White Opaque PET film is used more and more widely in various fields nowadays. The thickness of White Opaque PET film is a very important parameter, which is directly related to the normal work of the film material. Such as the large-scale integrated circuit in the production process of various films, the continuous improvement of the integrated circuit, and film thickness of any small changes in the performance of integrated circuits will have a direct impact. In addition, the mechanical properties, light transmittance, magnetic properties, thermal conductivity, and surface structure of White Opaque PET film are closely related to its thickness.

In response to the urgent need for accurate measurements of the thickness of the White Opaque PET film, a number of schemes have been developed to measure the film thickness. The thickness of the White Opaque PET film is usually measured using a Vernier scale tool in less demanding daily conditions, and optical methods are now used where high precision is required, compared with other methods, it has the advantages of rapidity, accuracy, and no damage to the film. The most popular classification methods are interference, diffraction, transmission, reflection, polarization, and so on, which are based on the optical principle.

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