Thickness gauges can be roughly divided into:
1, contact thickness gauge
Contact area size division:
Point contact thickness gauge
Thickness gauge
2, non-contact thickness gauge
Non-contact thickness gauges can be divided into the following according to their different test principles:
Laser thickness gauge
Ultrasonic thickness gauge
Coating Thickness Gauge
X-ray thickness gauge
White light interference thickness gauge
Electrolytic thickness gauge
The testing methods of the thickness gauge are mainly: magnetic thickness measurement method, radiation thickness measurement method, electrolytic thickness measurement method, eddy current thickness measurement method, and ultrasonic thickness measurement method.
Measurement considerations:
1. When carrying out the test, it should be noted that the metal magnetic and surface roughness of the standard piece collective should be similar to the test piece.
2. When measuring, the side head is perpendicular to the surface of the sample.
3. Pay attention to the critical thickness of the base metal when measuring. If it is larger than this thickness, it will not be affected by the thickness of the base metal.
4. Pay attention to the influence of the curvature of the test piece on the measurement. Therefore, it is not reliable when measuring on the surface of a curved test piece.
5. Before measuring, please pay attention to whether other electrical equipment around will generate magnetic field, if it will interfere with the magnetic thickness measurement method.
6. When measuring, be careful not to measure at the inner corner and near the edge of the test piece, because the sudden change of the surface shape of the general thickness gauge specimen is very sensitive.
7. Keep the pressure constant during the measurement, otherwise it will affect the measured reading.
8. When testing, pay attention to the direct contact between the instrument probe and the tested component, so the ultrasonic thickness gauge removes the attached material from the opposite side.
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