The Application Research of Amplitude Spectrum in the Coating Layer Thickness Detection

Abstract

The caoting layer of each industry structure detected by ultrasonic testing is one commonly used thickness detection technique. This article proposed a method which used the extreme value of resonant amplitude spectrum to extract the thickness feature value, it can solve the feature value extraction difficult question which caused by two situations of time domain signals aliasing when the coating layer thickness is quite small and signals weak when signal attenuates seriously. And when the extreme point distributed unevenly in the actual detection, some measurements to improve the feature value extraction precision are proposed, which increased the detection signal-to-noise rated effectively. Take the structure of steel shell bonding rubber coating layer as the detection object, the detection experiment is studied to confirm its validity.