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Vol. 136, Issue 1, January 2012, pp. 25-34




Modified AC Wheatstone Bridge Network for Accurate Measurement of Pressure
Using Strain Gauge Type Pressure Sensor


Subrata CHATTOPADHYAY, Mahuya BANERJEE and Sagarika PAL

Department of Electrical Engineering, National Institute of Technical Teachers’ Training and Research, Kolkata [Under MHRD, Govt. of India],

Block-FC, Sector-III, Salt Lake City, Kolkata-700 106, India

E-mail: subrata0507@sify.com, moujago@yahoo.com, spal922@yahoo.co.in


Received: 1 November 2011   /Accepted: 24 January 2012   /Published: 30 January 2012

Digital Sensors and Sensor Sysstems


Abstract: In order to achieve high quality of products at lesser cost, accurate measurement of different process variables is of vital importance in any industry. There are different well-established techniques of measurement and control instrumentations of these variables. In the resistive transducer like strain gauge, the small resistance generally changes linearly with a process variable like pressure but their measurement by usual AC Wheatstone bridge circuit may suffer from errors due to the effect of stray capacitance between bridge nodal points and ground and stray inductance on the strain gauge grid respectively. Though the conventional Wagner-Earth technique may be used to reduced the error but not suitable for continuous measurement. In the present paper, a modified operational amplifier based AC Wheatstone bridge measurement technique has been proposed in which the effect of stray capacitance and inductance is minimized. This bridge performance has been studied experimentally with the strain gauge type pressure transducer. The linear characteristics over a wide range of pressure with good repeatability, linearity and variable sensitivity have been described.


Keywords: Diaphragm, Strain gauge, AC Wheatstone Bridge, Pressure sensor


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