Results 51 to 60 of about 5,678 (254)
Sub-Pixel Scanning High-Resolution Panoramic 3D Imaging Based on a SPAD Array
IEEE Photonics Journal, 2021 3D imaging based on single-photon avalanche diode (SPAD) arrays is of interest in many applications. Limited by the small array size and low fill-factor of the available SPAD array, it is difficult for SPAD array-based lidars to achieve high-resolution ...
Ruikai Xue +4 more
doaj +1 more source
Erosion of granular sediments by submerged impinging jets: Particle size effects and cohesion onset
AIChE Journal, EarlyView.Abstract This study investigates the erosion behavior and modeling of glass particle beds under impinging jet conditions, with a focus on particle size effects and the onset of cohesion. Ultrasonic profiling is implemented to scan and measure static crater profiles.
Ahmad Mohamadiyeh +4 more
wiley +1 more source
Influences of lidar scanning parameters on wind turbine wake retrievals in complex terrain [PDF]
Wind Energy ScienceScanning lidars enable the collection of spatially distributed measurements of turbine wakes and the estimation of wake properties such as magnitude, extent, and trajectory. Lidar-based characterizations, however, may be subject to distortions due to the
R. Robey +3 more
doaj +1 more source
Lidars for Wind Tunnels - an IRPWind Joint Experiment Project [PDF]
, 2017 Measurement campaigns with continuous-wave Doppler Lidars (Light detection and ranging) developed at DTU Wind Energy in Denmark were performed in two very different wind tunnels. Firstly, a measurement campaign in a small icing wind tunnel chamber at VTT
Angelou, Nikolas +11 more
core +2 more sources
Advanced Intelligent Systems, EarlyView.Variational Autoencoder+Deep Deterministic Policy Gradient addresses low‐light failures of infrared depth sensing for indoor robot navigation. Stage 1 pretrains an attention‐enhanced Variational Autoencoder (Convolutional Block Attention Module+Feature Pyramid Network) to map dark depth frames to a well‐lit reconstruction, yielding a 128‐D latent code ...
Uiseok Lee +7 more
wiley +1 more source
Identification of tower-wake distortions using sonic anemometer and lidar measurements [PDF]
Atmospheric Measurement Techniques, 2017 The eXperimental Planetary boundary layer Instrumentation Assessment (XPIA) field campaign took place in March through May 2015 at the Boulder Atmospheric Observatory, utilizing its 300 m meteorological tower, instrumented with two sonic anemometers ...
K. McCaffrey +10 more
doaj +1 more source
Digitalization of scanning lidar measurement campaign planning [PDF]
Wind Energy Science, 2020 By using multiple wind measurements when designing wind farms, it is possible to decrease the uncertainty of wind farm energy assessments since the extrapolation distance between measurements and wind turbine locations is reduced.
N. Vasiljević +3 more
doaj +1 more source
A review of turbulence measurements using ground-based wind lidars [PDF]
, 2013 A review of turbulence measurements using ground-based wind lidars is carried out. Works performed in the last 30 yr, i.e., from 1972–2012 are analyzed. More than 80% of the work has been carried out in the last 15 yr, i.e., from 1997–2012.
Mann, Jakob, Sathe, Ameya
core +3 more sources
Advanced Intelligent Systems, EarlyView.: In this work, Voxel‐SLAM (simultaneous localization and mapping) is introduced: a complete, accurate, and versatile LiDAR (light detection and ranging) ‐inertial SLAM system consisting of five modules: initialization, odometry, local mapping (LM), loop closure (LC), and global mapping (GM), all employing the same map representation, an adaptive voxel
Zheng Liu +9 more
wiley +1 more source
3D ONLINE TERRAIN MAPPING WITH SCANNING RADAR SENSORS [PDF]
ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences, 2020 Environmental perception is one of the core requirements in autonomous vehicle navigation. If exposed to harsh conditions, commonly deployed sensors like cameras or lidars deliver poor sensing performance.
C. Weidinger +4 more
doaj +1 more source