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LFM激励信号在超声TOFD检测中的应用

丛森, 刚铁, 张佳莹, 盛朝阳

丛森, 刚铁, 张佳莹, 盛朝阳. LFM激励信号在超声TOFD检测中的应用[J]. 焊接学报, 2015, 36(2): 63-66.
引用本文: 丛森, 刚铁, 张佳莹, 盛朝阳. LFM激励信号在超声TOFD检测中的应用[J]. 焊接学报, 2015, 36(2): 63-66.
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CONG Sen, GANG Tie, ZHANG Jiaying, SHENG Zhaoyang. Application of LFM excitation signals to ultrasonic TOFD test[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2015, 36(2): 63-66.
Citation: CONG Sen, GANG Tie, ZHANG Jiaying, SHENG Zhaoyang. Application of LFM excitation signals to ultrasonic TOFD test[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2015, 36(2): 63-66.
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LFM激励信号在超声TOFD检测中的应用

  • 哈尔滨工业大学先进焊接与连接国家重点实验室, 哈尔滨 150001

基金项目: 国家自然科学基金资助项目(51175113,51105033);国际合作资助项目(2007DFR70070)

Application of LFM excitation signals to ultrasonic TOFD test

  • State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China

摘要

    摘要
  • 摘要: 对于大厚度焊接试件的超声衍射时差法检测(time of flight diffraction, TOFD),常规超声激励难以同时满足信噪比、检测距离以及检测分辨率的要求.文中将线性调频脉冲压缩技术应用在超声TOFD检测中,线性调频(linear frequency modulated, LFM)激励可综合改善检测信噪比(signal to noise ratio, SNR)与分辨率.首先对试验用10 MHz超声换能器进行了LFM信号参数测试,选择了合适的时宽和带宽.对埋藏3 mm高的横槽缺陷的钢板分别进行了超声LFM激励的TOFD检测及常规超声TOFD检测,对比发现超声LFM激励的TOFD检测精度高达0.01μs,可准确区分缺陷上下端衍射波.在较低的激励电压和系统增益下,实现了较高的检测信噪比及分辨率.
    Abstract: For ultrasonic TOFD test of weld specimen with large thickness, conventional excitation is difficult to satisfy the requirements of SNR(signal to noise ratio), detection distance and resolution. LFM(linear frequency modulation) pulse compression technique is applied to ultrasonic TOFD test in this paper. LFM excitation can improve both SNR and resolution. Firstly, appropriate pulse width and bandwidth for 10 MHz transducer were determined by LFM parameter test. Then, a slot defect hided in the depth of 3 mm in steel plate was tested by ultrasonic LFM-TOFD test and conventional ultrasonic TOFD test. The results show that LFM excitation can make diffracted waves separated obviously, and the precision reaches up to 0.01μs, compared with conventional excitation. In the case of lower exciting voltage and gain, higher SNR and resolution can be achieved.
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    • 参考文献(9)
  • [1] 迟大钊,刚铁,姚英学,等.一种基于超声TOFD法的近表面缺陷检测模式[J].焊接学报, 2011, 33(2):25-28. Chi Dazhao, Gang Tie, Yao Yingxue. Mode for near surface defect detection based on ultrasonic TOFD[J]. Transactions of the China Welding Institution, 2011, 33(2):25-28.
    [2] Praveen K V S T A. Signal quality enhancement using higher order wavelets for ultrasonic TOFD signals from austenitic stainless steel welds[J]. Ultrasonics, 2013, 53(6):1288-1292.
    [3] Cong S, Gang T, Zhang J Y.Parameter design of linear frequency modulated excitation waveform for ultrasonic nondestructive testing of metallic materials[J]. Journal of Nondestructive Evaluation, 2014, 33(4):684-693.
    [4] Gran F, Jensen J A. Designing waveforms for temporal encoding using a frequency sampling method[J]. Ultrasonics, Ferroelectrics and Frequency Control, IEEE, 2007, 54(10):2070-2081.
    [5] Gang T,Sheng Z Y, Tian W L. Time resolution improvement of ultrasonic TOFD testing by pulse compression technique[J]. Insight, 2012, 54(4):193-197.
    [6] 陈敏,徐志胜.超声脉冲压缩法检测混凝土损伤的研究[J].中国安全科学学报, 2009, 19(11):101-104. Chen Min, Xu Zhisheng. Study on damage detection of concrete based on ultrasonic pulse compression method[J]. China Safety Science Journal, 2009, 19(11):101-104.
    [7] 白玉海,裴力伟,萧季驹.超声无损检测中的数字匹配滤波技术[J].声学学报, 1993, 18(2):111-118. Bai Yuhai, Pei Liwei, Xiao Jiju. Digital matched filter technique in ultrasonic non-destructive test[J]. Acta Acoustica, 1993,18(2):111-118.
    [8] Jeong J S, Chang J H, Shung K K. Pulse compression technique for simultaneous HIFU surgery and ultrasonic imaging:A preliminary study[J]. Ultrasonics, 2012, 52(6):730-739.
    [9] 周正干,魏东,向上.线性调频脉冲压缩方法在空气耦合超声检测中的应用研究[J].机械工程学报, 2010, 46(18):24-28. Zhou Zhenggan, Wei Dong, Xiang Shang. Application of linear-frequency-modulation based pulse compression in air-coupled ultrasonic testing[J]. Journal of Mechanical Engineering, 2010, 46(18):24-28.
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出版历程
  • 收稿日期:  2014-05-19

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