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A deformation measurement method based on surface texture information of rocks and its application

International Journal of Mining Science and Technology 2023年第9期33卷 1117-1130页

作者： Yanbo Zhang Xin Han Peng Liang Xulong Yao Qun Li Guangyuan Yu Qi Wang College of Mining Engineering North China University of Science and TechnologyTangshan 063210China Green Intelligent Mining Technology Innovation Center of Hebei Province Tangshan 063210China Key Laboratory for Geo-mechanics and Deep Underground Engineering China University of Mining and Technology-BeijingBeijing 100083China

Users of the digital image correlation method are faced with the problem of poor operability,low repeatability,and lack of standardized specifications for spraying *** solve the problem,the research proposed a rock deformation measurement method that obviates the need to spray speckles.A local binary model was established by using the local binary pattern(LBP)operator based on deep texture features on rock *** resulting LBP digital speckle pattern can substitute artificial speckle patterns and demonstrates high quality and strong *** on the LBP digital speckle pattern,the target tracking algorithm was employed to achieve non-contact measurement of the dynamic displacements of *** feasibility and effectiveness of the algorithm in practical application were verified by conducting shear tests on granite and *** results show that the deformation characteristics in the displacement nephograms are in line with the measured data pertaining to rock fracturing and conform to the basic characteristics of the shear failure of *** deformation measurement method based on surface texture information can realize non-contact displacement measurement of rocks under conditions without speckles:this obviates the influence of the quality of sprayed speckles on the accuracy of the measurement of deformation.

关键词： deformation measurement Texture information Digital speckle Local binary model Target tracking algorithm

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deformation measurement of Glass Structure Using FBG Sensor

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Photonic Sensors 2019年第4期9卷 367-375页

作者： Bin LIU Shihai ZHANG Jianping HE School of Electronic and Electrical Engineering Nanyang Institute of TechnologyNanyang 473001China School of Civil Engineering Nanyang Institute of TechnologyNanyang 473001China School of Civil Engineering Dalian University of TechnologyDalian 116024China

Glass has been widely used as an important component in structures such as reflection glass curtainwalls,high speed trains,and landscape glass bridges with advantages of transparent and easy to clean,which are exposed to extreme weather conditions and external *** time,these factors can lead to a damage of *** the health status of glass structure is critical,which should be routinely monitored to improve safety and provide reliable maintenance *** this paper,fiber Bragg grating(FBG)sensors are used to monitor glass damage based on the fact that the main components of both the optical fiber and the glass are silica,which hints that both optical fiber and glass have the similar mechanical ***,the diameter of FBG installed on the glass structure is small,which has little effect on the beauty of *** order to validate the feasibility of the damage monitoring method,one common glass panel model with two-side fixations is loaded impact and static loads respectively,on the upper and lower surfaces of which four FBG sensors and two resistance strain gages are installed.A comparison study among the measured strains from the FBG sensors,those from the resistance strain gages,and those calculated from finite element model(FEM)analysis is conducted and the result obtained with experiments agrees with the element *** results show that the FBG sensors can effectively measure the glass deformation or damage under the impact and static load.

关键词： FBG sensor deformation measurement glass structure safety monitoring

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Bam earthquake: Surface deformation measurement using radar interferometry

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Acta Seismologica Sinica(English Edition) 2005年第4期18卷 451-459,500页

作者：夏耶 GeoForschungsZentrumPotsdam Telegrafenberg A17 D-14473 Potsdam Germany

On the 26th December 2003 an earthquake with MW=6.5 shook a large area of the Kerman Province in Iran. The epicenter of the devastating earthquake was located near the city of Bam. This paper described the application of differential synthetic aperture radar interferometry (D-INSAR) and ENVISAT ASAR data to map the coseismic surface deformation caused by the Bam earthquake including the interferometric data processing and results in detail. Based on the difference in the coherence images before and after the event and edge search of the deforma- tion field, a new fault ruptured on the surface was detected and used as a data source for parameter extraction of a theoretical seismic modeling. The simulated deformation field from the model perfectly coincides with the result derived from the SAR interferometric measurement.

关键词： microwave remote sensing SAR interferometry earthquake deformation measurement

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Videometric research on deformation measurement of large-scale wind turbine blades

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Theoretical & Applied Mechanics Letters 2011年第1期1卷 22-24页

作者： Xiangyi Sun,Yun Yuan,~(a))Zhaokun Zhu,Xiaohu Zhang,and Qifeng Yu College of Aerospace and Materials Engineering,National University of Defense Technology,Changsha 410073, Hunan,China College of Aerospace and Materials Engineering National University of Defense Technology Changsha 410073 Hunan China

Utilization of wind energy is a promising way to generate power,and wind turbine blades play a key role in collecting the wind energy *** paper attempts to measure the deformation parameter of wind turbine blades in mechanics experiments using a videometric method. In view that the blades experience small buckling deformation and large integral deformation simultaneously, we proposed a parallel network measurement(PNM) method including the key techniques such as camera network construction,camera calibration,distortion correction,the semi-automatic high-precision extraction of targets,coordinate systems unification,and bundle adjustment,etc. The relatively convenient construction method of the measuring system can provide an abundant measuring content,a wide measuring range and post *** experimental results show that the accuracy of the integral deformation measurement is higher than 0.5 mm and that of the buckling deformation measurement higher than 0.1mm.

关键词： videometrics deformation measurement wind turbine blades large-scale integral deformation buckling deformation

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Application of 3D Projection Profilometry in the High Speed Impaction Surface deformation measurement Research

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Journal of Signal and Information Processing 2020年第4期11卷 103-115页

作者： Eryi Hu School of Mechatronic Engineering China University of Mining and Technology Xuzhou China Jiangsu Key Laboratory of Mine Mechanical and Electrical Equipment China University of Mining and Technology Xuzhou China

In order to study the strength of the composite material plate problems, need to adopt a nondestructive testing method to obtain the specimen surface under the effect of high-speed impact regularity of shape. The projection profilometry was used to measure the surface profile or the full field deformation. Furtherly, by using the Fourier transform algorithm, there is only one frame of captured image which is needed in the measurement, so that it can be introduced into the high speed impaction procedure measurement. An experimental system, which was contained with an impact setup and the projection profilometry measurement part, was constructed for the impaction action characteristic research. The metallic impact object can be launched by a gas gun or a spin fan, respectively. The detected object is manufactured by composite materials. In order to increase the surface deformation measurement accuracy, the calibration method and the error was discussed with different calibration specimen. And then, the proposed profilometry measurement method is proved by the gas gun and spin fan projectile test. The surface deformation of the manufactured composite plates and fan case are measured in the impaction procedure. So that the impact action details can be described much more clearly than the traditional video monitoring method.

关键词： Projection Profilometry Fourier Transform Algorithm deformation measurement Impaction Monitoring

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Estimation of the bi-modulus of materials through deformation measurement in a Brazilian disk test

Estimation of the bi-modulus of materials through deformatio...

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中国科学院地质与地球物理研究所2012年度（第12届）学术年会

作者： J.H.Ye F.Q.Wu Y.Zhang H.G.Ji Key Laboratory of Engineering Geomechanics Institute of Geology and GeophysicsChinese Academy of Sciences Department of Civil and Environmental Engineering University of Science and Technology Beijing

A completely analytical experimental theory is developed to determine the elastic tensile modulus E and the elastic compressive modulus E of materials simultaneously through the deformation and displacement measurement in the Brazilian disk loaded by a pair of radial concentrated *** on the proposed test theory,there are totally four kinds of estimation methods *** groups of experimental data are used to validate the proposed test *** analysis indicates that the estimated E and E of materials have high reliability when measured horizontal and vertical displacements on the diameters are used *** measurement error of displacement results in that the estimated E and E of materials follow the t location-scale distribution very *** validation works indicate that the proposed test method is feasible and liable,and is convenient to determine the E and E of materials simultaneously through the simple indirect tension test(the Brazilian disk test).

关键词： Elastic tensile modulus Elastic compressive modulus Bi-modulus Brazilian disk test Rock mass deformation measurement

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A novel technique for measuring 3D deformation of adhesively bonded single lap joint

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Science China(Physics,Mechanics & Astronomy) 2016年第1期59卷 58-65页

作者： Bing Pan LuJun Ma Yong Xia Institute of Solid Mechanics Beihang University State Key Lab of Automotive Safety and Energy Tsinghua University

An easy-to-implement yet practical single-camera microscopic stereo-digital image correlation(stereo-DIC) technique is proposed for surface three-dimensional(3D) deformation measurement of singe lap joint(SLJ) samples subjected to mechanical loads. The basic principles, optical configurations and implementation procedures of the proposed technique are described in detail. Compared with existing single-camera 2D-DIC technique, which has been regularly used for in-plane deformation measurement of a SLJ specimen, the proposed technique offers the special merit of simultaneously determining all the three displacement components by simply adding two additional optical elements to existing single-camera 2D-DIC systems. The accuracy and effectiveness of the proposed technique is demonstrated by measuring the 3D deformation of a SLJ specimen subjected to quasi-static tensile loads.

关键词： digital image correlation single lap joint deformation measurement

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A deformation and 3D-shape measurement system based on phase-shifting digital holography

A deformation and 3D-shape measurement system based on phase...

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实验力学国际会议

作者： Songcan Lai Ervin Kolenovic Wolfgang Osten Werner Juptner BIAS GmbH Klagenfurter Str. 2 28359 Bremen Germany

＜正＞ This paper presents an endoscopic digital holographic interferometry system which is based on phase-shifting in-line digital holography. The system is able to measure both the shape and deformation of an object with the advantages of digital holography, such as real-time processing of the hologram. Two theoretical problems are briefly described: phase-shifting in-line holography and hologram data re-sampling for 2-wavelength contouring. In addition, initial experimental results of the deformation of a metal piece and surface 3D-shape measurement of a bottle cap are given.

关键词： Digital holography phase-shifting deformation measurement shape measurement.

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Bi-prism-based single-lens three dimensional digital image correlation system with a long working distance: Methodology and application in extreme high temperature deformation test

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Science China(Technological Sciences) 2018年第1期61卷 37-50页

作者： WU LiFu YIN YuanJie ZHANG Qi FANG DaiNing ZHANG RuBing ZHU JianGuo XIE HuiMin AML Department of Engineering Mechanics Tsinghua University Institute of Advanced Structure Technology Beijing Institute of Technology Department of Mechanics School of Civil Engineering Beijing Jiaotong University Faculty of Civil Engineering and Mechanics Jiangsu University

As a novel three dimensional digital image correlation （3D DIC） method, the bi-prism-based single lens （BSL） 3D DIC method has been proposed and developed in recent years. Making use ofa bi-prism, this method is able to perform a 3D DIC measurement using only a single camera. Thus, the integration level of a BSL 3D DIC system could be much higher than that of the double-camera 3D DIC system. In this paper, using a small-angle bi-prism and a camera with a longer focal length, a special BSL 3D DIC system with a long working distance is designed for measurements in extreme environments. The principle of the system is first studied, and practical methods are then proposed for the system set-up and the determination of system parameters. Then, feasibility of the measurement system is verified by out-of-plane rigid-body translation tests. Finally, the BSL 3D DIC system is proven to be capable of combining with a high-temperature testing instrument to perform deformation tests in a high-temperature environment of up to 1500℃.

关键词： three dimensional digital image correlation(3D DIC) single lens bi-prism high temperature deformation measurement

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A deformation and 3D-shape measurement system based on phase-shifting digital holography

A deformation and 3D-shape measurement system based on phase...

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ICEM 2001 The 3～(rd) International Conference on Experimental Mechanics

作者： Ervin Kolenovi Wolfgang Osten Werner Jüptner BIAS GmbH Klagenfurter Str. 2 28359 Bremen Germany BIAS GmbH Klagenfurter Str. 2 28359 Bremen Germany BIAS GmbH Klagenfurter Str. 2 28359 Bremen Germany

＜正＞ Digital holography provides the possibility to combine deformation measurement and surface contouring in one experimental setup. However, digital holography systems are commonly available only as laboratory setups. Due to a number of disadvantages those laboratory setups are not suitable to realize a flexible digital holography system that can easily be used in different environments, such as in cavities. In this paper we introduce a highly optimized measurement system based on digital holography which was especially designed to be used as an endoscopic sensor. The system is able to measure both the shape and the deformation of an object. The sensor makes it possible to use the advantages of digital holography and additionally it has a high flexibility. To realize this kind of system the sensor module itself as well as the reconstruction algorithm have to be applied several demands. These demands include a small sensor size, the ability to measure relatively large objects and a high processing *** very small dimensions of the sensor could only be achieved by the use of analog inspection cameras. To take full advantage of the space bandwidth product （SBW） of these CCD devices, in-line holography in combination with temporal phase-shifting has been used. This gives the possibility to investigate larger objects than by using off-axis recording setup. In order to receive a high processing speed a new algorithm which was recently introduced by the authors was used to eliminate the complex conjugated twin image and the zero order beam in in-line holography. Concerning this application the algorithm shows relevant advantages compared to other known *** experimental results presented in this paper include deformation measurements as well as shape measurements, both recorded with a first prototype of the introduced system. Those examples demonstrate that the developed system makes digital holography a useful tool even outside of a laboratory and that the me

关键词： Digital holography phase-shifting deformation measurement shape measurement

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