Temperature Monitoring System

Abstract

The multichannel temperature probe for studying the behavior of thermal fields is described in this article. As temperature sensors used Chromel - Alumel thermocouples. Thermoelectric each thermocouple (from 11mV to 13mV) increased its own amplifier to output voltage from 0 to 5 V corresponds to a temperature ranging from 0 to 50oC. The optimal solution for this case was the use of two-stage amplifier based on low-noise operational amplifiers. Data converting, data collection and data transfer to PC is based on ATMEGA16 microprocessor company Atmel. Signals from the amplifier module used for the analog inputs of microprocessor. The microprocessor receives the amplified analog signals from each thermocouple, converts them and transmits the data according to the protocol USART to the PC. USART pins are connected to the MAX232 and ADM 485 transceivers. The system operates in accordance with the software application that is based on data received from the COM port allows it to control the temperature of the object at certain points, as well as using mathematical interpolation procedure to determine the temperature at other points of a predetermined extended region. Multichannel temperature probe allows us to observe thermal fields in the temperature range 0 ° C … 50 ° C up to 0.1 ° C.