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{{OR/15/057}}
Riegl Terrestrial Laser Measuring Systems are designed for the automatic and manual medium- to-long range capture of digital data for terrain modeling. The LPM scanning system (Figure 1) comprises a laser distance-measuring device mounted on a Pan and Tilt mechanism that rotates 360 degrees around the mounting axis and scans 150 degrees vertically to provide almost total coverage. The VZ scanning system (Figure 2) is a single-axis device that rotates 360 degrees but is limited to 100 degrees scanning arc.
<center>
<div><ul>
<li style="display: inline-block;"> [[File:OR15057fig1.jpg|thumb|left|400px|'''Figure 1'''    LPM-i800HA. ]] </li>
<li style="display: inline-block;"> [[File:OR15057fig2.jpg|thumb|right|262px|'''Figure 2'''    VZ-1000. ]] </li>
</ul></div>
</center>

Both scanning systems are pulse range-finding lasers, incorporating a signal processing unit, a transmitter and a receiver (Figure 3). The scanners are easily attached to a standard survey tribrach and tripod for field usage. The scanning systems are linked via a serial (LMP-2K) or ethernet (LPM-i800HA, VZ-1000) cable to a laptop to enable capture of the digital data.

[[Image:OR15057fig3.jpg|thumb|center|500px| '''Figure 3'''    Laser Scanning system. ]]

==Concept==
* ‘Time-of-flight’ method
* Near-infrared wavelength
* Pulsed diode laser transmitter
* Sensitive narrow-band optical receiver
* Single pulse or multiple pulse signal detection
* Microprocessor-based post-processing and interfacing

==Advantages==
* Small size
* High reliability
* High interference immunity
* High accuracy
* Long range
* Quick data acquisition
* Highly collimated measuring beam

==Reduction of the maximum range==
* Very bright daylight
* Bad visibility
* Dirty or dusty front lenses
[[Category:OR/15/057 Ground-based geomatic surveys at the BGS - a manual for basic data collection & processing (2015) | 04]]

OR/15/057 Principles of laser range finding - Revision history

Dbk: 1 revision imported

Ajhil at 13:04, 11 October 2018