The fully automatic coating thickness gauge is a key equipment for modern industrial quality inspection, and its core technology lies in adopting optimized measurement principles for different substrates and coatings. The dual-mode fusion of X-ray fluorescence (XRF) and eddy current technology is an advanced solution designed to maximize measurement range, accuracy, and efficiency. These two technologies have distinct principles and complementary advantages, together forming a powerful measurement system.

X-ray fluorescence (XRF) measurement principle:

XRF technology is a physical method based on atomic level excitation. The high-energy X-rays emitted by the instrument irradiate the surface of the sample, exciting the inner layer electrons of the atoms in the coating and substrate material. When the excited atom returns to stability, it will release secondary X-rays of specific energy (i.e. fluorescence). By detecting and analyzing the energy and intensity of these characteristic fluorescence, the elemental composition of the coating can be qualitatively analyzed without damage, and its thickness can be accurately quantified. The XRF method is capable of measuring coatings on various metal coatings (such as gold, silver, nickel, palladium, etc.) and non-metallic substrates (such as plastics, ceramics), and has a wide range of applications.

Principle of eddy current measurement:

Eddy current technology is an electromagnetic induction method. The coil inside the measuring head is fed with high-frequency alternating current, generating an alternating magnetic field. When the probe is close to a conductive metal substrate, eddy currents (eddy currents) are induced inside the substrate. This eddy current itself will generate an anti magnetic field in the opposite direction to the original magnetic field, thereby affecting the impedance of the coil. The presence of a coating can change the distance at which the magnetic field is transmitted to the substrate. Therefore, by accurately measuring the change in coil impedance, the thickness of a non-conductive coating (such as paint, anodized film) on a non-magnetic metal substrate (such as aluminum, copper) or the thickness of a non-magnetic coating on a non-magnetic substrate can be calculated.

Dual mode fusion and intelligent switching:

The essence of dual-mode fusion instruments lies in "intelligence". The device integrates two types of measuring heads, XRF and eddy current, and is controlled by advanced software systems. The operator only needs to input or have the device automatically recognize sample information (such as substrate type, coating type), and the system will automatically select the most suitable measurement technique based on the built-in expert knowledge base.

For example:

Measure the copper/nickel/gold coating on plastic, and the system automatically activates XRF mode.

Measure the anodized film on the aluminum material, and the system will automatically switch to eddy current mode.

This fusion greatly expands the versatility of the instrument, achieving "one machine for multiple uses". It eliminates the trouble of users choosing measurement technology, and on the fully automatic measurement platform, it can quickly and seamlessly detect parts of different materials and processes, significantly improving detection efficiency and reliability, and meeting the demanding requirements of quality control in complex modern manufacturing industry.