TAILIEUCHUNG - Advances in measurement systems_2

Tham khảo sách 'advances in measurement systems_2', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 10 Sensors Characterization and Control of Measurement Systems Based on Thermoresistive Sensors via Feedback Linearization M. A. Moreira 1 A. Oliveira2 . Dórea2 . Barros 3 and . da Rocha Neto3 1 Universidade Estadual de Campinas 2 Universidade Federal da Bahia 3 Universidade Federal de Campina Grande Brazil 1. Introduction In this work the application of feedback linearization to characterize thermoresistive sensors and in feedback measurement systems which uses this kind of sensors is presented. Thermoresistive sensors in the general sense are resistive sensors which work based on the variation of an electrical quantity resistance voltage or current as a function of a thermal quantity temperature thermal radiation or thermal conductance . An important application of thermoresistive sensors is in temperature measurement used in different areas such as meteorology medicine and motoring with different objectives such as temperature monitoring indication control and compensation Pallas-Areny Webster 2001 Doebelin 2004 Deep et al. 1992 . Temperature measurement is based upon the variation of electrical resistance. In this case heating by thermal radiation or self-heating by Joule effect may be null or very small so that the sensor temperature can be considered almost equal to the temperature one wants to measure contact surface temperature surround temperature the temperature of a liquid etc. . A successful method for measurement using thermoresistive sensor uses feedback control to keep the sensor temperature constant Sarma 1993 Lomas 1986 . Then the value of the measurand is obtained from the variation of the control signal. This method inherits the advantages of feedback control systems such as low sensitivity to changes in the system parameters Palma et al. 2003 . A phenomenological dynamic mathematical model for thermistors can be obtained through the application of energy balance principle. In such a model the relationship between the 258 Advances in .

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