Magnetic and Eddy Current Methods of Thickness Gauge Characteristics and Applications
The coating thickness gauge can non-destructively measure the thickness of non-magnetic coatings (such as aluminum, chromium, copper, enamel, rubber, paint, etc.) on magnetic metal substrates (such as steel, iron, alloy and hard magnetic steel, etc.)
The coating thickness gauge has the characteristics of small measurement error, high reliability, good stability, and easy operation. It is an indispensable testing instrument for controlling and ensuring product quality. It is widely used in manufacturing, metal processing, chemical industry, commodity inspection and other testing fields.
Different thickness gauges can be selected according to the needs of measurement. Magnetic thickness gauges and eddy current thickness gauges are generally suitable for measuring thicknesses of 0-5mm. These instruments are divided into probes and mainframes, and probes and hosts. The former is easy to operate, and the latter is suitable for measuring non-planar shapes. Thicker dense materials should be measured with an ultrasonic thickness gauge, and the measured thickness can reach 0.7-250 mm. The electrolytic thickness gauge is suitable for measuring the thickness of gold, silver and other metals plated on very thin wires.
The dual-purpose type combines the functions of a magnetic thickness gauge and an eddy current thickness gauge, and can be used to measure the thickness of coatings on ferrous and non-ferrous metal substrates.
Instrument Features:
1. The dual-function built-in probe is used to automatically identify iron-based or non-ferrous matrix materials, and select the corresponding measurement method for accurate measurement.
2. Ergonomically designed dual-display structure can read measurement data at any measurement position.
3. The menu-style function selection method of the mobile phone is adopted, and the operation is very simple.
4. The upper and lower limit values can be set. When the measurement result exceeds or meets the upper and lower limit values, the instrument will emit a corresponding sound or flashing light to prompt.
5. The stability is extremely high, and it can be used for a long time without calibration.
The measurement methods of coating thickness mainly include: wedge cutting method, optical section method, electrolysis method, thickness difference measurement method, weighing method, X-ray fluorescence method, β-ray backscattering method, capacitance method, magnetic measurement method and eddy current measurement method, etc. Among these methods, the first five are destructive testing, the measurement methods are cumbersome and slow, and most of them are suitable for sampling inspection.
With the advancement of technology, especially after the introduction of microcomputer technology in recent years, the thickness gauge using magnetic method and eddy current method has taken a step forward in the direction of miniature, intelligent, multi-functional, high-precision and practical. The measurement resolution has reached 0.1 microns, and the accuracy can reach 1%, which has been greatly improved. It has wide application range, wide measuring range, easy operation and low price, and is the most widely used thickness measuring instrument in industry and scientific research.
