The Principle of Digital Coating Thickness Gauge

Linshang Technology released a number of digital coating thickness gauges in 2019 with a digital display. A variety of measurements can be made with a single button press. The instrument currently supports three measurement modes: iron-based measurement, non-ferrous measurement and automatic measurement mode. In the automatic measurement mode, the measuring substrate can be automatically and automatically switched together, and the thickness of the coating on various metal substrates such as magnetic and non-magnetic materials can be measured.

Linshang digital dry film thickness gauge uses the Hall Effect and eddy current principles.

Hall Effect:The Hall Effect is the production of a voltage difference across an electrical conductor, transverse to an electric current in the conductor and to an applied magnetic field perpendicular to the current. The Hall coefficient is defined as the ratio of the induced electric field to the product of the current density and the applied magnetic field. It is a characteristic of the material from which the conductor is made, since its value depends on the type, number, and properties of the charge carriers that constitute the current.
Eddy Current: Eddy currents are loops of electrical current induced within conductors by a changing magnetic field in the conductor according to Faraday's law of induction. Eddy currents flow in closed loops within conductors, in planes perpendicular to the magnetic field.

They can be induced within nearby stationary conductors by a time-varying magnetic field created by an AC electromagnet or transformer, for example, or by relative motion between a magnet and a nearby conductor. The magnitude of the current in a given loop is proportional to the strength of the magnetic field, the area of the loop, and the rate of change of flux, and inversely proportional to the resistivity of the material.

Instruments that use these two measurement principles are different from a single iron-based coating thickness gauge or a non-ferrous coating thickness gauge. Such digital coating thickness gauges can test coating thicknesses on a variety of substrates.

Of course, the digital coating thickness gauge also has an ultra-short 0.5 s measurement interval, and multiple measurements do not have to wait. For more product information, please refer to "LS221 Digital Coating Thickness Gauge".