Coating thickness gauges generally have the following five types according to the measurement principle:
1. Magnetic thickness measurement method: It is applicable to the measurement of the thickness of the non-magnetic permeability layer on the magnetic conductive material. The magnetic conductive material is generally: steel\iron\silver\nickel. This method has high measurement accuracy.
2. Eddy current thickness measurement method: It is applicable to the measurement of the thickness of non-conductive layer on conductive metal. This method has lower precision than magnetic thickness measurement method.
3. Ultrasonic thickness measurement method: At present, this method has not been used to measure the thickness of the coating layer. Some foreign manufacturers have such an instrument, and the measurement of the thickness of the multi-layer coating layer is not the case where the above two methods cannot be measured. But the general price is expensive and the measurement accuracy is not high.
4. Electrolytic thickness measurement method: This method is different from the above three types. It does not belong to non-destructive testing and needs to destroy the coating layer. The general precision is not high. It is more troublesome to measure.
5. Radiation thickness measurement method: This kind of instrument is very expensive (generally above 100,000 RMB), suitable for some special occasions.
The most common method currently used in China is the first method.
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