Abstract
The principle of operation, its practical realization and measurement research of a reconfigured system of a signal conditioner are presented. A two-sourced conditioner supplied by direct current with four resistance sensors and four switching keys was experimentally tested. In the example application the resistance of sensors in the function of the same point load, caused by perpendicular force, was measured. In order to compare the results achieved with the use of a conditioning circuit, similar tests were carried out for a four-channel Wheatstone’s bridge-based commercial acquisition card. The research aimed at confirming the possibility of implementing the constructed signal conditioner in cheap measurement equipment.DOI: http://dx.doi.org/10.5755/j01.eie.22.2.14587
Highlights
Known signal conditioners of resistance sensors are based on bridge systems [1] or Anderson’s current loop [2]
Two current sources of identical parameters were attached to the opposite nodes of the system, two additional reference resistors – to the other nodes
The reconfigurable conditioning circuit (2J + 2R + 4K) consists of resistance sensors connected into a bridge circuit, two precise reference resistors, two current sources and four switching keys which change the circuit way of operating
Summary
Known signal conditioners of resistance sensors are based on bridge systems [1] or Anderson’s current loop [2]. Systems built on the basis of a nonbalanced Wheatstone’s bridge, supplied by direct or alternating current sources, enable measuring only one input quantity, i.e. resistance change of e.g. a strain gauge or a resistance temperature detector (RTD). A circuit of this type enables measuring the change of resistance values of the sensors through appropriate records of the voltage drop on the opposite nodes of the bridge system Due to this phenomenon, with the help of appropriate mathematical formulas, it was possible to determine the two searched physical quantities (e.g. strain and temperature change) in the same point of the cantilever beam. The reconfigurable conditioning circuit (2J + 2R + 4K) consists of resistance sensors connected into a bridge circuit, two precise reference resistors, two current sources and four switching keys which change the circuit way of operating. It is worth stressing that the measurement process is carried out in a sequence of cycles controlled by the keys K1, K2, K3 and K4
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