Simultaneous measurement of two parameters by double current supplied bridge

Abstract

A four-terminal (4T) bridge-circuit, with two voltage outputs is presented. This circuit, named as double current bridge is supplied by two equal current sources connected in parallel to opposite arms (2J) or by one such source switched between those arms (2x1J). Two output voltages from bridge diagonals as functions of arm resistance increments in absolute and in relative units are given. Also the example of this bridge application is proposed. Signal conditioning formulas of two-parameter measurement on the example of strain and temperature are discussed in detail. Some results obtained with the use of this bridge-circuit are briefly described