ПРЕЦИЗИОННАЯ ЛАБОРАТОРНАЯ ПЕЧЬ ДЛЯ ПОЛУЧЕНИЯ НАНОЧАСТИЦ С СИСТЕМОЙ ПРОГРАММНОГО УПРАВЛЕНИЯ И ОБЛАЧНЫМ МОНИТОРИНГОМ

Abstract

Introduction: The development of a precision reaction furnace with a microprocessor control system based on an IoT class ESP-8266 microcontroller and a K-type thermocouple is presented. The temperature in the furnace hearth is maintained in the range from 50 to 350 °C with an accuracy of 1%. The temperature compensation of the cold junction of the thermocouple is provided. To improve the contro-accuracy and adjust the controller parameters, a reference mathematical model is used. Methods: a procedure for identifying the parameters of the reference model using the least squares has been developed. Regulator settings eliminate the occurrence of overshoot or fluctuations in the transient. A mode for monitoring the temperature and current power of the heater with visualization and logging of telemetry data to the cloud service (Telegram bot) has been implemented. Results: a mobile application implemented on a smart phone allows you to remotely receive temperature data and control the operating modes of the furnace. The duration of the experiment is actually not limited, the continuous operation of the furnace was tested on an interval of 24 hours. For high temperatures, in order to preserve the crucible, a mode of automatic stepwise heating and cooling is implemented. The furnace allows chemical reactions to be carried out at high temperatures in stabilization or program control modes, including decomposition reactions or the synthesis of nanoparticles from copper and other metals.