ISSN 1004-4140
CN 11-3017/P
LI Zhang-zheng, SHI Fang-fang, WU He-zhen. Research on Inspecting Concrete Flaws with LFM Signal[J]. CT Theory and Applications, 2014, 23(1): 19-26.
Citation: LI Zhang-zheng, SHI Fang-fang, WU He-zhen. Research on Inspecting Concrete Flaws with LFM Signal[J]. CT Theory and Applications, 2014, 23(1): 19-26.

Research on Inspecting Concrete Flaws with LFM Signal

More Information
  • Received Date: January 13, 2013
  • Available Online: December 09, 2022
  • On account of existing problems of ultrasonic inspecting concrete defect,such as low signal noise ratio(SNR) and limited penetrating depth,the method of exciting with LFM is put forward.Linear frequency modulation(LFM) signal with the characteristics of long time series and wide band width is excited at transmitting terminal,and compressed signal with narrower main lobe and higher SNR will be obtained at receiving terminal through compression method.The effect of transducer's bandwidth is analyzed.The results of numerical calculation show that good compressed results of echo will be obtained if there is much noise.Testing results show that pulse compression method can improve signal-noise ratio.
  • Related Articles

    [1]LI Yangsen, QIN Dewen, LIU Qingwen, WANG Xiaopei, Liu Xiaohui. Research on the Identification of Sandstone Vanishing Points Based on Synchronous Compression Matching Pursuit Method[J]. CT Theory and Applications, 2024, 33(5): 551-560. DOI: 10.15953/j.ctta.2024.001
    [2]CHEN Yun-bin, WANG Yuan, LIU Qing-hua. Several Methods for Reducing the Dose of Cone Beam CT[J]. CT Theory and Applications, 2017, 26(3): 327-334. DOI: 10.15953/j.1004-4140.2017.26.03.09
    [3]XIAO Kai-pan, ZHANG Da, ZHANG Fan-chang. The Bayes Sparse Spike Inversion Based on Spatial Variable Impedance Coefficient[J]. CT Theory and Applications, 2015, 24(6): 809-817. DOI: 10.15953/j.1004-4140.2015.24.06.06
    [4]HE Tai-ming, LIU Zheng-yi, LI Shi-yu. Experimental Studies of Ultrasonic Tomography on Fangshan Granite under Uniaxial Compression[J]. CT Theory and Applications, 2015, 24(5): 657-665. DOI: 10.15953/j.1004-4140.2015.24.05.03
    [5]ZHOU Chun-yan, LI Bo, DING Hou-ben. The Study of A Newly-mode Embedded Multi-channel Pulse Amplitude Analyzer[J]. CT Theory and Applications, 2015, 24(1): 69-77. DOI: 10.15953/j.1004-4140.2015.24.01.08
    [6]LI Shou-tao, CHEN Hao, CHEN Si, LI Jing. Image ROI Selection and its Application[J]. CT Theory and Applications, 2014, 23(6): 979-984.
    [7]LIU Yu-ping, LI Li-qing, XUE Hua, DENG Gui-lin, ZHANG Bao-jin. Frequency Shift Processing for the Hypocenter with Short-term Single-frequency Pulse in the Ocean Sub-bottom Profile Data[J]. CT Theory and Applications, 2014, 23(2): 227-235.
    [8]LI Zhang-zheng, SHI Fang-fang, WU He-zhen. Research on Inspecting Concrete Flaws with LFM Signal[J]. CT Theory and Applications, 2014, 23(1): 19-26.
    [9]JIAO Peng-fei, LI Liang, ZHAO Ji. New Advances of Compressed Sensing in Medical Image Reconstruction[J]. CT Theory and Applications, 2012, 21(1): 133-147.
    [10]WU He-zhen, HE Tai-ming. Simulation Study on Coded Excitation in Rock Property Ultrasound Imaging[J]. CT Theory and Applications, 2010, 19(4): 45-52.

Catalog

    Article views (765) PDF downloads (3) Cited by()
    Related

    /

    DownLoad:  Full-Size Img  PowerPoint
    Return
    Return