Sizing vertical cracks using burst vibrothermography. (December 2016)

• Record Type: Journal Article
• Authors: Mendioroz, A.; Celorrio, R.; Cifuentes, A.; Zatón, L.; Salazar, A.
• Is Part Of: NDT & E international. Volume 84(2016)
• Page Start: 36
• Page End: 46
• Publication Date: 2016-12
• Subjects: Vibrothermography -- Ultrasonic thermography -- Nondestructive evaluation -- Infrared thermography -- Cracks detection -- Inverse problems; Nondestructive testing -- Periodicals; Contrôle non destructif -- Périodiques; Electronic journals; 620.1127
• DOI: 10.1016/j.ndteint.2016.07.006
• Languages: English
• ISSNs: 0963-8695

Abstract

Abstract: We apply burst vibrothermography to characterize (area and depth) vertical cracks in a fast way. We present the calculation of the evolution of the surface temperature distribution produced by a vertical crack excited by an ultrasound burst. We develop a stabilized inversion algorithm that is able to retrieve the area and depth of the crack from one thermogram and one timing-graph. We check its performance by inverting both, synthetic data and experimental data taken on samples containing calibrated heat sources. Depth limits are established for accurate reconstructions of the defects as a function of the noise in the data. Highlights: A fast method to size vertical cracks from burst vibrothermography is presented. Only one thermogram and one timing-graph are used to characterize the crack. The maximum depths of retrievable cracks is analyzed as a function of noise. We characterize calibrated vertical cracks down to 6 mm from experimental data.