Design of Remote Corrosion Detection System in the Marine Structure Using an Anisotropic Magnetic Resistance Sensor

Abstract

Corrosion in the ship can create severe damage to structures, such as a leak, crack and it leads to many maritime disasters (oil tankers) and it creates a lot of pollution, a problem for the environment and the inhabitants of the affected coasts. Hence, the detection and prevention of corrosion in a ship are very important to ensure safety. Many conventional methods like eddy current testing (ECT) are available as a non-destructive testing (NDT) scheme for analyzing defects in the metal sheets. However, these conventional methods are not suitable for analyzing objects build by using ferromagnetic materials due to permeability fluctuation. Hence, an efficient method is proposed to identify the corrosion in the ship structure by measuring the thickness of metal sheets periodically. The proposed system measures the thickness of metal sheet in the ship structure with the help of anisotropic magnetic resistance sensors. Also, the proposed system detects the corrosion in critical areas of ships without taking them out of the water. To avoid the influence of the liftoff, the proposed system measures the thickness of an object by using the phase spectrum instead of a magnetic spectrum curve. Furthermore, the proposed system effectively analyzes the corrosion of a metal sheet with less time and accuracy when the corrosion is more than 10%.