RIEGL VQ-840-GL
Series: RIEGL LiDAR scanners for drones
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The RIEGL VQ-840-GL is a topo-bathymetric laser scanner from Austria with a green laser. It is built for manned aircraft and for UAVs, here for heavy multicopters, and measures terrain and shallow water beds in one pass.
The laser works at 532 nm. Green light penetrates water, so this wavelength suits waterbodies, whereas infrared scanners end at the water surface. The measurement rate is selectable at 50, 100 or 200 kHz, and the point rate is up to 200,000 per second. The scan pattern is elliptical. Penetration is 1.7, 1.8 and 2.0 Secchi depths at 200, 100 and 50 kHz: the lower the rate, the deeper the beam reaches. The Secchi depth is the depth at which a white disc in the water is no longer visible, a measure of clarity. The minimum distance to the target is 20 m. Accuracy is 20 mm, precision 15 mm. An inertial navigation system (INS) is optional.
Green lasers endanger eyes: a safety distance applies, which the manufacturer states (nominal ocular hazard distance, standard IEC 60825-1), and operation needs matching safety precautions. Surveys of waterbodies often touch protected areas and the rights of third parties; flights are frequently in the specific category. Images of built-up shores fall under data-protection law.
The choice of measurement rate decides depth: anyone wanting to measure deep chooses a low rate and accepts fewer points. How deep the beam actually gets depends on turbidity, not on the device. The accuracy of georeferencing hinges on the INS and a rigid mount. Wear points are the scanner window, the optics and the connectors; water and salt call for thorough cleaning after use.
Technical data
Other data
| Field of view | elliptisches Scanmuster (Winkel nicht genannt)correct |
|---|---|
| Horizontal accuracy (cm) | 2correct |
| IMU and GNSS integrated | nocorrect |
| Point rate (per s) | 200,000correct |
| Wavelength (nm) | 532 Nmcorrect |
What to check before buying
- Check the hour meter against the service records — a replaced instrument is the most common gap.
- Compare the data plate and chassis number with the papers.
- Ask about parts availability for this build year — the running costs hang on it.
A general list for this type of machine — no substitute for an inspection or an appraiser.
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