Abstract
This paper presents a Mobile Hall Sensor Array system for the shape detection of ferromagnetic materials that are embedded in walls or floors. The operation of the Mobile Hall Sensor Array system is based on the principle of magnetic flux leakage to describe the shape of the ferromagnetic material. Two permanent magnets are used to generate the magnetic flux flow. The distribution of magnetic flux is perturbed as the ferromagnetic material is brought near the permanent magnets and the changes in magnetic flux distribution are detected by the 1-D array of the Hall sensor array setup. The process for magnetic imaging of the magnetic flux distribution is done by a signal processing unit before it displays the real time images using a netbook. A signal processing application software is developed for the 1-D Hall sensor array signal acquisition and processing to construct a 2-D array matrix. The processed 1-D Hall sensor array signals are later used to construct the magnetic image of ferromagnetic material based on the voltage signal and the magnetic flux distribution. The experimental results illustrate how the shape of specimens such as square, round and triangle shapes is determined through magnetic images based on the voltage signal and magnetic flux distribution of the specimen. In addition, the magnetic images of actual ferromagnetic objects are also illustrated to prove the functionality of Mobile Hall Sensor Array system for actual shape detection. The results prove that the Mobile Hall Sensor Array system is able to perform magnetic imaging in identifying various ferromagnetic materials.
Highlights
This paper presents the development of a Mobile Hall Sensor Array (MHS) system for the detection of the shapes of ferromagnetic materials using a Non Destructive Evaluation (NDE) technique
The development of a Mobile Hall Sensor Array for ferromagnetic material shape detection using the non-destructive evaluation concept was presented in this paper
This Mobile Hall Sensor Array system consists of a motorized structure, sensor and signal processing unit
Summary
Norhisam Misron *, Ng Wei Shin, Suhaidi Shafie, Mohd Hamiruce Marhaban and Nashiren Farzilah Mailah. Received: 5 September 2011; in revised form: 14 October 2011 / Accepted: 1 November 2011 /
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have