Unconventional double-current circuit – accuracy measures and application in two-parameter measurement

Zygmunt Warsza, Adam Idzkowski, Wojciech Walendziuk

Abstract

In this paper some interesting and novel features of a four-terminal (4T) network are presented. A single DC current source is switched over and connected in turns to opposite arms of the four-element bridge circuit. This two-voltage-output circuit is called a double current bridge. The output voltages are dependent on the arm resistance increments and their values are given in absolute and relative units. The accuracy measures (limited errors and standard uncertainties) of two transfer functions are presented. A simple application with two sensors acting as strain gauges and RTD’s is presented. The simplified signal conditioning formulas of two- parameter measurement of strain and temperature of a cantilever beam are discussed. Some results achieved with the use of the circuit are presented.

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IMEKO TC

TC10 - Measurement for Diagnostics, Optimization and Control

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