject to change without notice.

RIEGL General Information GI002 (10/94)

Back to Principle of a Pulsed Laser Sensor

Back to Home Page

Last updated 05/23/02