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| 1 | Progress in terahertz nondestructive testing: A review显示文摘Terahertz (THz) waves, whose frequencies range between microwave and infrared, are part of the electromagnetic spectrum. A gap exists in THz literature because investigating THz waves is difficult due to the weak characteristics of the waves and the lack of suitable THz sources and detectors. Recently, THz nondestructive testing (NDT) technology has become an interesting topic. This review outlines several typical THz devices and systems and engineering applications of THz NDT techniques in composite materials, thermal barrier coatings, car paint films, marine protective coatings, and pharmaceutical tablet coatings. THz imaging has higher resolution but lower penetration than ultrasound imaging. This review presents the significance and advantages provided by the emerging THz NDT technique. | Shuncong ZHONG | 2019 | Frontiers of Mechanical Engineering2019，14，3： | 6 |
| 2 | Real-time monitoring of structural vibration using spectral-domain optical coherence tomography显示文摘 | Shuncong Zhong Hao Shen Yaochun Shen | 2010 | Optics and Lasers in Engineering2010，，1： | 2 |
| 3 | Two-dimensional optical coherence tomography forreal-time structural dynamical characterization显示文摘 | ZHONG Jianfeng ZHONG Shuncong ZHANG Qiukun | 2015 | Optics and Lasers in Engineering2015，66，3： | 1 |
| 4 | Crack detection insimply supported beams using stationary wavelettransform of modal data显示文摘 | ZHONG Shuncong OYADIJI S O | 2011 | Structural Control andHealth Monitoring2011，18，2： | 1 |
| 5 | Non-destructive quantification of pharmaceutical tablet coatings using terahertz pulsed imaging and optical coherence tomography显示文摘 | Shuncong Zhong Yao-Chun Shen Louise Ho Robert K. May J. Axel Zeitler Mike Evans Philip F. Taday Michael Pepper Thomas Rades Keith C. Gordon Ronny Müller Peter Kleinebudde | 2010 | Optics and Lasers in Engineering2010，，3： | 1 |
| 6 | Nondestructive Quantification of Pharmaceutical TabletCoatings Using Terahertz Pulsed Imaging and OpticalCoherence Tomography 显示文摘 | Zhong Shuncong Shen Yaochun Ho Louise | 2011 | Optics and Lasers inEngineering (S0143-8166)2011，49，3： | 1 |
| 7 | New Sensing Technologies for Monitoring Machinery,Structures,and Manufacturing Processes显示文摘Sensing is the fundamental technique for sensor data acquisition in monitoring the operation condition of the machinery,structures,and manufacturing processes.In this paper,we briefly discuss the general idea and advances of various new sensing technologies,including multiphysics sensing,smart materials and metamaterials sensing,microwave sensing,fiber optic sensors,and terahertz sensing,for measuring vibration,deformation,strain,acoustics,temperature,spectroscopic,etc.Based on the observations from the state of the art,we provide comprehensive discussions on the possible opportunities and challenges of these new sensing technologies so as to steer future development. | JDMD Editorial Office Zhaoyan Fan Robert X.Gao Qingbo He Yi Huang Tianxi Jiang Zhike Peng Luc Thévenaz Yuyong Xiong Shuncong Zhong | 2023 | Journal of Dynamics, Monitoring and Diagnostics2023，2，2： | 0 |
| 8 | Time of flight improved thermally grown oxide thickness measurement with terahertz spectroscopy显示文摘As a nondestructive testing technique,terahertz time-domain spectroscopy technology is commonly used to measure the thickness of ceramic coat in thermal barrier coatings(TBCs).However,the invisibility of ceramic/thermally grown oxide(TGO)reflective wave leads to the measurement failure of natural growth TGO whose thickness is below 10μm in TBCs.To detect and monitor TGO in the emergence stage,a time of flight(TOF)improved TGO thickness measurement method is proposed.A simulative investigation on propagation characteristics of terahertz shows the linear relationship between TGO thickness and phase shift of feature wave.The accurate TOF increment could be acquired from wavelet soft threshold and cross-correlation function with negative effect reduction of environmental noise and system oscillation.Thus,the TGO thickness could be obtained efficiently from the TOF increment of the monitor area with different heating times.The averaged error of 1.61μm in experimental results demonstrates the highly accurate and robust measurement of the proposed method,making it attractive for condition monitoring and life prediction of TBCs. | Zhenghao ZHANG Yi HUANG Shuncong ZHONG Tingling LIN Yujie ZHONG Qiuming ZENG Walter NSENGIYUMVA Yingjie YU Zhike PENG | 2022 | Frontiers of Mechanical Engineering2022，17，4： | 0 |
| 9 | Terahertz Spectroscopic Characterization and Thickness Evaluation of Internal Delamination Defects in GFRP Composites显示文摘The use of terahertz time-domain spectroscopy(THz-TDS)for the nondestructive testing and evaluation(NDT&E)of materials and structural systems has attracted significant attention over the past two decades due to its superior spatial resolution and capabilities of detecting and characterizing defects and structural damage in non-conducting materials.In this study,the THz-TDS system is used to detect,localize and evaluate hidden multi-delamination defects(i.e.,a three-level multi-delamination system)in multilayered GFRP composite laminates.To obtain accurate results,a wavelet shrinkage de-noising algorithm is used to remove the noise from the measured time-of-flight(TOF)signals.The thickness and location of each delamination defect in the z-direction(i.e.,through-the-thickness direction)are calculated from the de-noised TOF signals considering the interaction between the pulsed THz waves and the different interfaces in the GFRP composite laminates.A comparison between the actual and the measured thickness values of the delamination defects before and after the wavelet shrinkage denoising process indicates that the latter provides better results with less than 3.712%relative error,while the relative error of the non-de-noised signals reaches 16.388%.Also,the power and absorbance levels of the THz waves at every interface with different refractive indices in the GFRP composite laminates are evaluated based on analytical and experimental approaches.The present study provides an adequate theoretical analysis that could help NDT&E specialists to estimate the maximum thickness of GFRP composite materials and/or structures with different interfaces that can be evaluated by the THz-TDS.Also,the accuracy of the obtained results highlights the capabilities of the THz-TDS for the NDT&E of multilayered GFRP composite laminates. | Walter Nsengiyumva Shuncong Zhong Manting Luo Bing Wang | 2023 | Chinese Journal of Mechanical Engineering2023，36，1： | 0 |
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