Experimental study of inspection on a metal plate with defect using ultrasound lock-in thermographic technique

Liu, Junyan; Qin, Lei; Tang, Qingju; Wang, Yang

doi:10.1016/j.infrared.2012.03.009

Cited by 7 publications

(2 citation statements)

References 13 publications

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“…DWT is considered as a new technology to replace electrical noise attenuation processing using low-pass filter of Fast Fourier Transform (FFT) or lock-in amplifier system that can be used independently in environments with very low electrical noise [49]. The overlap of bands that are completely different or completely different from the signal and noise for which filtering methods can be utilized is an important characteristic of the moment of processing digital signals whose information does not change over time.…”

Section: Discrete Wavelet Transform (Dwt)mentioning

confidence: 99%

Latest Advances in Common Signal Processing of Pulsed Thermography for Enhanced Detectability: A Review

2021

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Non-destructive testing (NDT) is a broad group of testing and analysis techniques used in science and industry to evaluate the properties of a material, structure, or system for characteristic defects and discontinuities without causing damage. Recently, infrared thermography is one of the most promising technologies as it can inspect a large area quickly using a non-contact and non-destructive method. Moreover, thermography testing has proved to be a valuable approach for non-destructive testing and evaluation of structural stability of materials. Pulsed thermography is one of the active thermography technologies that utilizes external energy heating. However, due to the non-uniform heating, lateral heat diffusion, environmental noise, and limited parameters of the thermal imaging system, there are some difficulties in detecting and characterizing defects. In order to improve this limitation, various signal processing techniques have been developed through many previous studies. This review presents the latest advances and exhaustive summary of representative signal processing techniques used in pulsed thermography according to physical principles and thermal excitation sources. First, the basic concept of infrared thermography non-destructive testing is introduced. Next, the principle of conventional pulsed thermography and signal processing technologies for non-destructive testing are reviewed. Then, we review advances and recent advances in each signal processing. Finally, the latest research trends are reviewed.

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Section: Discrete Wavelet Transform (Dwt)mentioning

confidence: 99%

Latest Advances in Common Signal Processing of Pulsed Thermography for Enhanced Detectability: A Review

2021

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“…Many stimulation techniques have been developed in years with respect to active IrT. Ultrasound [25,26], cyclic loading [10,27], optical excitation (with incandescent or flash lamps) [25], or vibrations [9], are frequently employed as sources of thermal stimulation. Fundamental to a thermal stimulation protocol is the uniform excitation of the monitored surface for optimal detection of the An interesting approach to thermal stimulation is the exploitation of the conductive nature of CFRPs in order to use them as Joule heating elements.…”

Section: Current Injection Thermographymentioning

confidence: 99%

Current injection phase thermography for low-velocity impact damage identification in composite laminates

et al. 2014

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An innovative non-destructive evaluation (NDE) technique is presented based on current stimulated thermography. Modulated electric current is injected to Carbon Fibre Reinforced Plastics (CFRP) laminates as an external source of thermal excitation. Pulsed Phase Thermography (PPT) is concurrently employed to identify low velocity impact induced (LVI) damage. The efficiency of the proposed method is demonstrated for both plain and with Carbon Nanotubes (CNTs) modified laminates, which are subjected to low-velocity impact damaged composite laminates at different energy levels. The presence of the nano reinforcing phase is important in achieving a uniform current flow along the laminate, as it improves the through thickness conductivity. The acquired thermographs are compared with optical PPT, C-scan images and Computer Tomography (CT)representations. The typical energy input for successful damage identification with current injection is three to four orders of magnitude less compared to the energy required for optical PPT.

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Non-destructive testing of ceramic materials using mid-infrared ultrashort-pulse laser

Sun

et al. 2018

Appl. Phys. B

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Experimental study of inspection on a metal plate with defect using ultrasound lock-in thermographic technique

Cited by 7 publications

References 13 publications

Latest Advances in Common Signal Processing of Pulsed Thermography for Enhanced Detectability: A Review

Latest Advances in Common Signal Processing of Pulsed Thermography for Enhanced Detectability: A Review

Current injection phase thermography for low-velocity impact damage identification in composite laminates

Non-destructive testing of ceramic materials using mid-infrared ultrashort-pulse laser

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