Abstract: The invention relates to a method and a device for determining a return time of a returning light pulse by a Single Photon (SPL) LiDAR scanner, the SPL scanner comprising of a low photon count detector for converting low amounts of photons or single photons to electrical signals, and a control and processing unit for processing the data and for determining the return time of the returning light pulse. The control and processing unit identify detected photons potentially representing a return pulse event and create a return pulse signal based on a criterion involving a temporal probability distribution for the detected photons, identify a rising edge and a falling edge of the return pulse signal, and determine the return time for each return pulse event based on the rising edge and the falling edge of the return pulse signal.

Abstract: An attachment element for assembly on a tubular element including an upper assembly sheet metal which includes in its outer end a transversal, upward directed mounting flange in relation to the assembly sheet metal which includes a cut out geometry, a lower sheet metal, a spacer element which link the upper assembly sheet metal together with the lower sheet metal in its interior ends and the spacer element includes attachment devices provided on both sides of an abutting section of the tubular element. The spacer element includes a wavelike geometry design which form the abutting section and the attachment devices. A galvanized barrel nut barrel nut including a barrel with a first and second interior diameter is also disclosed.

Abstract: A system for compensating for an angle difference between outgoing and incoming beams of a scanner in a long range LiDAR surface scan, the angle difference being dependent of the flight travel time of the beam and of a movement of a deflection unit of the scanner. The scanner consists of a transmitter unit emitting laser pulses, a movable deflection unit directing the laser pulses towards a target surface according to a given scan pattern, a receiver unit, comprising of receiving optics and a photo-sensitive time-of-flight sensor, and a control unit. The receiver unit comprises an active device for compensating for the angle difference between outgoing and incoming laser pulses and the control unit actuates the active device of the receiver unit and calculates a predicted angle difference between outgoing and incoming laser pulses based on a prediction of the time difference between the outgoing and incoming laser pulses.

Abstract: An airborne laser scanner configured to be arranged on an aircraft for surveying a target along a flight path. The airborne laser scanner comprises an emitter configured for emitting a plurality of consecutive laser pulses towards the ground surface, at least one optical element configured for deflecting the laser pulses along pulse paths towards the target, a motor configured for altering the pulse paths by moving the optical element, a receiver configured for receiving the laser pulses backscattered from the target, and a computer configured for controlling the emitter, the motor, and the receiver, for determining directions of the pulse paths, and for triggering the emitter to emit the laser pulses with a varying pulse spacing based on the directional component of the pulse paths in a horizontal direction perpendicular to a direction of the flight path.

Abstract: A system for compensating for an angle difference between outgoing and incoming beams of a scanner in a long range LiDAR surface scan, the angle difference being dependent of the flight travel time of the beam and of a movement of a deflection unit of the scanner. The scanner consists of a transmitter unit emitting laser pulses, a movable deflection unit directing the laser pulses towards a target surface according to a given scan pattern, a receiver unit, comprising of receiving optics and a photo-sensitive time-of-flight sensor, and a control unit. The receiver unit comprises an active device for compensating for the angle difference between outgoing and incoming laser pulses and the control unit actuates the active device of the receiver unit and calculates a predicted angle difference between outgoing and incoming laser pulses based on a prediction of the time difference between the outgoing and incoming laser pulses.

Abstract: A method and a hybrid 3D-imaging device for surveying of a city scape for creation of a 3D city model. According to the invention, lidar data is acquired simultaneously with the acquisition of imaging data for stereoscopic imaging, i.e. acquisition of imaging and lidar data in one go during the same measuring process. The lidar data is combined with the imaging data for generating a 3D point cloud for extraction of a 3D city model, wherein the lidar data is used for compensating and addressing particular problem areas of generic stereoscopic image processing, in particular areas with unfavourable lighting conditions and areas where the accuracy and efficiency of stereoscopic point matching and point extraction is strongly reduced.

Abstract: The invention relates to a method and a device for determining a return time of a returning light pulse by a Single Photon (SPL) LiDAR scanner, the SPL scanner comprising of a low photon count detector for converting low amounts of photons or single photons to electrical signals, and a control and processing unit for processing the data and for determining the return time of the returning light pulse. The control and processing unit identify detected photons potentially representing a return pulse event and create a return pulse signal based on a criterion involving a temporal probability distribution for the detected photons, identify a rising edge and a falling edge of the return pulse signal, and determine the return time for each return pulse event based on the rising edge and the falling edge of the return pulse signal.