Análise Sobre Difusão de Calor e Caracterização de um Sensor de Temperatura

Abstract

Considering the influence of temperature in several fields of science and how to obtain the data that determine the temperature in a certain place, it was thought to use a commercially available temperature sensor to establish the diffusion profile of heat around a source of heat, through some experimental tests. Thus, the objective of this work is to analyse the performance of the LM35 temperature sensor for Arduino architecture in real heat diffusion situations and after analyzing the data obtained experimentally with the data resulting from the analytical and numerical solutions of the heat equation. To do so, we first sought, through a bibliographical research, the mathematical model that determines the diffusion of heat, as well as the analytical and numerical solutions of this model. Four experimental tests were carried out, one of them aimed at determining the heat diffusion profile generated by the LM35 temperature sensor data, so that we could later compare these results with the data obtained through the analytical and numerical solutions of the diffusion equation of heat. With the data of the tests, it was also possible to obtain the characterization of the temperature sensor LM35 and its limitations. From the data generated it can be inferred that, the LM35 sensor has good usability in situations that do not occur abrupt changes of temperature due to its stabilization time. Another point observed with this work is that the analytical and numerical solutions of the heat equation tend to take a linear form over time, similar to the behavior of the LM35 sensor.