Coating thickness gauges have several major causes of measurement error
The coating thickness gauge uses new magnetic induction technology, which is the Hall effect. By studying the relationship between Hall voltage and working current, it measures the electromagnet magnetic field and magnetic permeability, and studies the relationship between Hall voltage and magnetic field. This magnetic field becomes regular. When this principle is applied to the coating thickness gauge, there is no need to adjust the test piece. Especially when measuring arc or concave products, it is easier and more convenient to use.
The coating thickness gauge uses electromagnetic induction to measure the thickness of the coating. The probe located on the surface of the component generates a closed magnetic loop. As the distance between the probe and the ferromagnetic material changes, the magnetic loop will change to varying degrees, causing changes in the magnetic resistance and probe coil inductance. This principle can be used to accurately measure the distance between the probe and the ferromagnetic material, that is, the coating thickness.
The coating thickness gauge does not need to be charged and discharged regularly for a long time to prevent the battery from locking up. For some small workpieces or workpieces with particularly thin coatings, it is recommended to use continuous measurement.
Several major reasons leading to measurement errors of coating thickness gauges:
1. The materials to be measured by the thickness gauge have different structures and shapes. On workpieces with different structures, the magnetic field distribution will vary with the structure and shape, resulting in measurement errors.
2. The material being tested itself contains magnetism. During the processing of some materials or certain process requirements, there is a residual magnetic field in the material being measured. Due to its uneven distribution, the resulting measurement errors are also inconsistent, and the measurement values of certain parts of the same workpiece suddenly become larger or smaller.
3. Different parts of the same material may also produce changes in the magnetic field. For example, the magnetic field distribution at the edge and middle area of the material is different, which may cause measurement errors.
4. Depending on the properties of the material being measured, the magnetic flux will be different, which is also one of the reasons for the error.
5. Different sizes and thicknesses of materials can also lead to measurement errors.
6. The surface of the material being tested is not smooth enough, which is also the cause of the error.
