There are roughly five measuring principles:
1. radiation thickness measurement method: the instruments using this method are expensive and generally only used in special occasions.
2. Eddy current thickness measurement method: it is suitable for measuring the thickness of non-conductive layer of conductive metal, but its accuracy is relatively low.
3. Magnetic thickness measurement method: it is suitable for measuring the thickness in the nonmagnetic layer of magnetic conductive materials. Generally used in iron, steel, silver and other materials. The measurement accuracy is relatively high.
4. Electrolytic thickness measurement method: This method is different from others, which needs to destroy the coating and has low accuracy. Compared with other thickness measurement methods, it is relatively complicated.
5. Ultrasonic thickness measurement method: it is suitable for measuring the thickness of objects with more coatings and thicker layers, but the magnetic thickness measurement method and eddy current thickness measurement method cannot measure the thickness. But the price is higher and the accuracy is not high.
There are various measuring methods of thickness gauge in the market, which can be roughly divided into the following two types: 1 and contact thickness gauge. 2. Non-contact thickness gauge. Contact type can be divided into surface contact thickness gauge and point contact thickness gauge according to contact area. Due to different principles, non-contact type can be divided into the following types: X-ray thickness gauge, electrolytic thickness gauge, coating thickness gauge, laser thickness gauge and ultrasonic thickness gauge.
Paper thickness gauge: suitable for measuring the thickness of various sheet materials below 4 mm.
Ultrasonic thickness gauge: The thickness is measured by the principle of ultrasonic pulse reflection, which can be used to measure all kinds of materials that can be propagated by ultrasonic waves at a uniform speed.
Laser thickness gauge: it is a non-contact thickness gauge, which uses the principle of laser reflection to measure the thickness of an object by measuring and observing the micro-geometry of the surface of a part. The laser thickness gauge can directly output signals and connect with the industrial computer, quickly process data and output deviation values. Laser thickness gauge adopts laser detection technology and protective measures, which is suitable for measuring the thickness of objects with high temperature. Its detection system has the advantages of low cost, no radiation and easy maintenance.
Different kinds of objects need different thickness gauges, so if you want to measure the thickness of objects, you must first allocate the materials of the objects.
I hope Bian Xiao's introduction will be helpful to all the audience.
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