2021
DOI: 10.3390/app11209545
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Active Thermography for the Detection of Sub-Surface Defects on a Curved and Coated GFRP-Structure

Abstract: Initial defects, for example, those occurring during the production of a rotor blade, encourage early damages such as rain erosion at the leading edge of wind turbine rotor blades. To investigate the potential that initial defects have for early damage, long-pulse thermography as a non-destructive and contactless measurement technique is applied to a strongly curved and coated test specimen for the first time. This specimen is similar in structural size and design to a rotor blade leading edge and introduced w… Show more

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Cited by 13 publications
(4 citation statements)
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“…PT has been extensively applied to a variety of materials, such as CFRP [19] and glass fiber reinforced materials [24]. In [25], different active thermography methods, including pulsed thermography and lock-in thermography, are investigated for the inspection of spot welds.…”
Section: Related Work 21 Pulsed Thermography Technologymentioning
confidence: 99%
“…PT has been extensively applied to a variety of materials, such as CFRP [19] and glass fiber reinforced materials [24]. In [25], different active thermography methods, including pulsed thermography and lock-in thermography, are investigated for the inspection of spot welds.…”
Section: Related Work 21 Pulsed Thermography Technologymentioning
confidence: 99%
“…Further tailoring of the acquisition and sensor degradation models supports online calibration using a range of input variables (sensor temperature, ambient temperature, degradation indicators and others), i.e., enables robust shutter-less cameras. The proposed modeling approach can be combined with modern AI-based methods [ 23 ], e.g., object tracking task for infrared images [ 24 ] as well as to improve quality assurance and inspection applications such as infrared thermography [ 25 ], drones for the prevention of fire detection [ 26 ], material defect detection [ 27 ] and even wind turbine erosion detection [ 28 ] while incorporating physical models of different materials.…”
Section: Related Workmentioning
confidence: 99%
“…All output images were quantified and analyzed by calculating the carrier to noise ratio value of each detected defect. [ 10 ] He et al studied the basic theory of curved surface imaging and the fully automatic detection method for surface defects of “O”‐ring curved surfaces used in aerospace systems. First, the surface of “O”‐ring was divided into small pieces like small grids.…”
Section: Introductionmentioning
confidence: 99%