Table of Contents Author Guidelines Submit a Manuscript
Journal of Sensors
Volume 2017 (2017), Article ID 1524782, 9 pages
https://doi.org/10.1155/2017/1524782
Research Article

Noise in Load Cell Signal in an Automatic Weighing System Based on a Belt Conveyor

Department of Information and Telecommunication Engineering, Incheon National University, Incheon 22012, Republic of Korea

Correspondence should be addressed to Kyoo Nam Choi

Received 23 April 2017; Revised 23 June 2017; Accepted 12 July 2017; Published 8 August 2017

Academic Editor: Stephane Evoy

Copyright © 2017 Kyoo Nam Choi. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Noise in load cell signal in an automatic weighing system based on a belt conveyor has been examined experimentally in time and frequency domains to enhance signal quality. The noise frequency spectrum showed nonlinearly increasing multiple resonance peaks as speed increased. The noise reduction process using noise reduction algorithm, by sharply rejecting peak noise frequency component and afterward forming optimum pulse width ratio through filter slope control using selective switching of 6 LPF stages, was used for enhanced accuracy. The effectiveness of proposed method, controlling both cutoff frequency and slope of LPF, was evaluated by feeding 50 g test mass, and this noise reduction process showed better noise filtering with enhanced accuracy than fixed cutoff frequency control method. The ratio of top to bottom pulse width showed that LPF cutoff frequency above 5 Hz had the ratio above 50% up to 80 m/min speed range.