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Study of inspection on metal sheet with subsurface defects using linear frequency modulated ultrasound excitation thermal-wave imaging (LFM-UTWI)
Institution:1. School of Mechanical Engineering, Heilongjiang University of Science and Technology, Harbin 150022, PR China;2. School of Electrical Engineering and Automation, Harbin Institute of Technology, Harbin 150001, PR China;3. College of Light Industry, Harbin University of Commerce, Harbin 150028, PR China;1. Mechanics of Materials and Structures (UGent-MMS), Department of Materials, Textiles and Chemical Engineering, Ghent University, Technologiepark-Zwijnaarde 46, 9052 Zwijnaarde, Belgium;2. SIM Program M3 DETECT-IV, Technologiepark-Zwijnaarde 48, B-9052 Zwijnaarde, Belgium;1. Departamento de Física Aplicada I, Escuela de Ingeniería de Bilbao, Universidad del País Vasco UPV/EHU, Plaza Ingeniero Torres Quevedo 1, 48013, Bilbao, Spain;2. Instituto Politécnico Nacional (IPN), Centro de Investigación en Ciencia Aplicada y Tecnología Avanzada (CICATA), Unidad Legaria, Legaria 694, Col. Irrigación, C.P. 11500, Ciudad de México, Mexico;3. Departamento de Matemática Aplicada, EINA/IUMA, Universidad de Zaragoza, Campus Río Ebro, Edificio Torres Quevedo, 50018, Zaragoza, Spain;1. National Key Lab for Remanufacturing, Army Academy of Armored Forces, Beijing 100072, People’s Republic of China;2. Department of Automotive Engineering, Army Academy of Armored Forces, Beijing 100072, People’s Republic of China;1. Universiti Kebangsaan Malaysia, 43600, Bangi, Selangor, Malaysia;2. Malaysian NuclearAgency, 43000, Kajang, Selangor, Malaysia;3. National Research Tomsk Polytechnic University, 7, Savinykh St. Tomsk, 634028, Russia
Abstract:The linear frequency modulated ultrasound excitation thermal wave imaging (LFM-UTWI) was investigated on detection of subsurface defects of metal sheet. A numerical finite element analysis is carried out to calculate thermal wave signal dependence of time by linear frequency modulated ultrasonic wave excitation. Cross-correlation operation in time domain and frequency domain are used to extract the main peak value and the corresponding delay time, respectively. Fourier transform (FT) is applied to calculate the amplitude and phase angle of harmonic component of thermal wave. Experimental results show that various deep subsurface defects are readily detected using LFM-UTWI with once excitation, and LFM-UTWI has an advantage of better defect detectability compared to ultrasound lock-in thermography (ULIT).
Keywords:Ultrasound excitation  Thermal-wave imaging  Linear frequency modulation  Lock-in thermography
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