Compensation of temperature errors in pressure piezoconverters

Abstract

Measuring pressure converters are one of the most popular control devices in technological processes. The most additional common error is temperature error. One of the causes of the additional temperature error is the uneven temperature field on the pressure converter measuring membrane surface that is determined by the nature of temperature impact. Constructive methods for reducing the stated error lie also in finding the topology of a resistance strain gage on the converter membrane that ensures minimum sensitivity to the uneven temperature field while retaining the pressure sensitivity. The effectiveness check of various topologies is hindered by different technical, technological and economic problems. The article proposes to run a check of topological solutions with the help of a mathematical model of the membrane temperature field that takes into account the temperature impact on the converter. The exponential function was chosen as a modelling function because it corresponded to the experimentally obtained temperature distribution data. This function allows virtually forming temperature field distributions on the membrane surface, characteristic of static, dynamic (thermal shock) and targeted temperature impact. This model will allow assessing without a physical experiment of additional temperature errors of various topological solutions. Additional temperature errors of the classic four resistance element topology and the topology proposed by the authors with component resistance strain gages are analysed as examples. The potential of topological solutions in minimization of additional temperature errors in pressure converters is shown. The approach set forth in the article streamlines the search for constructive solutions for minimizing additional temperature errors in pressure converters by reducing physical simulation stage.