The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences
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Articles | Volume XLIII-B2-2021
Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci., XLIII-B2-2021, 689–692, 2021
https://doi.org/10.5194/isprs-archives-XLIII-B2-2021-689-2021
Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci., XLIII-B2-2021, 689–692, 2021
https://doi.org/10.5194/isprs-archives-XLIII-B2-2021-689-2021

  28 Jun 2021

28 Jun 2021

STRICT GEOMETRIC CALIBRATION OF AN UNDERWATER LASER TRIANGULATION SYSTEM

H. Sardemann, C. Mulsow, and H.-G. Maas H. Sardemann et al.
  • Institute of Photogrammetry and Remote Sensing, Technische Universität Dresden, Germany

Keywords: Triangulation, Laser line, Underwater Photogrammetry, Calibration

Abstract. This paper will describe a novel approach for the calibration of an underwater laser triangulation system. Underwater triangulation systems, consisting of a line laser and a camera can be used to determine the geometry of submerged objects or the topography of a water body bottom. Placing camera and laser line projector inside a waterproof housing leads to refraction effects at the air-glass-water interfaces, both of the laser light-sheet and image rays. This implies a deformed laser plane in the water and a curved line on the object surface. The proposed approach strictly models the geometry between camera, laser and housing. First experiments show, that the calibration method can be applied for water depth measurements with accuracies of 0.2–0.3 mm at depths in the order of 100 mm.