Jinlong Li

Jiangxi University of Finance and Economics

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Xiaorong Gao

Southwest Jiaotong University

Lin Luo

Chinese Academy of Sciences

Hairong Guo

Shenyang Agricultural University

Jianping Peng

Southwest Jiaotong University

Xiaorong Gao

Tsinghua University

Yuanxi Yang

Xi'an Railway Survey and Design Institute

Haibo He

Beijing Satellite Navigation Center

Jianqiang Guo

Second Hospital of Shandong University

Tao Peng

Southwest Jiaotong University

Jianjie Xu

Shenzhen University

Cooperative Institutions

Southwest Jiaotong University

Chinese Academy of Sciences

Beijing Satellite Navigation Center

Huazhong University of Science and Technology

PLA Information Engineering University

Harbin Institute of Technology

University of Chinese Academy of Sciences

Shenzhen University

Chongqing University

Shanghai International Studies University

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Method of ultrasonic phased array imaging based on segment amplitude apodization

Jianqiang Guo Lin Chen Yu Zhang Kai Yang Jinlong Li

Single amplitude apodization technology applied in ultrasound imaging system can obtain better imaging resolution only within a certain distance, outside of this range the resolution is significantly lower, while using segment dynamic apodization technique can make up for this shortfall. Therefore, we make an analysis and research on the basis of the beams about the 3 dB equivalent distribution with a variety of single amplitude apodization functions, and observe to come to the best imaging resolution range for each function, then calculate the dynamic weighting value by establishing a linear phased array sound field simulation model, thus find a way to achieve segment dynamic amplitude apodization, and draw the 3 dB contour and the distribution of sound field to prove the feasibility of this technique.

Apodization

Aperture (computer memory)

10.1109/fendt.2013.6635552

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Citations (5)

Wedge two-layer medium ultrasonic plane wave compounding imaging based on sign multiply coherence factor combined with delay multiply and sum beamforming

NDT & E International (2021)

Lin Luo Yuanhao Tan Jinlong Li Yu Zhang Xiaorong Gao

Wedge (geometry)

Compounding

Spatial coherence

10.1016/j.ndteint.2021.102601

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Citations (11)

Ultrasonic adaptive plane wave high-resolution imaging based on convolutional neural network

NDT & E International (2023)

Fuben Zhang Lin Luo Jinlong Li Jianping Peng Yu Zhang

Ultrasonic imaging

10.1016/j.ndteint.2023.102891

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Citations (9)

Parameters measurement of wheel set using three-dimensional profile reconstruction

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE (2011)

Li Wang Li-rong Jiang Jinlong Li Lin Luo

The defects of wheel sets seriously affect the train operation safety which of problem to be solved. A method of detecting the wheel sets defect is investigated through the three-dimension profile. The three-dimension profile reconstruction of wheel sets is realized by combining two-dimension CCD imaging with line laser and encoder. The theoretical derivation of detecting principle is established, and the factors of influencing the measurement accuracy are analyzed. An algorithm is set to processing measurement data, the main parameters of wheel set are obtained, including flange thickness, flange height, vertical wear (QR) and tread wear. The results of simulations and field experiments show that the proposed method can detect the faults on the wheel correctly, and satisfy the requirements of high efficient and accurate.

Flange

Line (geometry)

Rotary encoder

10.1117/12.905167

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Can firms with higher ESG ratings bear higher bank systemic tail risk spillover?—Evidence from Chinese A-share market

Pacific-Basin Finance Journal (2023)

Aifan Ling Jinlong Li Yugui Zhang

Spillover effect

Uncorrelated

10.1016/j.pacfin.2023.102097

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Citations (10)

Benefits of BDS-3 B1C/B1I/B2a triple-frequency signals on precise positioning and ambiguity resolution

GPS Solutions (2020)

Jinlong Li Yuanxi Yang Haibo He Hairong Guo

Ambiguity Resolution

Precise Point Positioning

10.1007/s10291-020-01016-8

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Citations (34)

Hybrid Ultrasonic TOFD Imaging of Weld Flaws Using Wavelet Transforms and Image Registration

Journal of Nondestructive Evaluation (2018)

Jiaxu Duan Lin Luo Xiaorong Gao Jianping Peng Jinlong Li

10.1007/s10921-018-0476-2

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Contribution of the Compass satellite navigation system to global PNT users

Chinese Science Bulletin (2011)

Yuanxi Yang Jinlong Li Junyi Xu Tang Jing Hairong Guo

Compass

Dilution of precision

GNSS augmentation

GLONASS

Visibility

Quasi-Zenith Satellite System

Galileo (satellite navigation)

10.1007/s11434-011-4627-4

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Citations (275)

Discussions on applications of Arnold transformation in binary image scrambling

JOURNAL OF SHENZHEN UNIVERSITY SCIENCE AND ENGINEERING (2015)

Rijun Liao Xiongjun Li Jianjie Xu Jinlong Li Jianbiao Xian

Scrambling

10.3724/sp.j.1249.2015.04428

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Efficiency improvement of total focusing imaging based on sparse array method

Tao Peng Jianping Peng Hua Peng Li Wang Xiaorong Gao

In this paper, a design concept of sparse array is applied to total focusing imaging technique. During the process, the elements of a phased array are partially selected according to the theory of effective aperture, in order to reduce the amount of captured data and shorten the processing time of TFM imaging. Simulated imaging with Field II program and experimental verification on two standard phased array specimens are performed, based on three selected arrays which are sparsely as 1/2, 1/4 and 1/8. The results compared with the full array in terms of image quality and computing efficiency, show that the computing efficiency of TFM imaging can get a rise of 40 percent by adopting the sparse array design. Meanwhile, an approximate resolution can be achieved at the lowest array sparse rate of 1/4. Affected by the side-lobes of the ultrasonic beam, contrast of the image may suffer little loss.

Sparse array

Phased array ultrasonics

Aperture (computer memory)

Phased-array optics

Array data structure

10.1109/fendt.2014.6928233

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Citations (1)