Newer Technology for Coating Thickness Gauges
At present, both well-known brands and ordinary manufacturers at home and abroad require the following steps to operate their thickness gauges:
Zero adjustment, that is, zero adjustment on a specific zero plate or zero adjustment on the original substrate that needs to be measured;
According to the different measurement ranges of the measured products, adjust the values with appropriate test pieces to reduce measurement errors.
In general, this method is not a problem when the instrument is newly purchased and used, but it is a bit cumbersome.
But after using the probe for a period of time, the problem arises. Our instrument's measurement accuracy has greatly decreased during operation.
It's hard to grasp. The reason lies in the principle of the product, which is a fatal flaw that the probe uses a magnet wound around a coil.
After applying current, a magnetic field is generated, which is irregular.
Fortunately, there is now a new type of coating thickness gauge, the FT200 coating thickness gauge, which uses the latest magnetic sensing technology.
That is to say, the Hall effect, which was discovered by Hall in 1879. By studying the relationship between Hall voltage and operating current, measuring the magnetic field and permeability of the electromagnet, and studying the relationship between Hall voltage and magnetic field, Hall found that the potential difference U H is proportional to the current intensity I H, proportional to the magnetic induction intensity B, and inversely proportional to the thickness d of the thin sheet.
This magnetic field becomes regular. This principle can be applied to coating thickness gauges without the need to adjust the test piece. Especially when measuring products with circular arcs or concave surfaces, it is simpler and more convenient to use.
