The thickness of aviation materials, including coating thickness, is an important process parameter, which plays an important role in product quality, process control, and cost control. In this paper, a theoretical model of the time-of-flight (TOF) of the coating reflection signal is established by using the terahertz time-domain spectroscopy system, and the method of measuring the thickness of the coating by using the TOF is proposed. The measurement error of the coating sample is less than 5% according to the refractive index information of the coating sample, which has important application value in aerospace coating inspection.
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Guofang et al. (2024) studied this question.
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