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Artículos de revistas sobre el tema "Laser scanning technique"

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Publicado: 10 de marzo de 2023

Última modificación: 19 de julio de 2025

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MacFarlane, D. L., W. Y. Kim, J. S. Nilvi, T. Nuth, and V. Tan. "Novel two-dimensional laser scanning technique." Optics and Lasers in Engineering 17, no. 1 (1992): 1–8. http://dx.doi.org/10.1016/0143-8166(92)90022-y.

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Altyntsev, Maxim A., and Hamid Majid Saber Karkokli. "TECHNIQUE OF AUTOMATIC MOBILE LASER SCANNING DATA FILTERING." Vestnik SSUGT (Siberian State University of Geosystems and Technologies) 26, no. 3 (2021): 5–19. http://dx.doi.org/10.33764/2411-1759-2021-26-3-5-19.

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The result of laser scanning is an array of laser points. The generation of a single point cloud in a given coordinate system is carried out during the registration process at the stage of preliminary field data processing. At this stage it is also often necessary to filter the data. Laser points with an erroneous position are eliminated during the data filleting. The number of erroneous laser points is determined by the of the laser scanner characteristics, surveyed area peculiarities and weather conditions. The devel-opment of methods and algorithms for filtering laser scanning data is carried out based on the analysis of the laser point spatial position and a certain set of additional characteristics, such as intensity value, echo signal, color value. The technique of mobile laser scanning data filtering for the territory of the road passing among the forest and close to individual industrial facilities and building. The main goal of the proposed filtration technique is to obtain data for automatic generation of an accurate digital terrain model. The filtration technique was developed for data acquired under the least favorable con-ditions – in wet weather. Accuracy estimation of generating digital terrain model based on filtered data was carried out.

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Gulino, Michelangelo-Santo, Mara Bruzzi, and Dario Vangi. "Line Scanning with Gas-Coupled Laser Acoustic Detection." Journal of Physics: Conference Series 2293, no. 1 (2022): 012009. http://dx.doi.org/10.1088/1742-6596/2293/1/012009.

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Abstract The Gas-Coupled Laser Acoustic Detection (GCLAD) is an optical technique for ultrasonic detection based on the deviation that a laser beam sustains when travelling in a fluid that features refractive index fluctuations. If the laser beam is perpendicular to the wave propagation direction, the technique enables simultaneous detection of direct waves in mechanical components and eventual echoes from defects to be achieved. The technique is applied to the inspection of elements predominantly extending in one/two dimensions as bars and axisymmetric pieces, exploiting a signal enhancement effect occurring in defects’ proximity. The phenomenon, namely constructive interference between wave crests of a direct Rayleigh ultrasound and those associated with reflections on a defect flank, is first illustrated numerically. The effect of parameters like the angle between wave propagation direction and source-receiver distance on the GCLAD sensitivity is then experimentally highlighted. The technique is finally implemented to B-scan a steel plate with 1 mm wide, 20 mm long, and 3 mm deep surface defects. Since the GCLAD probe laser beam insists on an entire line, defects present on that line can be identified without moving the device along such direction. This reduces the monitoring time compared to techniques leveraging on traditional air-coupled transducers or more sophisticated methods (Scanning Laser Source).

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Piekarczuk, Artur, Aleksandra Mazurek, Jacek Szer, and Iwona Szer. "A Case Study of 3D Scanning Techniques in Civil Engineering Using the Terrestrial Laser Scanning Technique." Buildings 14, no. 12 (2024): 3703. http://dx.doi.org/10.3390/buildings14123703.

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This paper reviews the measurement challenges associated with 3D scanning techniques in civil engineering, exploring the practical aspects of scanning buildings and complex surfaces through various case studies. The paper details the conventional use of Terrestrial Laser Scanning (TLS) for reconstructing the technical documentation of a hall. Then it describes an unconventional application of this technique for measuring an External Thermal Insulation Composite System (ETICS) wall, aimed at detecting microdeformations caused by environmental factors controlled within a climatic chamber. Subsequently, the measurements of the insulated wall were repeated using a metrological grade laser scanner. The numerical data were analysed with inspection engineering methods. The deformation maps and displacements of selected reference points were compared. This approach yielded qualitative and quantitative results. The qualitative results, i.e., the distribution of deformations in the form of a map, turned out to be consistent. However, quantitative results show a significant discrepancy in extreme cases of up to 70%.

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Uotila, Ulrika, Arto Saari, and Juha-Matti Junnonen. "Investigating the barriers to laser scanning implementation in building refurbishment." Journal of Information Technology in Construction 26 (May 27, 2021): 249–62. http://dx.doi.org/10.36680/j.itcon.2021.014.

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The use of the laser scanning technique has increased rapidly in the field of built environment, mainly because it produces highly accurate as-built data. However, the full potential of this technique is utilised only limitedly in building refurbishment projects. This research aims to investigate the barriers to the implementation of laser scanning in building refurbishment projects in Finland. Qualitative interviews were carried out to identify these barriers, and furthermore, to explore the current usage of the technique in building refurbishments. The study shows that many obstacles to implementations are related to challenges in laser scanning procurement, including a low level of competence in acquisition, limitations of the laser scanning technique in building refurbishments, and limitations and challenges in utilising the data in design work. This study is beneficial for building owners and practitioners as it presents the challenges and advantages that laser scanning can provide a refurbishment project. In addition, it offers suggestions to improve the early phase of a refurbishment project in order to achieve greater benefits with laser scanning. Furthermore, the findings may be utilised in the procurement process of laser scanning services in such projects, and the results may potentially solve practical challenges encountered in laser scanning work.

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Weber, Klaus, Alexander Waletzky, Diana Fendl, et al. "New Method for Sperm Evaluation by 3-Dimensional Laser Scanning Microscopy in Different Laboratory Animal Species." International Journal of Toxicology 33, no. 5 (2014): 353–61. http://dx.doi.org/10.1177/1091581814545243.

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Sperm analysis is one of the end points in reproductive toxicology studies. Different methods for quantitative sperm analysis have been described. For qualitative morphological sperm analysis, either such techniques or smears of sperm and histological sperm staging are in use. Any of these methods provides morphological results on a light microscopy level. Laser scanning microscopy is a technique using a focused laser for scanning an object. The Olympus 3D Laser Scanning Microscope LEXT OLS4000 with optional possibilities of differential interference contrast provides a microscopic method for visualizing microasperities, which are far beyond the resolving power of a typical light or laser microscope. This technique was applied to sperm of mice, rats, rabbits, and cynomolgus monkeys at magnifications up to ×17 090. The obtained images are comparable to those of a scanning electron microscope under relatively low-power magnifications. Measurements on sperm parameters were taken by an integrated image analysis software tool. Abnormalities were easily detectable.

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Fuad, N. A., A. R. Yusoff, M. P. M. Zam, et al. "EVALUATING MOBILE LASER SCANNING FOR LANDSLIDE MONITORING." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLII-3/W4 (March 6, 2018): 211–19. http://dx.doi.org/10.5194/isprs-archives-xlii-3-w4-211-2018.

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Abstract. Landslide is one of the natural disasters that give a huge impact to human life and social-economic development. Landslide needs to be monitored periodically in order to avoid loss of human life and damages of properties. Various methods have been used for monitoring landslide. This aim of the research is to evaluate the potential of mobile laser scanning technique for monitoring of landslide area. The objectives of the research are to acquire three-dimensional surface data of landslide area in different epochs and to analyze the movement of the landslide area using three-dimensional surface deviation and ground surveying techniques. The methodology begins with the GPS survey for the establishment of ground control points for the project area. The total station survey was then carried out to measure the three-dimensional coordinates of twenty well distributed targets located at the project area. The data collection phase was then continuing with the mobile laser scanning survey. The processing of the two epochs data acquired from both techniques was then carried out simultaneously and the methodology concluded with the output comparison analysis for the movement detection of the land slip. The finding shows that the mobile laser scanning provides fast and accurate data acquisition technique of the landslide surface. The surface deviation analysis of the two epochs laser scanning data was capable to detect the movement occurred in the project area. The results were successfully evaluated using the changes of the three-dimensional coordinates of the targets from the two epoch’s ground surveying data.

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Song, Jung Han, Y. Zhang, J. Lee, et al. "A Numerical Approach to Shape Correction of Stamped Products Using Laser Forming Techniques." Key Engineering Materials 535-536 (January 2013): 239–42. http://dx.doi.org/10.4028/www.scientific.net/kem.535-536.239.

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Laser forming is an advanced process in sheet metal forming in which a laser heat source is used to shape the metal sheet. In this paper, shape correction of stamped product using the laser forming technique is numerically invesitgaed. As a fundamental study, laser irradiated bending process has been analyzed through the thermo-mechanical FE analysis. Laser scanning experiments has been also conducted for varificaiton of numerical simulations. Finally, the laser forming technique is applied to the u-shaped channel member for springback compensation. It is observed that laser irradiation gives the desired bending angle to compensate the springback by controlling the process parameters such as the laser power, scanning speeds and the number of laser scanning.

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Altyntsev, Maxim A., and Karkokli Hamid Majid Saber. "TECHNIQUE OF AUTOMATIC MOBILE LASER SCANNING DATA ADJUSTMENT." Vestnik SSUGT (Siberian State University of Geosystems and Technologies) 26, no. 4 (2021): 5–23. http://dx.doi.org/10.33764/2411-1759-2021-26-4-5-23.

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Adjustment is a main step in the preliminary processing of mobile laser scanning (MLS) data. As a result of this step, a point cloud is generated in a certain coordinate system. The modern software, provided with the corresponding surveying system, is capable of performing in automatic mode most stages of MLS data adjustment obtained for territories with different quantity of buildings. With a suf-ficient number of vertically arranged planar objects, such as building walls, the algorithms embedded in the software provide a high accuracy of relative adjustment, which consists in calculating and ap-plying corrections for trajectories obtained with re-scanning the same area. Absolute adjustment can also be carried out automatically, subject to the rules for placing control points in order to automatically detect them. This kind of adjustment involves transforming a point cloud with using control point coordinates measured with more accurate surveying methods. The accuracy of automatic relative adjustment can be significantly reduced with the almost complete absence of vertical flat objects. In this case, it is necessary to develop additional adjustment techniques capable of using not only flat objects of a large area, but also vertical objects, such as road signs and poles. Comprehensive technique of MLS data adjustment, which can use information on the position of road signs and poles for territories with an insufficient number of vertical flat objects is proposed. The accuracy estimation of both the relative and absolute MLS data adjustment according to the proposed technique was carried out. The choice of the required control point density for territories with different quantity of buildings is explained.

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Nguyen Tien Thanh, Nguyen Tien Thanh, 刘修国 Liu Xiuguo, 王红平 Wang Hongping, 于明旭 Yu Mingxu, and 周文浩 Zhou Wenhao. "3D Model Reconstruction Based on Laser Scanning Technique." Laser & Optoelectronics Progress 48, no. 8 (2011): 081201. http://dx.doi.org/10.3788/lop48.081201.

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Samiei, Mohammad, Seyyed Mahdi Vahid Pakdel, Sahand Rikhtegaran, Sahar Shakoei, Delaram Ebrahimpour, and Pedram Taghavi. "Scanning Electron Microscopy Comparison of the Cleaning Efficacy of a Root Canal System by Nd:YAG Laser and Rotary Instruments." Microscopy and Microanalysis 20, no. 4 (2014): 1240–45. http://dx.doi.org/10.1017/s1431927614000981.

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AbstractThis study evaluated the cleaning efficacy of a root canal system by Nd:YAG laser and rotary instruments. Sixty single-rooted human teeth were divided into four experimental groups (n=15). In the first group the teeth were prepared with a step-back technique using conventional K-files. In the second and third groups, tooth preparation was carried out using Nd:YAG laser and rotary NiTi instruments, respectively. Teeth in the fourth group were prepared by combined laser and rotary methods. The smear layer remaining on canal walls was then assessed by scanning electron microscopy in the coronal, middle, and apical portions. The comparison of smear layer removal efficacy between groups was carried out by Kruskal–Wallis and Mann–Whitney U tests. The mean grades of smear layer removal in rotary-laser, rotary, laser and step-back techniques were 1.34±0.18, 2.2±0.28, 1.91±0.25, and 2.42 ±0.19, respectively. On the whole, differences between rotary-laser and rotary groups, step-back, and the three other techniques (rotary, laser, and rotary-laser) were significant at p=0.034. Based on the findings of this study, the cleaning efficacy of rotary, laser, and rotary-laser techniques were better than the step-back technique and the combined laser and rotary technique was the most efficient method.

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Sobura, Szymon, Kamil Bacharz, and Grzegorz Granek. "ANALYSIS OF TWO-OPTION INTEGRATION OF UNMANNED AERIAL VEHICLE AND TERRESTRIAL LASER SCANNING DATA FOR HISTORICAL ARCHITECTURE INVENTORY." Geodesy and cartography 49, no. 2 (2023): 76–87. http://dx.doi.org/10.3846/gac.2023.16990.

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The 3D reconstruction of historical and cultural heritage monuments is a procedure recommended by the UNESCO World Heritage Institution since 1985. It is crucial when conserving monuments and creating digital twins. Current 3D reconstruction techniques using digital images and terrestrial laser scanning (TLS) data are considered as cost-effective and efficient methods for the production of high-quality digital 3D models. In the presented study, laser scanning and close-range photogrammetry techniques and images taken by a low-cost unmanned aerial vehicle (UAV) were applied to quickly and completely acquire the point cloud and texture of a historic church in Poland. The aim of this study was to evaluate two options for integrating TLS and UAV data, using ground control points (GCP) measured by two independent techniques: tachymetry and laser scanning. The study shows that the 3D model created based on ground control points acquired by the laser scanning technique has a mean square error RMSEXYZ = 2.5 cm on the check points. The result obtained is not much larger than the second variant of data integration, for which RMSEXYZ = 1.7 cm. Thus, the TLS method was positively evaluated as a GCP measurement technique for the integration of UAV and TLS data and the creation of cartometric 3D models of religious buildings.

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McDevitt, T. E., G. H. Koopmann, and C. B. Burroughs. "Two-Channel Laser Vibrometer Techniques for Vibrational Intensity Measurements: Part 1—Flexural Intensity." Journal of Vibration and Acoustics 115, no. 4 (1993): 436–40. http://dx.doi.org/10.1115/1.2930369.

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A laser technique which measures vibrational energy flow (intensity) via propagating bending waves is described. A pair of scanning laser beams from a two-channel laser vibrometer is used to provide a nonintrusive measurement of the intensity at various points on a vibrating beam. Results are shown to compare well with those of two additional techniques. These techniques, used for validation, employ a single laser beam and can only be used at resonance frequencies in beams or rods. The two-channel laser technique described can be applied to two-dimensional intensity measurements, is not limited to single frequency excitation, and has an inherent capability to facilitate phase error elimination via a photodetector switching technique which is also described.

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Sharafutdinova, Anzhelika A., and Michael Ja Bryn. "TECHNIQUE FOR DESIGNING AND CONSTRUCTING A GEODETIC NETWORK WHEN PERFORMING TERRESTRIAL LASER SCANNING AT INDUSTRIAL OBJECT." Vestnik SSUGT (Siberian State University of Geosystems and Technologies) 27, no. 2 (2022): 72–85. http://dx.doi.org/10.33764/2411-1759-2022-27-2-72-85.

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When performing terrestrial laser scanning of large industrial facilities, it must give special atten-tion to designing and establishing a geodetic network to datum transformation measurements into a coordinate system. However, the design of geodetic networks by traditional geodesy methods does not consider all the features of the technique of terrestrial laser scanning. Also worth taking into account is the specifics of laser scanning data processing. Therefore, it is necessary to develop a methodology for designing and establishing a geodetic network in the context of terrestrial laser scanning. For this, the article analyzes the features of terrestrial laser scanning of large industrial facilities and methods for measurement results processing. Based on the analysis and practical experience, developing a flow chart for establishing a geodetic network was on the condition that registration of point cloud perform-ing used iterative closest points algorithm and datum transformation coordinate system performing us-ing HDS targets. Also, based on practical experience, the dependence of the values of the root-mean-square error of registration point cloud and the root-mean-square error of laser scanning station posi-tioning on the distance between the stations. As a result, a methodology for designing and establishing the geodetic network has been substantiated, including two stages. The first stage is the design and ac-curacy assessment of the geodetic control network, the coordinates of which are determined from the datum points by traditional geodesy methods. The second stage is the design and accuracy assessment of the laser scanning station positioning, the coordinates of which are determined from the geodetic control network.

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Kossakovski, Dmitri A., John D. Baldeschwieler, and J. L. Beauchamp. "Chemical Imaging With a Scanning Probe Microscope." Microscopy and Microanalysis 5, S2 (1999): 970–71. http://dx.doi.org/10.1017/s1431927600018171.

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Scanning Probe Microscopy (SPM) is a superb tool for topographical analysis of samples. However, traditional varieties of SPM such as Atomic Force, Scanning Tunneling and Near-field Scanning Optical Microscopy have limited chemical contrast capability. Recently, several advanced techniques have been reported which provide chemical information in addition to topographical data. All these methods derive advantage from combinations of scanning probe methodologies and some other, chemically sensitive technique. Examples of such approaches are: Near-field Scanning Raman Imaging, Near-field Scanning Infrared Microscopy and mass spectrometric analysis with laser ablation through fiber probes.In this contribution we report the development of a new method in this family of chemically sensitive scanning probe techniques: Laser Induced Breakdown Spectroscopy with Shear Force Microscopy, LIBS-SFM. Traditional LIBS experiments involve focusing a pulsed laser beam onto the sample and observing optical emission from the plasma formed in the ablation area. The emissions are mostly in the UV/visible range, and the signal is due to electronic transitions in excited atoms and ions in the plasma plume. The spectra are analyzed to identify chemical elements. The spatial resolution of LIBS is limited by the wavelength and beam quality of the laser used for ablation. The experiments may be conducted in vacuum, controlled atmosphere, or ambient air.

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Cheng, P. C., S. J. Pan, A. Shih, et al. "Two-Photon Laser Scanning Confocal Microscopy." Microscopy and Microanalysis 3, S2 (1997): 847–48. http://dx.doi.org/10.1017/s1431927600011120.

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Two-photon fluorescence microscopy has become an important research tool in both biological and material sciences. The technique uses long wavelength, typically in the near IR, as the excitation light to obtain shorter wavelength fluorescence (e.g. visible light). Because of the low linear absorption coefficient of most biological and polymeric specimens, this technique allows deeper penetration of the excitation beam, achieving optical sectioning to a depth of 250μm or more into the specimen. As a result of the quadratic dependency of the two-photon induced fluorescence to the excitation intensity, the fluorescent emission and photobleaching are limited to the vicinity of focal spot. This capability of addressing a specimen’s 3D space allows exciting possibilities in biological researches, such as 3D photobleaching recovery experiment.Two-photon confocal fluorescence microscopy is ideal for the study of thick biological and material specimen in 3D. For example, Figure 1 shows a three-dimensional isosurface rendered image of a vascular bundle from a maize stem.

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Bojić, Mirnes, and Dušan Kogoj. "Calibration of Terrestrial Laser Scanner." Geodetski glasnik, no. 48 (December 31, 2017): 50–73. http://dx.doi.org/10.58817/2233-1786.2017.51.48.50.

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Terrestrial laser scanning is very powerful and advanced geodetic surveying technique, which has lately made significant progress in its development and improvement. For results of laser scanning to be accurate and reliable, beside the list of other conditions, it is necessary to have calibrated laser scanner. Calibration of laser scanner is very important element of the whole laser scanning process and it is necessary to give this element special attention. In this paper authors try to describe different procedures of calibration of terrestrial laser scanners.

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Teng, Xu, Feng Li, and Chao Lu. "Visualization of materials using the confocal laser scanning microscopy technique." Chemical Society Reviews 49, no. 8 (2020): 2408–25. http://dx.doi.org/10.1039/c8cs00061a.

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Zaczek-Peplinska, Janina, Paweł Popielski, Adam Kasprzak, and Paweł Wójcik. "Development of Large Concrete Object Geometrical Model Based on Terrestrial Laser Scanning." Reports on Geodesy and Geoinformatics 97, no. 1 (2015): 91–102. http://dx.doi.org/10.2478/rgg-2014-0014.

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AbstractThe paper presents control periodic measurements of movements and survey of concrete dam on Dunajec River in Rożnów, Poland. Topographical survey was conducted using laser scanning technique. The goal of survey was data collection and creation of a geometrical model. Acquired cross- and horizontal sections were utilised to create a numerical model of object behaviour at various load depending of changing level of water in reservoir. Modelling was accomplished using finite elements technique. During the project an assessment was conducted to terrestrial laser scanning techniques for such type of research of large hydrotechnical objects such as gravitational water dams. Developed model can be used to define deformations and displacement prognosis.

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Li Xiaoying, 李晓莹, 梁晓伟 Liang Xiaowei, 乔大勇 Qiao Dayong, 刘耀波 Liu Yaobo, 潘春辉 Pan Chunhui, and 练彬 Lian Bin. "Miniature Laser Projection Display Technique Based on Lissajous Scanning." Acta Optica Sinica 34, no. 6 (2014): 0612005. http://dx.doi.org/10.3788/aos201434.0612005.

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杨, 敏. "Application of 3D Laser Scanning Technique in Complex Surface." Geomatics Science and Technology 09, no. 03 (2021): 82–89. http://dx.doi.org/10.12677/gst.2021.93010.

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Oseni, A. E., O. K. Ajani, A. J. Adewale, O. O. Ayodeji, and T. O. Desalu. "3d Modelling of Structures using terrestrial laser scanning technique." International Journal of Advanced Engineering, Management and Science 6, no. 7 (2020): 316–31. http://dx.doi.org/10.22161/ijaems.67.4.

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Xue, Bin, Xiaoxia Yang, and Jigui Zhu. "Architectural stability analysis of the rotary-laser scanning technique." Optics and Lasers in Engineering 78 (March 2016): 26–34. http://dx.doi.org/10.1016/j.optlaseng.2015.09.005.

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Fojcik, Zenon, Marcin Hojka, Sylwester Kaczmarzewski, and Gabriela Woźniak. "Examples of laser scanning application in JSW SA mines." E3S Web of Conferences 567 (2024): 01007. http://dx.doi.org/10.1051/e3sconf/202456701007.

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Laser scanning offers timely assessments of mine sites despite challenges posed by operational environments. This article explores advancements in 3D scanning systems, data capture and processing techniques, and their primary applications in underground mining, using JSW SA mines as an example. While laser scanning has matured for tasks such as change detection, clearance measurements, and structure mapping, opportunities for enhancement exist in areas such as lithology identification, surface parameter measurements, and autonomous navigation. Limited infrastructure for data transfer and processing remains a constraint; however, laser scanners are increasingly pivotal in mine automation due to their affordability, accuracy, and mobility. Until recently, laser scanning was considered more of a curiosity than a mainstream measuring method. In Poland, creating maps for land surveying based on point clouds generated by laser scanners remains uncommon. Nevertheless, technological advances over the past decade have made surveyors, designers, architects, and conservators of historical monuments increasingly inclined and capable of utilizing point clouds generated by stationary scanners, which offer evergreater measurement accuracy. This article outlines how laser scanning, as an innovative measurement technique, has been integrated into the mining industry, particularly for shaft monitoring purposes.

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Hollaus, M., W. Wagner, and K. Kraus. "Airborne laser scanning and usefulness for hydrological models." Advances in Geosciences 5 (December 16, 2005): 57–63. http://dx.doi.org/10.5194/adgeo-5-57-2005.

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Abstract. Digital terrain models form the basis for distributed hydrologic models as well as for two-dimensional hydraulic river flood models. The technique used for generating high accuracy digital terrain models has shifted from stereoscopic aerial-photography to airborne laser scanning during the last years. Since the disastrous floods 2002 in Austria, large airborne laser-scanning flight campaigns have been carried out for several river basins. Additionally to the topographic information, laser scanner data offer also the possibility to estimate object heights (vegetation, buildings). Detailed land cover maps can be derived in conjunction with the complementary information provided by high-resolution colour-infrared orthophotos. As already shown in several studies, the potential of airborne laser scanning to provide data for hydrologic/hydraulic applications is high. These studies were mostly constraint to small test sites. To overcome this spatial limitation, the current paper summarises the experiences to process airborne laser scanner data for large mountainous regions, thereby demonstrating the applicability of this technique in real-world hydrological applications.

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Lee, H. M., Y. H. Kwon, Hyo Seon Park, and I. Lee. "Displacement Measurement of an Existing Long Span Steel Box-Girder Using Terrestrial Laser Scanning." Key Engineering Materials 347 (September 2007): 511–16. http://dx.doi.org/10.4028/www.scientific.net/kem.347.511.

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To make use of a new technology in the field of structural health monitoring, various displacement measuring techniques such as a global positioning system (GPS) and vision-based techniques have been studied and proposed. It was previously introduced a new displacement measuring technique using terrestrial laser scanning (TLS) that remotely samples the surface of an object using laser pulses and generates the three-dimensional (3D) coordinates of numerous points on the surface. In this paper, for an assessment of the capabilities of the measuring technique about existing structures, the field tests for vertical displacement measurement of an existing long span steel box-girder are experimentally carried out. The performance of the technique is evaluated by comparing the displacements obtained from TLS system and displacements directly measured from linear variable displacement transducer (LVDT).

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Kardoš, Miroslav, Ivan Sačkov, Julián Tomaštík, Izabela Basista, Łukasz Borowski, and Michal Ferenčík. "Elevation Accuracy of Forest Road Maps Derived from Aerial Imaging, Airborne Laser Scanning and Mobile Laser Scanning Data." Forests 15, no. 5 (2024): 840. http://dx.doi.org/10.3390/f15050840.

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Forest road maps are a fundamental source of information for the sustainable management, protection, and public utilization of forests. However, the precision of these maps is crucial to their use. In this context, we assessed and compared the elevation accuracy of terrain on three forest road surfaces (i.e., asphalt, concrete, and stone), which were derived based on data from three remote sensing technologies (i.e., aerial imaging, airborne laser scanning, and mobile laser scanning) using five geospatial techniques (i.e., inverse distance; natural neighbor; and conversion by average, maximal, and minimal elevation value). Specifically, the elevation accuracy was assessed based on 700 points at which elevation was measured in the field, and these elevations were extracted from fifteen derived forest road maps with a resolution of 0.5 m. The highest precision was found on asphalt roads derived from mobile laser scanning data (RMSE from ±0.01 m to ±0.04 m) and airborne laser scanning data (RMSE from ±0.03 m to ±0.04 m). On the other hand, the lowest precision was found on all roads derived from aerial imaging data (RMSE from ±0.11 m to ±0.23 m). Furthermore, we found significant differences in elevation between the measured and derived terrains. However, the differences in elevation between specific techniques, such as inverse distance, natural neighbor, and conversion by average, were mostly random. Moreover, we found that airborne and mobile laser scanning technologies provided terrain on concrete and stone roads with random elevation differences. In these cases, it is possible to replace a specific technique or technology with one that is similar without significantly decreasing the elevation accuracy (α = 0.05).

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Zhong, Mian, Shichen Li, Yao Zou, et al. "Hydrophobic Surface Array Structure Based on Laser-Induced Graphene for Deicing and Anti-Icing Applications." Micromachines 15, no. 2 (2024): 285. http://dx.doi.org/10.3390/mi15020285.

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The exceptional performance of graphene has driven the advancement of its preparation techniques and applications. Laser-induced graphene (LIG), as a novel graphene preparation technique, has been applied in various fields. Graphene periodic structures created by the LIG technique exhibit superhydrophobic characteristics and can be used for deicing and anti-icing applications, which are significantly influenced by the laser parameters. The laser surface treatment process was simulated by a finite element software analysis (COMSOL Multiphysics) to optimize the scanning parameter range, and the linear array surface structure was subsequently fabricated by the LIG technique. The generation of graphene was confirmed by Raman spectroscopy and energy-dispersive X-ray spectroscopy. The periodic linear array structure was observed by scanning electron microscopy (SEM) and confocal laser imaging (CLSM). In addition, CLSM testings, contact angle measurements, and delayed icing experiments were systematically performed to investigate the effect of scanning speed on surface hydrophobicity. The results show that high-quality and uniform graphene can be achieved using the laser scanning speed of 125 mm/s. The periodic linear array structures can obviously increase the contact angle and suppress delayed icing. Furthermore, these structures have the enhanced ability of the electric heating deicing, which can reach 100 °C and 240 °C within 15 s and within 60 s under the DC voltage power supply ranging from 3 to 7 V, respectively. These results indicate that the LIG technique can be developed to provide an efficient, economical, and convenient approach for preparing graphene and that the hydrophobic surface array structure based on LIG has considerable potential for deicing and anti-icing applications.

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Cardenal Escarcena, Javier, Emilio Mata de Castro, José Luis Pérez García, et al. "Integration of photogrammetric and terrestrial laser scanning techniques for heritage documentation." Virtual Archaeology Review 2, no. 3 (2011): 53. http://dx.doi.org/10.4995/var.2011.4605.

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This paper presents the preliminary works of the Integration of Photogrammetric and Terrestrial Laser Scanner Techniques for Heritage Documentation Research Project (IFOTEL TIN2009-09939; Ministry of Science and Innovation, National Programme R+D+I, 2008-2011). The IFOTEL project aims with the improvement and optimization of heritage documentation by means of combination and integration of different methods and techniques, mainly close range photogrammetry (both terrestrial and aerial with light platforms), terrestrial laser scanner and surveying, joining the advantages of the different methods but also minimizing the disadvantages of each single technique.

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Jo, Y. H., and J. Y. Kim. "THREE-DIMENSIONAL DIGITAL DOCUMENTATION OF HERITAGE SITES USING TERRESTRIAL LASER SCANNING AND UNMANNED AERIAL VEHICLE PHOTOGRAMMETRY." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLII-2/W5 (August 18, 2017): 395–98. http://dx.doi.org/10.5194/isprs-archives-xlii-2-w5-395-2017.

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Three-dimensional digital documentation is an important technique for the maintenance and monitoring of cultural heritage sites. This study focuses on the three-dimensional digital documentation of the Magoksa Temple, Republic of Korea, using a combination of terrestrial laser scanning and unmanned aerial vehicle (UAV) photogrammetry. Terrestrial laser scanning mostly acquired the vertical geometry of the buildings. In addition, the digital orthoimage produced by UAV photogrammetry had higher horizontal data acquisition rate than that produced by terrestrial laser scanning. Thus, the scanning and UAV photogrammetry were merged by matching 20 corresponding points and an absolute coordinate system was established using seven ground control points. The final, complete threedimensional shape had perfect horizontal and vertical geometries. This study demonstrates the potential of integrating terrestrial laser scanning and UAV photogrammetry for three-dimensional digital documentation. This new technique is expected to contribute to the three-dimensional digital documentation and spatial analysis of cultural heritage sites.

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Liu, Qiang, Fuqiang Shi, Xuguang Wang, and Mingsheng Zhao. "Statistical Estimation of Blast Fragmentation by Applying 3D Laser Scanning to Muck Pile." Shock and Vibration 2022 (September 26, 2022): 1–15. http://dx.doi.org/10.1155/2022/3757561.

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Run-of-mine fragmentation is an important aspect of mine productivity optimization, as it affects all mine-to-mill processes. The current blasting fragmentation calculation methods do not consider the 3D geometric information. Therefore, their calculation results are imprecise. 3D laser scanning is a technique for extracting the 3D geometric information of an object by constructing a 3D point cloud model, with which extra information on the geometrical characteristics of an object could be captured than with the technique of 2D image processing. In this paper, 3D laser scanning technology was utilized for the calculation of the rock blocks on the surface of a muck pile, and the information about the surface blocks was utilized as the samples for the statistical estimation of blasting fragmentation of muck pile (BFMP). Monte Carlo simulation was utilized as the statistical estimation method for the BFMP. In the lab experiment, results from 2D image processing technique and from 3D laser scanning technique combined with statistical estimate were compared with the physical measurements utilizing a water tank, which show that results with 3D laser scanning are more similar to the physical measurement. Finally, the applicability of 3D laser scanning technology combined with statistical methods to the calculation of blast fragmentation was estimated through field tests in Biesikuduke and Santanghu mine, two open-pit coal mines in Xinjiang Province of western China. Results show that the accuracy of the statistical estimation results of BFMP has a particle size deviation of 1–3 cm.

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Nykyruy, Yulia, and Nazar Sembratovych. "Structure transformation in amorphous Fe-B ribbon under laser scanning." Physics and Chemistry of Solid State 25, no. 4 (2024): 718–22. http://dx.doi.org/10.15330/pcss.25.4.718-722.

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Amorphous Fe86B14 alloy produced by the melt quenching technique was processed by pulsed fibber laser in scanning mode with various scanning speed and laser power. X-ray diffraction method was used to study the laser-induced structure evolution in the amorphous ribbon. Nanosized grains of α-Fe phase were observed as a result of partial crystallization.

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Kubanova, A. A., A. A. Kubanov, V. A. Smolyannikova, N. V. Gribanov, and YU B. Makhakova. "Diagnostic value of the confocal laser scanning microscopy in vivo." Vestnik dermatologii i venerologii 91, no. 3 (2015): 67–74. http://dx.doi.org/10.25208/0042-4609-2015-91-3-67-74.

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The confocal laser scanning microscopy in vivo is a promising study method to visualize cell structures of epidermis and papillary dermis without affecting the skin integrity, which provides for a resolution and contrast similar to those characteristic of the classical histology examination. Goal. To assess the confocal laser scanning microscopy in vivo (CLSM) technique for diagnosing actinic keratosis, psoriasis vulgaris and rosacea vs. the classical histology examination. Study materials. The article describes the results obtained by using the confocal laser scanning microscopy in vivo technique vs. the histology examination in 10 patients with erythematous actinic keratosis, 10 patients with extensive psoriasis and 10 patients with erythematous and papulous rosacea. Results. The article describes diagnostically significant signs of the diseases detected by using the confocal laser scanning microscopy in vivo as well as the potential of this method in terms of diagnosing inflammatory skin diseases.

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Fischer, D., G. F. de la Fuente, and M. Jansen. "A new pulsed laser deposition technique: Scanning multi-component pulsed laser deposition method." Review of Scientific Instruments 83, no. 4 (2012): 043901. http://dx.doi.org/10.1063/1.3697861.

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Suarez, Ismael F., Felix S. Tembleque, Jose M. R. Sar, Ricardo J. Rivera, and Jordi D. Martin. "Feasibility of Laser Scanning to Determine Volumetric Properties of Fine Grained Soils." Soils and Rocks 38, no. 1 (2015): 59–66. http://dx.doi.org/10.28927/sr.381059.

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This study analyses the real applicability of laser scanning techniques to determine bulk densities of fine grained soils. The method, fast and accurate, can be employed both in the field and laboratory. The technique was calibrated with benchmarks and then applied to measure volumes of small samples of a specific silty soil of well-known properties (granite sawdust); next transformed into bulk densities from the sample-weights. The results are compared against those obtained from their precursor specimens, made using the Standard Proctor test. Before calculating soil sample volumes, optimum conditions for data acquisition, exportation and post-processing were assessed. The laser scanning provides highly consistent results when compared with those obtained from Standard Proctor compaction tests. However, the study shows a limiting value of moisture content below which the laser scan provides inaccurate results. Likely, this limit varies from soil to soil and therefore the technique must be calibrated before being used to determine bulk densities and derived volumetric properties (i.e., porosity or void ratio). Accordingly, this work presents a helpful procedure to evaluate the applicability of the laser scanning based on the detection of the limiting water content, which considers as well anomalies derived from compositional heterogeneities or external electromagnetic interferences.

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Chen, Chin Sheng, Wei Ke Wang, Chien Liang Huang, and Chun Wei Yeh. "Field Distortion Compensation for Galvanometric Scanning Machines." Applied Mechanics and Materials 284-287 (January 2013): 2746–50. http://dx.doi.org/10.4028/www.scientific.net/amm.284-287.2746.

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The laser manufacture has been widely used in micro-machining as a burgeoning technology. Galvanometric scanning systems is an important component in laser machines, but the galvanometric scanning system is usually combines the image field distortion that is from the mechanism and optical devices. The paper has presented a novel correction algorithm based on ride regression method for compensates the image field distortion. And the Euclidean distance error and the maximum error are 0.0422 and 0.09, respectively. This novel correction technique can effectively increase the accuracy of laser spot position and can further improve the performance of the galvanometric scanning system.

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Skoog, B., P. Helmholz, and D. Belton. "MULTISPECTRAL ANALYSIS OF INDIGENOUS ROCK ART USING TERRESTRIAL LASER SCANNING." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLI-B5 (June 15, 2016): 405–12. http://dx.doi.org/10.5194/isprs-archives-xli-b5-405-2016.

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Multispectral analysis is a widely used technique in the photogrammetric and remote sensing industry. The use of Terrestrial Laser Scanning (TLS) in combination with imagery is becoming increasingly common, with its applications spreading to a wider range of fields. Both systems benefit from being a non-contact technique that can be used to accurately capture data regarding the target surface. Although multispectral analysis is actively performed within the spatial sciences field, its extent of application within an archaeological context has been limited. This study effectively aims to apply the multispectral techniques commonly used, to a remote Indigenous site that contains an extensive gallery of aging rock art. The ultimate goal for this research is the development of a systematic procedure that could be applied to numerous similar sites for the purpose of heritage preservation and research. The study consisted of extensive data capture of the rock art gallery using two different TLS systems and a digital SLR camera. The data was combined into a common 2D reference frame that allowed for standard image processing to be applied. An unsupervised k-means classifier was applied to the multiband images to detect the different types of rock art present. The result was unsatisfactory as the subsequent classification accuracy was relatively low. The procedure and technique does however show potential and further testing with different classification algorithms could possibly improve the result significantly.

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Ratautas, Karolis, Vytautas Vosylius, Aldona Jagminienė, Ina Stankevičienė, Eugenijus Norkus, and Gediminas Račiukaitis. "Laser-Induced Selective Electroless Plating on PC/ABS Polymer: Minimisation of Thermal Effects for Supreme Processing Speed." Polymers 12, no. 10 (2020): 2427. http://dx.doi.org/10.3390/polym12102427.

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The selective surface activation induced by laser (SSAIL) for electroless copper deposition on Polycarbonate/Acrylonitrile Butadiene Styrene (PC/ABS) blend is one of the promising techniques of electric circuit formation on free-shape dielectric surfaces, which broadens capabilities of 3D microscopic integrated devices (3D-MIDs). The process consists of laser excitation, chemical activation of laser-excited areas by dipping in a liquid and electroless copper deposition of the laser-treated areas. The limiting factor in increasing throughput of the technology is a laser activation step. Laser writing is performed by modern galvanometric scanners which reach the scanning speed of several meters per second. However, adverse thermal effects on PC/ABS polymer surface abridge the high-speed laser writing. In this work, an investigation was conducted on how these thermal effects limit surface activation for selective metal deposition from the view of physics and chemistry. An advanced laser beam scanning technique of interlacing with precise accuracy and the pulse-on-demand technique was applied to overcome mentioned problems for fast laser writing. Initially, the modelling of transient heat conduction was performed. The results revealed a significant reduction in heat accumulation. Applied methods of laser writing allowed the overall processing rate to increase by up to 2.4 times. Surface morphology was investigated by a scanning electron microscope. Energy-dispersive X-ray spectroscopy was used to investigate the modification of atomic concentration on the surface after laser treatment. Experiments did not show a correlation between surface morphology and electroless plating on laser-treated areas. However, significant variation in the composition of the material was revealed depending on the surface activity for electroless plating.

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Salim, Muhammad Nor, Takahiro Hayashi, Morimasa Murase, Toshihiro Ito, and Shoji Kamiya. "Fast Remaining Thickness Measurement Using a Laser Source Scanning Technique." MATERIALS TRANSACTIONS 53, no. 4 (2012): 610–16. http://dx.doi.org/10.2320/matertrans.i-m2012801.

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Choi, Sang Woo, Joon Hyun Lee, An Jin Nam, and Sridhar Krishnaswamy. "Application of Scanning Laser Source Technique for Nondestructive Flaw Detection." Key Engineering Materials 270-273 (August 2004): 787–92. http://dx.doi.org/10.4028/www.scientific.net/kem.270-273.787.

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Goel, Salil, and Bharat Lohani. "A Motion Correction Technique for Laser Scanning of Moving Objects." IEEE Geoscience and Remote Sensing Letters 11, no. 1 (2014): 225–28. http://dx.doi.org/10.1109/lgrs.2013.2253444.

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Guan, Jianfei, Zhonghua Shen, Jian Lu, Xiaowu Ni, Jijun Wang, and Baiqiang Xu. "Finite Element Analysis of the Scanning Laser Line Source Technique." Japanese Journal of Applied Physics 45, no. 6A (2006): 5046–50. http://dx.doi.org/10.1143/jjap.45.5046.

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Sohn, Younghoon, and Sridhar Krishnaswamy. "Mass spring lattice modeling of the scanning laser source technique." Ultrasonics 39, no. 8 (2002): 543–51. http://dx.doi.org/10.1016/s0041-624x(02)00250-0.

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Merson, E., V. Danilov, D. Merson, and A. Vinogradov. "Confocal laser scanning microscopy: The technique for quantitative fractographic analysis." Engineering Fracture Mechanics 183 (October 2017): 147–58. http://dx.doi.org/10.1016/j.engfracmech.2017.04.026.

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Feng, Tian-jin, Xin Li, Guang-rong Ji, et al. "A new laser-scanning sensing technique for underwater engineering inspection." Artificial Intelligence in Engineering 10, no. 4 (1996): 363–68. http://dx.doi.org/10.1016/0954-1810(96)00008-8.

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Lehtomäki, Matti, Antero Kukko, Leena Matikainen, Juha Hyyppä, Harri Kaartinen, and Anttoni Jaakkola. "Power line mapping technique using all-terrain mobile laser scanning." Automation in Construction 105 (September 2019): 102802. http://dx.doi.org/10.1016/j.autcon.2019.03.023.

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Hong, Seung Chan, Jung Ryul Lee, See Yenn Chong, and Chan Yik Park. "Effect of Laser Pulse Fatigue on the Mechanical Characteristics of a CFRP Plate." Applied Mechanics and Materials 225 (November 2012): 121–26. http://dx.doi.org/10.4028/www.scientific.net/amm.225.121.

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A laser ultrasonic based nondestructive evaluation (NDE) technique has been widely used in aerospace industries for inspecting parts and structures made of composite materials. The thermoelastic regime is used for the ultrasonic generation, so no plasma is formed on the surface of composite structure. Generally, the service lifetime for an aircraft could be more than 25 years. Thus, the composite structures of the aircraft could be susceptible to laser pulse fatigue damage caused by the laser pulse energy of a laser ultrasonic generator in the long-term periodic maintenance inspection. In this paper, the effect of laser pulse fatigue on the mechanical characteristics of a carbon-fiber-reinforced polymer (CFRP) plate (USN175BX Carbon UD preprag) with the stacking sequence of [0/45/-45/90]s is investigated to verify the reliability of the use of a laser ultrasonic based NDE technique on the CFRP plate specimen inspection. A high-speed laser ultrasonic scanning system (400mm/s at the intervals of 0.4 mm) was setup to perform repeat scanning of 1300 times on a CFRP plate specimen with the scanning area of 70 mm x 60 mm. These repeat scanning times were set in consideration of the periodic maintenance inspection scheduled to be 1 time/week x 52 weeks/year x 25 years. A 532nm Q-switched continuous wave laser (QL) was used and set at the laser pulse energy levels of 0.6 mJ and 1.2 mJ. Lamb wave assessment based on pitch-catch method was proposed in this paper to monitor the mechanical characteristics of a composite specimen. In each completion of 100 times repeat scanning, the Young’s modulus of the scanning area was evaluated based on the group velocity of S0 Lamb wave mode. In addition, the surface condition of the scanning area was investigated by using a microscope.

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Altyntsev, M. A. "The technique of UAV-based airborne laser scanning data preliminary processing." Geodesy and Cartography 996, no. 6 (2023): 30–41. http://dx.doi.org/10.22389/0016-7126-2023-996-6-30-41.

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The technique of UAV-based airborne laser scanning data preliminary processing is proposed. Its main steps, such as filtering the data, determining the calibration parameters of the survey system, strip adjustment of trajectories and point clouds are described and analyzed. The high density of a point cloud, which is the basic feature of the measurements made at low altitude, is taken into account. The study of the technique was carried out on the example of urban area data obtained with the laser scanner AGM-MS3. This information served to develop filtering and relative orientation algorithms. The initial data AGM-MS3 were also analyzed for the need to adjust them when the distance between adjacent strips is short. It is concluded that the technique can be used to process data on any territory.

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Wang, Xi Yuan, Yong Guang Huang, De Wei Liu, Bao Jun Wang, Xiao Ning Zhu, and Hong Liang Zhu. "Large Area Uniform Microstructures on Silicon Surface Created with a Picosecond Laser Beam Scanning." Advanced Materials Research 651 (January 2013): 327–32. http://dx.doi.org/10.4028/www.scientific.net/amr.651.327.

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We present the experimental results of picosecond pulse laser microstructuring of silicon in the SF6 atmosphere using the galvanometer scanning technique. With appropriate irradiation conditions, a large variety of surface microstructures even nanostructures were produced. By rapidly scanning, a uniform array of micro-crater structure with 10nm in depth is generated on the crystal silicon surface. At low scanning speed, large area uniform self-organizing micro-grating, micro-hole, or micro-cone structure can be produced by cumulative pulses irradiation. These results suggest that picosecond laser scanning technique is a flexible method to produce uniform surface micro-nanostructures, which exhibits great potential for applications in photoelectron devices, special surface marking and surface modification.

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