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Controlled temperature system for use in Ultrasound Laboratory experiments

Grant number: 14/16371-0
Support type:Scholarships in Brazil - Scientific Initiation
Effective date (Start): November 01, 2014
Effective date (End): August 31, 2015
Field of knowledge:Engineering - Electrical Engineering - Electrical, Magnetic and Electronic Measurements, Instrumentation
Principal researcher:Ricardo Tokio Higuti
Grantee:Caio César da Silva Gomes
Home Institution: Faculdade de Engenharia (FEIS). Universidade Estadual Paulista (UNESP). Campus de Ilha Solteira. Ilha Solteira , SP, Brazil

Abstract

This project has the objective to develop a temperature control system using Peltier effect cells, which will be used for ultrasound experiments that demand controlled temperature. A styrofoam box will be used as thermal recipient, where temperature sensors and Peltier cells will be installed. A signal conditioning circuit will be implemented, whose outputs are connected to the analog-digital conversion inputs of a microcontroller. By means of an automatic control algorithm and the establishment of a reference temperature, the microcontroller will generate a pulse width modulated (PWM) signal, which will be low-pass filtered and sent to a power stage that will activate the Peltier cells, this way closing the feedback loop and controlling the temperature inside the box. It is expected that the system control the temperature in the box within a variation of 0,2oC or better. This system will be part of a larger one, for temperature stabilization intended for characterization of liquids using ultrasound. (AU)

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