bullet Sensors & Transducers Journal

    (ISSN 1726- 5479)

205.767

2008 e-Impact Factor

25 Top Downloaded Articles

Journal Subscription 2012

Editorial Calendar 2012

Submit an Article

Editorial Board

Current Issue

Sensors & Transducers journal's cover

Sensors & Transducers Journal 2011

Sensors & Transducers Journal 2010

Sensors & Transducers Journal 2009

Sensors & Transducers Journal 2008

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 2011

 

 

 

Vol. 139, No. 4, April 2012, pp. 141-151

 

Bullet

 

Modification of the Wheatstone-Bridge for Measurement of a Process Variable by a Resistive Transducer Using LabVIEW

 

1 Narayana K. V. L  and 2 Bhujanga Rao A.

1 Department of Electronics and Instrumentation Engineering, GITAM Institute of Technology, GITAM University, Visakhapatnam- 530 045, India

2 Department of Instrument Technology, Andhra University, Visakhapatnam -530 003, India.

E-mail: kvl007in@yahoo.co.in, dr_abrao@yahoo.co.in

 

 

Received: 3 March 2012   /Accepted: 23 April 2012   /Published: 30 April 2012

 

Digital Sensors and Sensor Sysstems

 

Abstract: The small resistance of a resistive transducer generally linearly changes with a process variable, but their measurement by the usual resistive bridge circuit like the Classical Wheatstone-bridge suffers from errors due to the nonlinearity, contact resistances, effect of the shunt resistance between bridge nodal points and the lumped resistances of leads connected to sensor as well as detector.

 

In this paper, virtual instrument system for the measurement of small displacement using modified operational-amplifier-based dc Wheatstone bridge circuit with strain gauge as sensor has been proposed in which the effect of nonlinearity error and lead resistance is minimized. In this instrument, sensitivity and linearity have been improved in the absence of instrumentation amplifier. The output signal has been found to be linearly related with the displacement. This output voltage has been filtered and interfaced to PC-LabVIEW through NI-cDAQ. The proposed system is easy to implement and convenient for various applications. In the first phase of the experiment, the bridge performance has been simulated using Lab VIEW and studied with a known variable resistor, and in the second phase, the same experimentation was done by replacing the strain gauge for the measurement of displacement. The linear characteristics over a wide range of displacement with good repeatability, linearity, improved and variable sensitivity have been described.

 

Keywords: Wheatstone-Bridge, Strain gauge, LabVIEW, Displacement Measurement, Linearization, Sensitivity, Sensors

 

 

Buy this article online or subscribe Sensors & Transducers journal (12 issues per year plus special issues; 40 % discount for payment IFSA Members):

 

 

Sensors & Transducers journal subscription

450 $ US per year:

 

Buy this review article for
14.95 $ US:

 

 
 

 

 
 

Alternatively we accept a money transfer to our bank account. Please contact for details: sales@sensorsportal.com

 

Download <here> the Library Journal Recommendation Form

 

 

 

 

 


1999 - 2012 Copyright , International Frequency Sensor Association (IFSA). All Rights Reserved.


Home - News - Links - Archives - Tools - Voltage-to-Frequency Converters - Standardization - Patents - Marketplace - Projects - Wish List - e-Shop - Sensor Jobs - Membership - Videos - Publishing - Site Map - Subscribe - Search

 Members Area -Sensors Portal -Training Courses - S&T Digest - For advertisers - Bookstore - Forums - Polls - Submit Press Release - Submit White Paper - Testimonies - Twitter - Facebook - LinkedIn