An accurately method for measuring resistive transducers from hydro-energetic constructions
Ioan Ciascai, Septimiu Sever Pop, Liviu Viman, Mircea Alexandru Dabacan · 2005
To ensure the hydro-energetic building reliability, specific quantities need to be monitored. The temperature, pressure, deformation, mechanical stress, etc. are often measured using resistive gauges, spread in the whole structure of the construction. The resistive transducers are based on the resistive variation and constructive are realized by one or two resistances in serial connection. To measure the resistive transducer can be used the consecrate method, Wheatstone bridge. To define the Wheatstone bridge is used one or two resistances from transducer, and other two is the reference resistor, located on the measurement system, which complete the circuit. Because the measurement is make different atmospheric condition (summer, winter), reference resistances are changing the value. For this cause using the reference resistor introduce the measurement errors. An embedded microcontroller system with a programmable analog to digital converter, which used only the transducer resistances, eliminates the error dependents by temperature and compensate the connection wires. The purpose of this article is a measurement method using a 16 bit sigma delta converter, which give the 0.001% precision for obtain values