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A comparative study on water and dry coupling in photoacoustic tomography of the finger joints

Journal of Innovative Optical Health Sciences 2020年第4期3卷 1-9页

作者： Qiquan Shang Man Wu Jinge Yang Ten Pan Guang Zhang Dan Wu Huabei Jiang School of Electronic Science and Engineering(National Exemplary School of Microelectronics)University of Electronic Science and Technology of China Chengdu 611731 P.R.China Center for Information in Medicine University of Electronic Science and Technology of China Chengdu 611731 P.R.China Department of Medical Engineering University of South Florida Tampa 33620USA

We present a systematical study on comparison between water and dry coupling in photoacoustic tomography of the humanfinger *** to the direct water immersion of thefinger for water coupling,the dry coupling is realized through a transparent PDMSfilm-based water bag,which ensures water-free contact with the *** results obtained suggest that the dry cou-pling provides image quality comparable to that by water coupling while eliminating the wrin-kling of thefinger joint caused by the water *** addition,the dry coupling offers more stable hemodynamic images than the water coupling as the water immersion of thefinger joint causes reduction in blood vessel size.

关键词： Photoacoustic tomography dry coupling water coupling finger joints

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Research and Application of Log Defect Detection and Visualization System Based on dry coupling Ultrasonic Method

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Journal of Renewable Materials 2023年第11期11卷 3917-3932页

作者： Yongning Yuan Dong Zhang Usama Sayed Hao Zhu Jun Wang Xiaojun Yang Zheng Wang College of Mechanical and Electronic Engineering Nanjing Forestry UniversityNanjing210037China College of Materials Science and Engineering Nanjing Forestry UniversityNanjing210037China College of Civil Engineering Nanjing Forestry UniversityNanjing210037China College of Information Science and Technology Nanjing Forestry UniversityNanjing210037China

In order to optimize the wood internal quality detection and evaluation system and improve the comprehensive utilization rate of wood,this paper invented a set of log internal defect detection and visualization system by using the ultrasonic dry coupling agent *** detection and visualization analysis of internal log defects were realized through log specimen *** main conclusions show that the accuracy,reliability and practicability of the system for detecting the internal defects of log specimens have been effectively *** system can make the edge of the detected image smooth by interpolation algorithm,and the edge detection algorithm can be used to detect and reflect the location of internal defects of logs *** content mentioned above has good application value for meeting the requirement of increasing demand for wood resources and improving the automation level of wood nondestructive testing instruments.

关键词： Ultrasonic method log defect detection visualization system dry coupling B-scan pulse transmission method bilinear image interpolation algorithm edge detection algorithm

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EXPERIMENTAL RESEARCH ON THE ULTRASONIC TECHNIQUE AND ITS APPLICATION IN STUDYING ROCK PROPERTIES

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Journal of China University of Mining and Technology 1992年第1期30卷 44-55页

作者：孙永联周楚良余学东姜耀东 Department of Mining Engineering

The experimental installation and measurement system of ultrasonic wave property in rocks during complete stress-strain process were established and perfected. The interrelations between ultrasonic wave property of muds tone, sands tone and limestone specimens during complete stress-strain process and their mechanic property were investigated. A new type of device for the observation of surrounding rock stability-borehole ultrasonic device with completely dry coupling was developed to get better coupling and more accurate measurement data comparing with those of water coupling situation. Preliminary study on the application of ultrasonic measurement technique at belt conveyor roadway of north wing in Baodian Coal Mine (Shandong province) was conducted. Based on the interrelations between the complete stress-strain properties of specimens and their wave properties, the structural properties of surrounding rocks, the range of yield zones, and the change of stresses within surrounding rocks when a longwall face was across over the roadway were ***,a new and feasible way was found for the research on the deformation law of surrounding rock of roadway and rational selection of support parameters.

关键词： ultrasonic wave wave-spectrum analysis complete stress-strain process dry coupling

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EXPERIMENTAL RESEARCH ON THE ULTRASONIC TECHNIQUE AND ITS APPLICATION IN STUDYING ROCK PROPERTIES

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International Journal of Mining Science and Technology 1992年 46-57页

作者：孙永联周楚良余学东姜耀东 Department of Mining Engineering

The experimental installation and measurement system of ultrasonic wave property in rocks during complete stress-strain process were established and perfected. The interrelations between ultrasonic wave property of mudstone,sandstone and limestone specimens during complete stress-strain process and their mechanic property were investigated. A new type of device for the observation of surrounding rock stability—borehole ultrasonic device with completely dry coupling was developed to get better coupling and more accurate measurement data comparing with those of water coupling situation. Preliminary study on the application of ultrasonic measurement technique at belt conveyor roadway of north wing in Baodian Coal Mine (Shandong province) was conducted. Based on the interrelations between the complete stress-strain properties of specimens and their wave properties, the structural properties of surrounding rocks, the range of yield zones, and the change of stresses within surrounding rocks when a longwall f

关键词： ultrasonic wave wave-spectrum analysis complete stress-strain process dry coupling

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