Paint film thickness measuring method based on terahertz pulse spectrum

Abstract

The invention relates to a paint film thickness measuring method based on terahertz pulse spectrum. The paint film thickness measuring method is characterized in that a paint film thickness measuring model can be established; a terahertz time domain spectrum device is used to measure terahertz pulse spectrum of a sample to be measured, the surface of which is covered by paint; a delay time difference of a reflection peak can be acquired according to the terahertz pulse spectrum; and the paint film thickness of the sample to be measured can be calculated according to the established paint film thickness measuring model. The paint film thickness measuring method based on the terahertz pulse spectrum is advantageous in that the new method can be provided for the paint film thickness measurement; and after the non-contact detection of different measuring points, the single-layer and multi-layer paint film thickness and the distribution uniformity can be detected.

Description

Technical field [0001] The invention relates to the field of paint film thickness measurement, in particular to a paint film thickness measurement method based on terahertz pulse spectroscopy technology. Background technique [0002] In the coating production process of automobiles, ships, etc., the paint system generally includes a multi-layer structure including primer, middle coat, color paint, and varnish. The spraying process is relatively cumbersome, and the thickness of the paint film of each layer is the most important coating quality. The control factors of the product will directly affect the anti-corrosion, anti-corrosion, and aesthetic properties of the product. Improper film thickness will cause the coating to produce defects such as sagging, paint stains, and abrasion marks; the appearance quality indicators of the paint film (such as gloss, color difference, long wave, short wave and DOI, etc.) are obviously affected by the film thickness; the coating is painted T...

AI Technical Summary

Problems solved by technology

Although X-ray thickness measurement is a non-contact non-destructive thickness measurement technology, the device is expensive, the operation is complicated, the measurement range is small, and the user needs to take radiation protection measures

Now that we have entered the era of Industry 4.0, it is the future development trend to realize the online detection of paint film thickness. Most of the traditional coating thickness gauges are contact type, which cannot be used for online measurement, and cannot detect each layer of paint in a multi-layer structure. Therefore, a non-contact detection technology that can directly detect the thickness of each layer of paint film is needed

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