RIEGL 3D Long-Range Laser Profile Measuring System LPM-321

The Laser Profile Measuring System LPM-321 provides unprecedented flexibility for 3D long range profiling.
Hemispheric scanning, automated or manual operation, reflectorless ranging up to 6000 meters, high accuracy and a comprehensive 3D data acquisition software package operable from any standard laptop or PC are included. Without the use of a retroreflector, the LPM-321 calculates the distance to the surface in question, based upon the time-of-flight measurement of a short laser pulse.

The distance meter comprises state-of-the-art digital signal processing and echo waveform analysis, enabling precise distance measurements even under bad visibility conditions. In multi target situations, the distance meter can provide up to 3 target distances per measurement.

The point of impact of the measuring infrared laser beam can be observed by a telescope. The pan & tilt mount serves to position the measuring beam automatically by integrated stepper motors with an accuracy of 0.009 degrees. Handwheels for manual operation are provided, too.

The optional combination with an oriented and calibrated high resolution digital camera leads to a hybrid sensor system.
This system provides data which lend itself to automatic or semi-automatic processing of scan data and image data to generate products such as colored pointclouds, textured triangulated surfaces or orthophotos with depth information.

The LPM series provides the user with the sophisticated advances of RIEGL laser measuring technology combined with a robust and easy to use design.

Technical Data for LPM-321

Distance Meter Performance:
Max. measurement range (depending on the reflection coefficient ρ of the target) ^{1) 2)}
for natural targets, ρ ³ 80 % ³⁾	³ 1500 m @ measurement rate 1000 Hz ³ 2500 m @ measurement rate 100 Hz 6000 m @ measurement rate 10 Hz
for natural targets, ρ ³ 10 % ³⁾	³ 500 m @ measurement rate 1000 Hz ³ 850 m @ measurement rate 100 Hz ³ 1500 m @ measurement rate 10 Hz

Minimum measurement range	10 m
Measurement accuracy ^{2) 4) 5) 6)}	25 mm
Precision ⁷⁾	15 mm
System measurement rate ⁸⁾	10 to 1000 points/sec.
Laser beam divergence ⁹⁾	0.8 mrad
Telescope	magnification 3 x 20
Laser wavelength	near infrared
Eye Safety Class according to IEC60825-1:1993+A1:1997+A2:2001 The following clause applies for instruments delivered into the United States: Complies with 21 CFR 1040.10 and 1040.11 except for deviations pursuant to Laser Notice No. 50, dated July 26, 2001.	Viewing the laser output with certain optical instruments designed for use at a distance (for example, telescopes and binoculars) may pose an eye hazard.
Full Waveform Mode (logging to internal 2GB memory card)	for up to 2.000.000 measurements

Pan & Tilt Mount Performance:
Scan angle range ¹⁰⁾ vertically horizontally	-20° +130° 0 360°

Angle stepwidth between consecutive laser shots	³ 0.018° (0.02 gon)
Angle stepwidth between consecutive scan lines	³ 0.018° (0.02 gon)
Angular resolution	0.009° (0.01 gon)
Scanning speed vertically horizontally	max. 81° (90 gon) / sec max. 36° (40 gon) / sec

Physical Data:
Main dimensions (L x W x H)	approx 315 x 370 x 445 mm
Weight	approx 16 kg
Protection Class	IP64, dust and splash-water proof
Power supply voltage range	12 - 28 V DC
Power consumption	approx. 23 W (standby), approx. 60 W (both motors in operation)
Data interfaces	Ethernet TCP/IP interface, 10/100 MBit/sec RS422, adjustable baud rate, up to 460.8 kBd, typically 115.2 kBd

Temperature Range:
Operation	0 °C to +45 °C
Storage	-20 °C to +70 °C

Typical values for average conditions. Maximum range is specified for flat targets with size in excess of the laser beam diameter and near to normal incidence of the laser beam. In bright sunlight, the operational range is considerably shorter than under an overcast sky. Not specified for retroreflectors. For extended targets larger than laser footprint size. One sigma standard deviation @ 50 m range under RIEGL test conditions. Plus distance depending error <=± 20 ppm. Accuracy is the degree of conformity of a measured quantity to its actual (true) value. Precision, also called reproducibility or repeatability, is the degree to which further measurements show the same result. The system measurement rate depends on the selcted distance measurement program and is additionally limited by the data trasfer rate from distance meter to PTM and by the maximum speed of the line scan axis. 0.8 mrad correspond to 80 mm increase of beam width per 100 m distance. See dimensional drawings.

Preliminary Data sheet, LPM-321, 15/01/2008

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.

General

Technical Data for LPM-321

Distance Meter Performance:

Pan & Tilt Mount Performance:

Physical Data:

Temperature Range: