Static Field Magnetic Flux Thickness Gauge

Abstract

Non-destructive testing of coating thickness has long been standard practice. Depending on material and geometric properties of base and coating, different measurement methods are applied. The article presents a simple device to measure coating thickness working on a principle of static field magnetic flux gauge. The device has been tested in the range of (2–6000) μm, which is between the usual range of typical thickness gauges operating on ultrasonic or eddy-currents principles. Measurement results are shown. The expanded uncertainty of thickness measurement (k = 2) does not exceed 5% in the range of (2–4) mm. Construction of a working test stand constitutes the first step in further study on possible solutions of reducing the measurement uncertainty.