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This document specifies a method for measuring the thickness of non-metallic coatings using time domain spectroscopy in the terahertz frequency range.
This method can be used for all coatings that are transparent to electromagnetic waves in the terahertz range, typically from around 10 μm depending on the material. The coatings can be deposited on both metallic and non-metallic base materials. The thickness of all individual layers of a layer stack can also be determined in a single measurement.
This method is also suitable if the layers to be tested are not applied to a substrate but are freestanding. Metallic or generally conductive layers cannot be penetrated by terahertz radiation, but act as a reflector, i.e. their thicknesses cannot be determined using this method.
Quality parameters such as the thickness and uniformity of non-metallic coatings are of great significance to product performance, service life, and safety. Traditional testing methods, like radiography and electromagnetic methods, have certain limitations. Radiography is harmful to the health of operators, while electromagnetic methods have insufficient resolution for multi-layer structures. Additionally, some methods are complex to operate and have low detection efficiency, making it difficult to meet the demands of modern industry for high-precision, non-contact, and rapid detection. At the same time, with the wide application of new materials and structures in fields such as power, aerospace, shipbuilding, automotive, and lithium batteries, the requirements for the accuracy and versatility of non-metallic coating testing technology are becoming increasingly stringent, and the existing technical system can no longer fully meet the needs of industrial development.
Globally, terahertz technology has shown great potential in the field of non-metallic coating detection due to its advantages such as high resolution, non-destructiveness, and good penetrability for nonmetallic materials. However, currently, there is a lack of a unified ISO international standard for terahertz detection technology. The detection methods of different countries and enterprises vary greatly, resulting in insufficient consistency and comparability of detection results, which seriously hinders the international promotion of the technology and industrial collaboration. In international trade, technical barriers and quality disputes caused by inconsistent detection standards occur frequently, increasing the compliance costs and trade risks of enterprises.
This document aims to specify the technical requirements, measurement methods, and evaluation of measurement results for terahertz detection of non-metallic coatings, ensuring the accuracy, repeatability, and comparability of detection results to meet the high-precision requirements of the industrial community for the quality control of non-metallic coatings. This standard is applicable to the terahertz detection of the thickness of various non-metallic coatings, covering all aspects of the industrial chain from research and development, production, to quality control.
The implementation of this standard will effectively promote the standardized and international application of terahertz detection technology in the field of non-metallic coatings, break down technical barriers, and promote the collaborative development of global industries. At the same time, it will provide enterprises with efficient, reliable, and diversified detection means, helping to improve product quality and ensure the safety and stability of downstream applications. It is an important measure to advance the high-quality development of the manufacturing industry and implement the global standardization strategy.
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