Several Measurement Methods of Coating Thickness Gauge
Coating thickness gauge generally has the following five types according to the measurement principle:
1. Magnetic thickness measurement method: It is suitable for measuring the thickness of the non-magnetic layer on the magnetically conductive material. The magnetically conductive material is generally: steel\iron\silver\nickel. This method has high measurement accuracy
2. Eddy current thickness measurement method: It is suitable for measuring the thickness of non-conductive layer on conductive metal. This method is less accurate than magnetic thickness measurement method.
3. Ultrasonic thickness measurement method: At present, there is no such method in China to measure the thickness of the coating. Some foreign manufacturers have such instruments, which are suitable for the measurement of the thickness of multi-layer coatings or the occasions where the above two methods cannot be measured. But generally expensive \ measurement accuracy is not high.
4. Electrolytic thickness measurement method: This method is different from the above three methods. It does not belong to non-destructive testing and needs to destroy the coating. The general accuracy is not high. It is more troublesome to measure than other types.
5. Radiation thickness measurement: This kind of instrument is very expensive (generally above 100,000 RMB), and is suitable for some special occasions. The first and second methods are the most commonly used in China at present.
