Volume 37 Issue 11
Nov.  2011
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Ma Shuohan, Ma Qishuang. Pulse phase thermography chirp Z transform[J]. Journal of Beijing University of Aeronautics and Astronautics, 2011, 37(11): 1435-1439,1445. (in Chinese)
Citation: Ma Shuohan, Ma Qishuang. Pulse phase thermography chirp Z transform[J]. Journal of Beijing University of Aeronautics and Astronautics, 2011, 37(11): 1435-1439,1445. (in Chinese)

Pulse phase thermography chirp Z transform

  • Received Date: 05 Nov 2010
  • Publish Date: 30 Nov 2011
  • In order to solve the problem of insufficient frequency resolution, occurring at the infrared detection data processing by the pulse phase thermography (PPT), a new frequency domain transform method was proposed. The fast Fourier transform (FFT) was utilized to choose the narrow frequency band included within the characteristic frequency, this band was processed by the chirp Z transform (CZT), the refined frequency structure was obtained. The clear amplitude and phase image sequences were reconstructed from the pixel-by-point analysis results. Without increasing the sampling time, a higher frequency resolution was achieve than the one of the PPT. Through the comparison of the detection signal from an aluminum material specimen, the results show that the algorithm can effectively refine the selected frequency band, get more precise characteristic frequency and effectively reduce the spectral leakage errors.

     

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  • [1] Omar M A,Zhou Y.A quantitative review of three flash thermography processing routines[J].Infrared Phys Techn,2008,51(4):300-306 [2] Hung M Y Y,Chen Y S,Siu P N,et al.Review and comparison of shearography and pulsed thermography for adhesive bond evaluation[J].Opt Eng,2007,46(5):51007-51016 [3] Galmiche F,Leclerc M,Maldague X.Time aliasing problem in pulsed phased thermography[C]//Rozlosnik A,Dinwiddie R.Thermosense XXⅢ.Orlando,FL:SPIE,2001:550-553 [4] Maldague X,Marinetti S.Pulse phase infrared thermography[J].Journal of Applied Physics,1996,79(5):2694-2698 [5] Ibarra-Castanedo C,Galmiche F,Darabi A,et al.Thermographic nondestructive evaluation:overview of recent progress[C]//Crametk,Maldague X.Proc SPIE Thermosense XXV.Florida:SPIE,2003:450-459 [6] 奥本海姆 A V,谢弗 R W.离散时间信号处理[M].西安:西安交通大学出版社,2001 Oppenheim A V,Schafer R W.Discrete-time signal processing[M].Xi-an:Xi-an JiaoTong University Press,2001(in Chinese) [7] Wu D,Salerno A,Schonbach B,et al.Phabe sensitive modulation thermography and its applications for NDE[C]//Wurzbach R,Burleigh D.Proc SPIE Thermosense XIX.Bellingham:SPIE,1997:176-182 [8] 陈祝明,丁义元,向敬成.采用Chirp-Z变换提高LFMCW雷达的测距精度[J].信号处理,2002,18(2):110-112 Chen Zhuming,Ding Yiyuan,Xiang Jingcheng.Improving range precision of LFMCW radar by chirp-Z transform [J].Signal Processing,2002,18(2):110-112 (in Chinese) [9] 郭惠勇,李正良.基于模态应变能与频率信息修正的结构多损伤识别研究[J].应用基础与工程科学学报,2008,16(5):719-725 Guo Huiyong,Li Zhengliang.An improved information method based on modal strain energy and frequency for structural multiple damage identification [J].Journal of Basic Science and Engineering,2008,16(5):719-725(in Chinese) [10] Babiner L,Schafer R,Rader C.The chirp Z-transform algorithm [J].Audio and Electmacoustics,IEEE Tmnsactions on,1969,17(2):86-92
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