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This work aims at developing a new excitation method for thermal wave nondestructive test(NDT)-Terahertz excitation. In the paper we introduce a theoretical model of heat conduction for periodical THz excitation. BWO (backward wave oscillator) terahertz source is employed to heat a carbon fiber plate with wave absorbing coating, surface temperature variations and distributions are captured by an infrared camera, and Canny edge algorithm is used to process thermal images to show the defects. Result of flash pulse thermography serves as comparison, and the advantages of THz thermal wave NDT are discussed. The combination of THz technology and infrared thermal wave NDT is realized.
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Keywords:
- thermal wave imaging /
- THz excitation /
- backward wave oscillator (BWO) /
- nondestructive testing
[1] Favro L D, Han X Y, Wang Y X 1995 QNDE 14A 425
[2] Pickering S, Almond D 2008 NDT & E International 41 501
[3] Gasparyan S H, Andrianopoulos N P 2005 Appl. Compos. Mater. 12 65
[4] Favro L D, Kuo P K, Thomas R L 1994 QNDE 13A 395
[5] Avdelidisa N P, Almond D P 2004 Prog. Aerosp. Sci. 40 143
[6] Favro L D, Han X Y, Ouyang Z 2001 Int. J. Fatigue 23 471
[7] Zenzingera G, Bamberga J, Satzgera W, Carlb V 2007 NDT & E International 22 101
[8] Zhang C L, Zhang Y, Zhao G Z 2008 Terahertz Sensing and Imaging (Beijing: National Defense Industry Press) p22 (in Chinese) [张存林, 张岩, 赵国忠 2008 太赫兹感测与成像(北京:国防工业出版社)第22页]
[9] Dobroiu A, Yamashita M, Ohshima N 2004 Appl. Opt. 43 5637
[10] Sheng J L, Zhang C L, Hu Y 2004 Acta Phys. Sin. 53 2212 (in Chinese) [沈京玲, 张存林, 胡颖 2004 53 2212]
[11] Chen M, Xiao T Q, Xu H J 2003 Acta Phys. Sin. 52 2807 (in Chinese) [陈敏, 肖体乔, 徐洪杰 2003 52 2807]
[12] Ge X H, Lv M, Zhong H, Zhang C L 2010 Infrared Millim. Waves 29 15 (in Chinese) [葛新浩, 吕默, 钟华, 张存林 2010 红外与毫米波学报 29 15]
[13] Meng T H, Zhao G Z, Zhang C L 2008 Acta Phys. Sin. 57 3846 (in Chinese) [孟田华, 赵国忠, 张存林 2008 57 3846]
[14] Zhang H J 1992 Heat Conduction (Beijing: Higher Education Press) p15 (in Chinese) [张洪济 1992 热传导(北京:高等教育出版社)第15页]
[15] Breitenstein O, Langenkamp M 2003 Lock-in Thermography (Germany: Springer) p24–30
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[1] Favro L D, Han X Y, Wang Y X 1995 QNDE 14A 425
[2] Pickering S, Almond D 2008 NDT & E International 41 501
[3] Gasparyan S H, Andrianopoulos N P 2005 Appl. Compos. Mater. 12 65
[4] Favro L D, Kuo P K, Thomas R L 1994 QNDE 13A 395
[5] Avdelidisa N P, Almond D P 2004 Prog. Aerosp. Sci. 40 143
[6] Favro L D, Han X Y, Ouyang Z 2001 Int. J. Fatigue 23 471
[7] Zenzingera G, Bamberga J, Satzgera W, Carlb V 2007 NDT & E International 22 101
[8] Zhang C L, Zhang Y, Zhao G Z 2008 Terahertz Sensing and Imaging (Beijing: National Defense Industry Press) p22 (in Chinese) [张存林, 张岩, 赵国忠 2008 太赫兹感测与成像(北京:国防工业出版社)第22页]
[9] Dobroiu A, Yamashita M, Ohshima N 2004 Appl. Opt. 43 5637
[10] Sheng J L, Zhang C L, Hu Y 2004 Acta Phys. Sin. 53 2212 (in Chinese) [沈京玲, 张存林, 胡颖 2004 53 2212]
[11] Chen M, Xiao T Q, Xu H J 2003 Acta Phys. Sin. 52 2807 (in Chinese) [陈敏, 肖体乔, 徐洪杰 2003 52 2807]
[12] Ge X H, Lv M, Zhong H, Zhang C L 2010 Infrared Millim. Waves 29 15 (in Chinese) [葛新浩, 吕默, 钟华, 张存林 2010 红外与毫米波学报 29 15]
[13] Meng T H, Zhao G Z, Zhang C L 2008 Acta Phys. Sin. 57 3846 (in Chinese) [孟田华, 赵国忠, 张存林 2008 57 3846]
[14] Zhang H J 1992 Heat Conduction (Beijing: Higher Education Press) p15 (in Chinese) [张洪济 1992 热传导(北京:高等教育出版社)第15页]
[15] Breitenstein O, Langenkamp M 2003 Lock-in Thermography (Germany: Springer) p24–30
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