The nondestructive testing of anti slide pile usually adopts low strain method, high strain method and acoustic transmission method. Low strain detection method is very effective in finding major defects, but it is no...The nondestructive testing of anti slide pile usually adopts low strain method, high strain method and acoustic transmission method. Low strain detection method is very effective in finding major defects, but it is not foolproof;In revealing the integrity of piles, mutual comparison can better explain the problem. The test results can only be used as a reference for the determination of pile defects, and the pile cannot be determined as unqualified only by the results of integrity test. The inspector must fully grasp the pile foundation construction and geological conditions in order to make the most reasonable interpretation of the test results.展开更多
Non-destructive measurement of absolute stress in steel members can provide useful information to optimize the design of steel structures and allow the safety of existing structures to be evaluated.This paper investig...Non-destructive measurement of absolute stress in steel members can provide useful information to optimize the design of steel structures and allow the safety of existing structures to be evaluated.This paper investigates the non-destructive capability of ultrasonic shear-wave spectroscopy in absolute stress evaluation of steel members.The effect of steel-member stress on the shear-wave amplitude spectrum is investigated,and a method of absolute stress measurement is proposed.Specifically,the process for evaluating absolute stress using shear-wave spectroscopy is summarized.Two steel members are employed to investigate the relationship between the stress and the frequency in shear-wave echo amplitude spectrum.The H-beam loaded by the universal testing machine is evaluated by the proposed method and the traditional strain gauge method for verification.The results show that the proposed method is effective and accurate for determining absolute stress in steel members.展开更多
Intelligent perception,as a cutting-edge field of modern science and technology,is profoundly changing our understanding and interaction with the world.With the rapid development of artificial intelligence,the Interne...Intelligent perception,as a cutting-edge field of modern science and technology,is profoundly changing our understanding and interaction with the world.With the rapid development of artificial intelligence,the Internet of things,big data,and other technologies,intelligent perception systems have shown great potential in non-destructive testing,safety monitoring,human-computer interaction,and precision measurement.Traditional sensing technologies face many challenges in complex scenarios or specific needs,while intelligent perception provides a new path for innovation and breakthroughs in instrumentation and sensing technologies through multidisciplinary integration.展开更多
For industrial computed tomography systems, generation II scan mode has a large field of view but time consuming and generation III has a small field of view but fast. In order to realize the rapid ICT test of large ...For industrial computed tomography systems, generation II scan mode has a large field of view but time consuming and generation III has a small field of view but fast. In order to realize the rapid ICT test of large objects, a scan mode based on generation III called large field of view scan was discussed and its reconstruction algorithm based on FBP was deduced. The validity of the algorithm was verified by the results of computer simulation and experiments. Analysis showed that the effective scan field of view could be improved by more than 90% compared with that of generation III.展开更多
Sensing technology is a core component of modern instrument science and technology,playing a crucial role in biomedical diagnosis,food safety,non-destructive testing,environmental monitoring and other fields.With the ...Sensing technology is a core component of modern instrument science and technology,playing a crucial role in biomedical diagnosis,food safety,non-destructive testing,environmental monitoring and other fields.With the interdisciplinary integration of electromagnetics,optics,materials science and artificial intelligence,the research and development of novel sensing mechanisms and materials have continuously driven sensing technology toward high sensitivity,intelligence and miniaturization,becoming a research hotspot in the field.展开更多
Near-infrared(NIR)light devices have great potential in non-destructive testing and biomedicine fields.However,the lack of stable and efficient long wavelength NIR phosphors hinders their development.In this work,util...Near-infrared(NIR)light devices have great potential in non-destructive testing and biomedicine fields.However,the lack of stable and efficient long wavelength NIR phosphors hinders their development.In this work,utilizing the compositional flexibility of antimonate double perovskites,we realized efficient and tunable broadband NIR emissions based on A_(2)MSbO_(6):Cr^(3+)materials(A=Ca,Sr,and Ba;M=Ga,In,Sc,and Y).The NIR emission peaks ranged from 825 to 1010 nm by a composition modulation.In particular,Ca_(2)ScSbO_(6):Cr^(3+)exhibits an 850 nm-centering broadband NIR emission with an internal quantum efficiency of 84.5%and a high thermal quenching temperature,retaining-71%at 410 K of the initial inten-sity at 80 K.Comparatively,Sr_(2)InSbO_(6):Cr^(3+)with a 920 nm-centering broadband emission has 63.2%internal quantum efficiency.This work could help in discovering novel NIR phosphors with long-wave-length emissions and high efficiency.展开更多
Broadband near-infrared(NIR)phosphor-converted light-emitting diodes(pc-LEDs)are considered to be at the forefront of the development of next-generation NIR light sources.However,the performance of NIR pc-LEDs is seve...Broadband near-infrared(NIR)phosphor-converted light-emitting diodes(pc-LEDs)are considered to be at the forefront of the development of next-generation NIR light sources.However,the performance of NIR pc-LEDs is severely limited due to the narrow band emission,low quantum efficiency,and thermal quenching of NIR-emitting materials.Herein,an efficient and thermally stable broadband NIR LaMgGa_(11)O_(19):Cr^(3+),Yb^(3+)(LMG:Cr^(3+),Yb^(3+))phosphor has been successfully designed by[Cr^(3+)-Yb^(3+)]codoping.The broadband emission phenomenon of LaMgGa_(11)O_(19):Cr^(3+)was confirmed to be due to selective lattice occupancy of Cr^(3+)ions based on the analysis of crystal structures,crystal field calculations,and fluorescence lifetimes.The NIR emission spectra in the range of 1000-1200 nm were enriched by using the highly efficient energy transfer of Cr^(3+)→Yb^(3+)ions and the energy transfer mechanism is discussed in detail.The prepared LMG:Cr^(3+),Yb^(3+)phosphors exhibit highly efficient ultra-broadband NIR emission from 650 to 1200 nm under 440 nm excitation with high internal and external quantum efficiencies of 94.2%/40.5% and excellent luminescence thermal stability of 89.3%@373 K.A NIR pc-LED prototype was fabricated by combining the optimized phosphor with a commercial 440 nm blue LED chip,providing 84.5 mW NIR output power at a 350 mA driving current.Finally,the potential applications of the phosphor in night vision lighting and non-destructive testing were demonstrated.The results show that this work is expected to provide a new strategy for efficient ultra-broadband NIR phosphor design.展开更多
A laser ultrasonics generation and non contact detection system has been developed. The weak generated ultrasonic signal of nanosecond duration and nanometer amplitude can be detected with a confocal Fabry Perot int...A laser ultrasonics generation and non contact detection system has been developed. The weak generated ultrasonic signal of nanosecond duration and nanometer amplitude can be detected with a confocal Fabry Perot interferometer (CFPI). It can be applied to determination of elastic constants of material and flaw detection. The experimental results show that laser ultrasonic technique is practical and effective.展开更多
文摘The nondestructive testing of anti slide pile usually adopts low strain method, high strain method and acoustic transmission method. Low strain detection method is very effective in finding major defects, but it is not foolproof;In revealing the integrity of piles, mutual comparison can better explain the problem. The test results can only be used as a reference for the determination of pile defects, and the pile cannot be determined as unqualified only by the results of integrity test. The inspector must fully grasp the pile foundation construction and geological conditions in order to make the most reasonable interpretation of the test results.
基金supported by the National Key Research and Development Program of China (No. 2016YFC0701102)the National Nature Science Foundation of China(No.51538003)the Shenzhen Technology Innovation Program (No.JSGG20150330103937411)
文摘Non-destructive measurement of absolute stress in steel members can provide useful information to optimize the design of steel structures and allow the safety of existing structures to be evaluated.This paper investigates the non-destructive capability of ultrasonic shear-wave spectroscopy in absolute stress evaluation of steel members.The effect of steel-member stress on the shear-wave amplitude spectrum is investigated,and a method of absolute stress measurement is proposed.Specifically,the process for evaluating absolute stress using shear-wave spectroscopy is summarized.Two steel members are employed to investigate the relationship between the stress and the frequency in shear-wave echo amplitude spectrum.The H-beam loaded by the universal testing machine is evaluated by the proposed method and the traditional strain gauge method for verification.The results show that the proposed method is effective and accurate for determining absolute stress in steel members.
文摘Intelligent perception,as a cutting-edge field of modern science and technology,is profoundly changing our understanding and interaction with the world.With the rapid development of artificial intelligence,the Internet of things,big data,and other technologies,intelligent perception systems have shown great potential in non-destructive testing,safety monitoring,human-computer interaction,and precision measurement.Traditional sensing technologies face many challenges in complex scenarios or specific needs,while intelligent perception provides a new path for innovation and breakthroughs in instrumentation and sensing technologies through multidisciplinary integration.
文摘For industrial computed tomography systems, generation II scan mode has a large field of view but time consuming and generation III has a small field of view but fast. In order to realize the rapid ICT test of large objects, a scan mode based on generation III called large field of view scan was discussed and its reconstruction algorithm based on FBP was deduced. The validity of the algorithm was verified by the results of computer simulation and experiments. Analysis showed that the effective scan field of view could be improved by more than 90% compared with that of generation III.
文摘Sensing technology is a core component of modern instrument science and technology,playing a crucial role in biomedical diagnosis,food safety,non-destructive testing,environmental monitoring and other fields.With the interdisciplinary integration of electromagnetics,optics,materials science and artificial intelligence,the research and development of novel sensing mechanisms and materials have continuously driven sensing technology toward high sensitivity,intelligence and miniaturization,becoming a research hotspot in the field.
基金supported by the National Natural Science Foundation of China(no.51972020 and no.51832005).
文摘Near-infrared(NIR)light devices have great potential in non-destructive testing and biomedicine fields.However,the lack of stable and efficient long wavelength NIR phosphors hinders their development.In this work,utilizing the compositional flexibility of antimonate double perovskites,we realized efficient and tunable broadband NIR emissions based on A_(2)MSbO_(6):Cr^(3+)materials(A=Ca,Sr,and Ba;M=Ga,In,Sc,and Y).The NIR emission peaks ranged from 825 to 1010 nm by a composition modulation.In particular,Ca_(2)ScSbO_(6):Cr^(3+)exhibits an 850 nm-centering broadband NIR emission with an internal quantum efficiency of 84.5%and a high thermal quenching temperature,retaining-71%at 410 K of the initial inten-sity at 80 K.Comparatively,Sr_(2)InSbO_(6):Cr^(3+)with a 920 nm-centering broadband emission has 63.2%internal quantum efficiency.This work could help in discovering novel NIR phosphors with long-wave-length emissions and high efficiency.
基金supported by the National Natural Science Foundation of China(No.12274144,22361132525,and 52472161)the Guangdong Provincial Science and Technology Project(No.2022A1515010229)+1 种基金the Russian Science Foundation(grant 24-43-00006)the Undergraduate Innovation and Entrepreneurship Training Program grant for Zixi Chen.
文摘Broadband near-infrared(NIR)phosphor-converted light-emitting diodes(pc-LEDs)are considered to be at the forefront of the development of next-generation NIR light sources.However,the performance of NIR pc-LEDs is severely limited due to the narrow band emission,low quantum efficiency,and thermal quenching of NIR-emitting materials.Herein,an efficient and thermally stable broadband NIR LaMgGa_(11)O_(19):Cr^(3+),Yb^(3+)(LMG:Cr^(3+),Yb^(3+))phosphor has been successfully designed by[Cr^(3+)-Yb^(3+)]codoping.The broadband emission phenomenon of LaMgGa_(11)O_(19):Cr^(3+)was confirmed to be due to selective lattice occupancy of Cr^(3+)ions based on the analysis of crystal structures,crystal field calculations,and fluorescence lifetimes.The NIR emission spectra in the range of 1000-1200 nm were enriched by using the highly efficient energy transfer of Cr^(3+)→Yb^(3+)ions and the energy transfer mechanism is discussed in detail.The prepared LMG:Cr^(3+),Yb^(3+)phosphors exhibit highly efficient ultra-broadband NIR emission from 650 to 1200 nm under 440 nm excitation with high internal and external quantum efficiencies of 94.2%/40.5% and excellent luminescence thermal stability of 89.3%@373 K.A NIR pc-LED prototype was fabricated by combining the optimized phosphor with a commercial 440 nm blue LED chip,providing 84.5 mW NIR output power at a 350 mA driving current.Finally,the potential applications of the phosphor in night vision lighting and non-destructive testing were demonstrated.The results show that this work is expected to provide a new strategy for efficient ultra-broadband NIR phosphor design.
文摘A laser ultrasonics generation and non contact detection system has been developed. The weak generated ultrasonic signal of nanosecond duration and nanometer amplitude can be detected with a confocal Fabry Perot interferometer (CFPI). It can be applied to determination of elastic constants of material and flaw detection. The experimental results show that laser ultrasonic technique is practical and effective.
