Abstract This paper proposes a vision monitoring system for multipoint deflection of large‐span bridge that can well compensate the camera motion–induced errors. The network (CNS) consists series dual‐camera stations are linked with cooperative markers. infrared illumination supplement device is integrated in station and regular double‐sided prism selected as marker to realize 24‐h continuous monitoring. feasibility efficiency CNS verified by conducting field test inside steel box girders...

Abstract In this work, a non‐overlapping field of view (FOV) multi‐camera system (MCS) has been proposed to realize the motion self‐compensation, which can be flexibly arranged according situation. The challenges ensuring complete fixed measurement platform owing self‐weight, unexpected collisions, and adjacent engineering constructions have addressed in study. MCS on an unstable employ two or more correcting cameras, without overlapping FOV, measure compensate six degrees freedom (6‐DOF)...

Online monitoring of laser welding depth is increasingly important, with the growing demand for precise in field power battery manufacturing new energy vehicles. The indirect methods measurement based on optical radiation, visual image and acoustic signals process zone have low accuracy continuous monitoring. Optical coherence tomography (OCT) provides a direct during shows high achievable Statistical evaluation approach accurately extracts from OCT data but suffers complexity noise removal....

Visual measurement technology has the advantages of high precision, long-distance, multi-point, dynamic, and real-time measurement, is widely used in field displacement monitoring large structures. However, complex environmental conditions construction disturbances can cause vibration platform, resulting significant errors. To address this issue, we propose a method based on generalized dual camera relative motion estimation, linear analytical solution derived. By forming with fixed...

The accurate and efficient segmentation of large-scale urban point clouds is crucial for many higher-level tasks, such as boundary line extraction, cloud registration, deformation measurement. In this paper, we propose a novel supervoxel approach to address the problem under-segmentation in local regions at various resolutions. Our introduces distance constraints from points planes merging stage enhance accuracy between non-coplanar supervoxels. Additionally, supervoxels with roughness above...

Optical cryptosystem based on phase-truncated-Fourier-transforms (PTFT) is one of the most interesting optical cryptographic schemes due to its unique mechanism encryption/decryption. Several cryptanalysis methods using iterative phase/amplitude retrieval algorithm or deep learning (DL) have also been proposed analyze security risks a PTFT-based cryptosystem. In this work, we an innovative way attack with untrained neural network (UNN) model, where parameters are optimized help physical...

Based on thin film optics (TFO) and finite element method (FEM), we have theoretically investigated improving external quantum efficiency (EQE) by anti-reflection (AR) films constructed from subwavelength nano multi-layers (NML) of low high index materials, where the materials are MgF <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> Ta O xmlns:xlink="http://www.w3.org/1999/xlink">5</sub> , respectively. This kind NML dielectric structures...

Optical coherence tomography (OCT) provides a direct welding depth measurement during laser and shows high achievable accuracy in continuous monitoring. Statistical evaluation approach accurately extracts the from OCT-data but suffers complexity noise removal. In this paper, an efficient method coupled DBSCAN (Density-Based Spatial Clustering of Application with noise) percentile filter for determination is proposed. The are viewed as outliers detected by DBSCAN. After eliminating noise,...

Light detection and ranging (LiDAR) systems have made significant contributions in different applications. The laser (LR) system is one of the core components LiDARs. However, existing coaxial LR suffer from low energy efficiency due to obstruction reflection mirror. In this study, we carefully design a transmitter receiver subsystem consequently propose highly energy-efficient for time light-based system, where perforated mirror splicing lens account promotion efficiency. small hole located...

Optical coherence tomography (OCT) allows a direct and precise measurement of laser welding depth by coaxially measuring the keyhole can be used for process monitoring control. When OCT was taken during single-beam welding, instability aluminum resulted in highly scattered data complicated extraction methods. As combination an inner core beam outer ring beam, novel adjustable mode (ARM) producing stable applied to measurement. Different ARM power arrangements were conducted on copper. The...

Energy piles have been popular globally with functions of both pile foundation and ground source heat pumps. Although several researches devoted to the probabilistic design assessment energy piles, corresponding procedures are too complicated for engineers. As a simple variant reliability-based method, load resistance factor (LRFD) approach geotechnical is presented in this study. Firstly, load-transfer model developed investigate effect cyclic thermal loading on settlement. Then, LRFD based...

In this paper, we propose an accurate and simultaneously efficient solution to perspective-n-point-and-line (PnPL) problem by null space analysis. Although many PnPL-like methods have been proposed, it is hard obtain the optimal considering both calculation efficiency accuracy at same time. Based on remarkable EOPnP method, proposed algorithm integrates linear-expressed line constraints with original point constraints, leading a new named EOPnPL. For error measurement, instead of using...

Scanning Kelvin probe microscopy (SKPM), electrostatic force (EFM) are used to study the microscopic processes of photo-induced charge separation at interface Ag and conductive polymers, i.e., poly[2,6-(4,4-bis-(2-ethylhexyl)-4H-cyclopenta[2,1-b;3,4-bʹ]dithiophene)-alt-4,7-(2,1,3-benzothiadiazole)] (PCPDTBT) poly(3-hexylthiophene-2,5-diyl) (P3HT). They also widely in order directly observe distribution dynamic changes interfaces nanostructures, owing their high sensitivity. Using SKPM, it is...

Optical coherence tomography (OCT) provides a direct measurement of welding depth during laser deep-penetration and shows high achievable accuracy in continuous monitoring. Statistical evaluation approach accurately extracts the from raw OCT-data but suffers complexity noise removal. In this work, measuring system based on spectral-domain OCT (SD-OCT) is built simple method coupled DBSCAN percentile filter proposed. The are effectively detected by then applied to cleaned extract depth. By...

The deflection of immersed tunnel element is an important indicator during floating transportation and installation phases. However, there no strictly stable platform to install camera sensors while the in process installation, which poses a challenge application vision-based methods. In this study, novel vision measurement system based on series network (SCN) with displacement-relay characteristics proposed. SCN composed multiple stations measuring points through optical path. Lateral...