PET polyester film, PET release film in today's microelectronic film, optical thin film and oxidation film, the giant magnetoresistance film, high temperature superconducting thin films, and other fields is finding wider and wider application.
Industrial application of PET polyester film, PET from type membrane, its thickness is a very important parameter, directly related to the film material can work normally.
Such as large scale integrated circuit in the process of production of a variety of thin film, circuit integration degree unceasing enhancement, any tiny change of film thickness on the performance of the integrated circuit will have direct impact.
In addition, PET polyester film, the mechanical properties of PET from type membrane, pervious to light performance, magnetic, thermal conductivity, surface structure and so on all has the close relation with the thickness.
In the film thickness method can accurately measure the urgent demand of, accordingly, has produced many scheme for measuring film thickness.
And among the numerous methods, optical method is the most widely used method.
It relative to other class method has the advantages of rapid, accurate and not damage film.
Throughout the numerous popular classification, according to the measuring method is based on the optical principle of classifying the most representative, can be divided into interference, diffraction and polarization transmission, reflection, etc.