When the principle of magnetic induction is employed, the thickness of the cladding is measured by the magnitude of the magnetic flux flowing from the probe through the non-ferromagnetic coating into the ferromagnetic substrate. It is also possible to measure the magnitude of the reluctance corresponding thereto to indicate the thickness of the coating. The thicker the coating, the larger the magnetic resistance and the smaller the magnetic flux. In the case of a thickness gauge using the principle of magnetic induction, in principle, the thickness of the non-magnetically permeable cladding on the magnetically permeable substrate can be obtained. The substrate is generally required to have a magnetic permeability of 500 or more. If the cladding material is also magnetic, the difference in magnetic permeability from the substrate is required to be sufficiently large (eg nickel plating on steel). When the probe around the coil on the soft core is placed on the sample to be tested, the instrument automatically outputs the test current or test signal. Early products used a pointer-type meter to measure the magnitude of the induced electromotive force, which was amplified by the instrument to indicate the thickness of the coating. The circuit design introduces new technologies such as frequency stabilization, phase lock, and temperature compensation, and uses magnetoresistance to modulate the measurement signal. It also uses a patented integrated circuit to introduce a microcomputer, which greatly improves measurement accuracy and reproducibility (almost an order of magnitude). The modern magnetic induction thickness gauge has a resolution of 0.1um, an allowable error of 1%, and a range of up to 10mm.
The magnetic principle thickness gauge can be applied to accurately measure the paint layer on the steel surface, porcelain, enamel protective layer, plastic, rubber coating, various non-ferrous metal plating layers including nickel-chromium, and various anti-corrosion coatings for chemical oil. Floor.
When the principle of magnetic induction is employed, the thickness of the cladding is measured by the magnitude of the magnetic flux flowing from the probe through the non-ferromagnetic coating into the ferromagnetic substrate. It is also possible to measure the magnitude of the reluctance corresponding thereto to indicate the thickness of the coating. The thicker the coating, the larger the magnetic resistance and the smaller the magnetic flux. In the case of a thickness gauge using the principle of magnetic induction, in principle, the thickness of the non-magnetically permeable cladding on the magnetically permeable substrate can be obtained. The substrate is generally required to have a magnetic permeability of 500 or more. If the cladding material is also magnetic, the difference in magnetic permeability from the substrate is required to be sufficiently large (eg nickel plating on steel). When the probe around the coil on the soft core is placed on the sample to be tested, the instrument automatically outputs the test current or test signal. Early products used a pointer-type meter to measure the magnitude of the induced electromotive force, which was amplified by the instrument to indicate the thickness of the coating. The circuit design introduces new technologies such as frequency stabilization, phase lock, and temperature compensation, and uses magnetoresistance to modulate the measurement signal. It also uses a patented integrated circuit to introduce a microcomputer, which greatly improves measurement accuracy and reproducibility (almost an order of magnitude). The modern magnetic induction thickness gauge has a resolution of 0.1um, an allowable error of 1%, and a range of up to 10mm.
The magnetic principle thickness gauge can be applied to accurately measure the paint layer on the steel surface, porcelain, enamel protective layer, plastic, rubber coating, various non-ferrous metal plating layers including nickel-chromium, and various anti-corrosion coatings for chemical oil. Floor.
