Unconventional Double-Current Circuit for Deflection and Temperature Simultaneous Measurement

Abstract

In this paper some interesting and novel features of a four-terminal (4T) network are presented. A single DC current source (J) is switched over and connected in turns to opposite arms of the four-element bridge circuit. This twooutput circuit with two voltage outputs is called a double current circuit (2x1J). The output voltages are differently dependent on the arm resistance increments and their values are given in absolute and relative units. An original application with two sensors acting as strain gauges and RTD's is presented. Signal conditioning formulas of 2D measurement of deflection and temperature of a cantilever beam are discussed in detail. Some results achieved with the use of the circuit are presented, as well.

The Calibration Process and Metrological Analysis of a Transducer Used to Measure Two Physical Quantities

“…The results are given in Tab In the case of the k2 coefficient it can be assumed that the X value, for which the calibration is carried out, is not important (the change in this case is only 0.05%). The following fixed values were assumed in order to conduct the calculations: ad=0.00832 mm -1 [2], W=100, α=0.00004 °C -1 , R0=121.116 Ω.…”

“…The output voltages of this direct current bridge are functions of differences and sums of the resistance increases of two foil strain gauges attached to a cantilever beam. Such circuit can be an alternative for system solutions in the case when deflection and temperature need to be recorded in the same point of the measured element (Idzkowski et al, 2015;Cappa et al, 2001;Paker, 1993). Also other solutions can be treated as differential measurement circuits, e.g.…”

Analysis and application of two-current-source circuit as a signal conditioner for resistive sensors

“…The graphs of relative non-linearity coefficients (12), (13) are presented in Figs. 2-5 (for J = 100 mA and R 0 = 100 Ω).…”

“…In order to test its metrological qualities, an attempt to physically realize the idea was taken. It was done through modifying the way of supply by introducing one, switchable current source [13].…”

Calibration procedure and uncertainty analysis of an electronic scale based on two-current source supplied circuit

“…The other one has an unconventional supplying: the 4T circuit is supplied by two equal current sources J connected to opposite arms -2J which is realized by switching over two equal sources between these arms -2×2J. In some cases only one current supply can be used -2×1J [4].…”