bullet Sensors & Transducers Journal

    (ISSN 1726- 5479)


2007 e-Impact Factor


25 Top Downloaded Articles

Journal Subscription 2008

Editorial Calendar 2008

Submit an Article

Editorial Board

Current Issue

Sensors & Transducers Journal's cover


Sensors & Transducers Journal 2007

2000-2002 S&T e-Digest Contents

2003 S&T e-Digest Contents

2004 S&T e-Digest Contents

2005 S&T e-Digest Contents

2006 S&T e-Digest Contents


Best Articles 2006




Vol. 87, Issue 1, January 2008, pp.31-38




Pharmaceutical Pill Counting and Inspection Using a Capacitive Sensor


Ganesan Letchumanan1, Simon Hawkins1, Peter Rockett1,

Steve Sheard1, Conrad Shail2, Kenneth Shail2, Peter Dobson3

1Department of Engineering Science, Oxford University, Parks Road, Oxford OX1 3PJ, UK

2Sparc Systems Ltd, Merebrook Industrial Estate, Hanley Road, Malvern, Worcs WR13 6NP, UK

3Oxford University Begbroke Science Park, Sandy Lane, Kidlington, Oxon OX5 1PF, UK

Tel.: +441865 273929, E-mail: steve.sheard@eng.ox.ac.uk



Received: 8 November 2007   /Accepted: 21 January 2008   /Published: 28 January 2008


Abstract: A capacitive sensor for high-speed counting and inspection of pharmaceutical products is proposed and evaluated. The sensor is based on a patented Electrostatic Field Sensor (EFS) device, previously developed by Sparc Systems Limited. However, the sensor head proposed in this work has a significantly different geometry and has been designed with a rectangular inspection aperture of 160mm 21mm, which best meets applications where a larger count throughput is required with a single sensor. Finite element modelling has been used to simulate the electrostatic fields generated within the sensor, and as a design tool for optimising the sensor head configuration. The actual and simulated performance of the sensor is compared and analysed in terms of the sensor performance at discriminating between damaged products or detection of miscount errors.


Keywords: Capacitive sensor, Pharmaceutical pill dispensing, Counting and checking, EFS


 Acrobat reader logo Click <here> or title of paper to download the full pages article (724 K)





1999 - 2008 Copyright , International Frequency Sensor Association (IFSA). All Rights Reserved.

Home - News - Links - Archives - Tools - Standardization - Patents - Marketplace - Projects - Wish List - Subscribe - Search - e-Shop - Membership

 Members Area -Sensors Portal -Training Courses - S&T Digest - For advertisers - Bookstore - Forums - Polls - Sensor Jobs - Site Map