Measurement of Foil Bonded Strain Gauges with 3 Wire Quarter Bridge

Abstract

The change in resistance of the foil bonded strain gauge is small, resulting in a small change in the output from the sensor, so lead wire effects and electro-magnetic noise can compromise the measurement. To measure such small changes in resistance, this paper compared 3 Wire Quarter Bridge with 2 wire quarter bridge strain circuit, half bridge strain circuit and full bridge strain circuit, recommended using 3 wire quarter bridge to measure the resistance of foil bonded strain gauges. 3 wire quarter bridges are easier to install, reusable, have superior temperature compensation, and some are for dynamic monitoring.