首页|On the variance propagation of thermistor-based measurements with a digital temperature controller
On the variance propagation of thermistor-based measurements with a digital temperature controller
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NSTL
Elsevier
? 2022 Elsevier LtdThermistor-based measurement systems at constant temperature have been widely used in multiple applications. In this type of hot-wire measurement applications, either analog circuits or digital processors can be used to regulate the thermistor temperature. The sampled-data control is an interesting alternative for temperature regulation because measurement signals are commonly handled by digital processors nowadays. However, the temperature control of Negative Temperature Coefficient (NTC) sensors present a nonlinear behavior in closed-loop operation. Furthermore, measurement variance depends on the temperature of the ambient and the dissipated power, but these relationships are nonlinear. This work proposes an approximated closed-loop propagation model for the output variance of an NTC-based measurement system at constant temperature. The thermistor temperature is regulated with a digital controller. Simulation and experimental results are presented in order to illustrate the benefits of the proposed model.
Digital controlMeasurement noiseNonlinear propagationNTC thermistorThermoresistive sensors
Santos V.C.V.、Santos T.L.M.
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Departamento de Engenharia Elétrica e de Computa??o Universidade Federal da Bahia Escola Politécnica
NSTL
Elsevier
