What is the difference between Magnetic Induction Film Thickness Gauge and eddy Current Film Thickness Gauge?

Magnetic induction Film Thickness Gauge and eddy current Film Thickness Gauge are instruments used to measure film thickness, and their working principles and measurement principles are different.

1. The magnetic induction film thickness meter measures the film thickness by measuring the magnetic field induction intensity, and it uses the relationship between the magnetic field induction intensity and the measured film thickness to measure. Usually in the magnetic induction film thickness meter, the film thickness is calculated by applying a magnetic field on the surface of the sample and then measuring the magnetic induction intensity.

The working principle of the magnetic induction film thickness meter:

The magnetic induction film thickness meter uses the relationship between the magnetic induction intensity and the thickness of the film to be measured. During the measurement process, a constant magnetic field is first applied on the sample surface, then a magnetic sensor is used to measure the magnetic field induction intensity, and finally the thickness of the measured film is calculated through the relationship between the magnetic induction intensity and the film thickness. This method is suitable for measuring magnetic materials with a thickness less than a few hundred microns.

2. The eddy current film thickness meter uses the principle of eddy current to measure the film thickness. When the alternating electromagnetic field passes through the surface of the conductor, a current will be generated on the surface of the conductor, which is called eddy current. The eddy current film thickness meter determines the thickness of the film by measuring the intensity of the eddy current, so as to realize the thickness measurement of the film.

The working principle of the eddy current film thickness meter:

The eddy current Film Thickness Gauge uses the principle of eddy current to measure the film thickness. When the alternating electromagnetic field passes through the surface of the conductor, a current will be generated on the surface of the conductor, which is called eddy current. In the eddy current film thickness meter, the eddy current intensity on the surface of the measured object is measured, and the thickness of the measured film is determined according to the eddy current intensity. Usually, in an eddy current film thickness meter, the object to be measured is placed in an alternating electromagnetic field, and then the thickness of the film to be measured is calculated by measuring the intensity of the eddy current. This method is suitable for measuring non-magnetic thin films and conductive thin films.

Therefore, the working principle and measurement principle of the magnetic induction film thickness meter and the eddy current film thickness meter are different, but they are all commonly used instruments for measuring film thickness. In practical applications, it is necessary to select a suitable instrument according to the specific application scenario and the nature of the object to be measured.