Magnetic induction method is a widely used coating thickness inspection method. This method utilizes the principle of electromagnetic field induction to make non-destructive measurements of coatings. In the magnetic induction method, a magnetometer, eddy current detector or Hall element is generally used for the measurement. This method is suitable for thicker coatings and is faster to detect, but
Introduction to Coating Thickness Inspection Methods
Author: Robby
First. Magnetic induction method
Magnetic induction method is a widely used coating thickness inspection method. This method utilizes the principle of electromagnetic field induction to make non-destructive measurements of coatings. In the magnetic induction method, a magnetometer, eddy current detector or Hall element is generally used for the measurement. This method is suitable for thicker coatings and is faster to detect, but the sensitivity of the magnetic induction detector needs to be calibrated.
Second, electromagnetic method
Electromagnetic method is also a non-destructive coating thickness detection method. Using the principle of electromagnetic field induction for measurement, it can be used for thinner coating measurement. There are two commonly used techniques for electromagnetic method: eddy current method and inductive coupling method. These techniques require the use of specialized instruments, including eddy current detectors or inductive coupling detectors.
Third, ultrasonic method
The ultrasonic method is a very common coating thickness detection method that can be applied to various types of coatings. Ultrasonic method utilizes the principle of ultrasonic wave propagation in the medium for measurement, which can measure the thinner coating and measure the parts that are not easy to contact. The method does not damage the coating and has high detection accuracy.
Fourth, X-ray method
X-ray method is a non-destructive testing method that can measure the thickness of any type of coating. The method requires the use of X-ray equipment for measurement, and can maintain the stability of the measurement results over a long period of time. However, since the method uses radiation, it requires special handling and protection measures.
V. Laser Scanning Method
The laser scanning method is a method suitable for measuring very thin coatings. The method utilizes the principle of laser for measurement and can obtain very accurate thickness measurement results. However, because the laser scanning method requires very high accuracy, the cost of the instrument is high.
In conclusion, there are many coating thickness inspection methods, each of which has its own scope of application and advantages and disadvantages. The type of coating, density and application area need to be considered when selecting a method in order to choose the appropriate method for measurement.