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Recently,the use of fiber-reinforced polymers has become widely used in various industries. Carbon fiber reinforced polymers (CFRP) are commonly used in the aerospace, nuclear, renewable energy, architecture, and marine industries. The complexity of the manufacturing process of these parts is always associated with the formation of various types of manufacturing defects. The existence of non-homogeneous structures in these parts has faced several limitations using classical NDT methods in the inspection process. The active thermography method using infrared waves is today considered one of the proposed methods in the inspection of composites. In the present work, samples with flat sheet geometry and curve sheet geometry of carbon fiber-reinforced polymer were tested using a pulse technique. Several different types of defects with different dimensions were manually created in these parts, and inspection was performed using the thermography method. The results have shown that the use of radiant thermal stimulation with the transmission technique can reveal the samples' internal defects. The presence of different thermal conductivity of needle-shaped metal defects with0.2 mm diameter, foreign particles with2 mm diameter, and 10×10 mm2 delamination led to the appearance of these defects in flat and curved samples