Design Of Temperature Infrared Monitoring And Control System

Both the stirring speed and the length of mixing time will affect the changes anddistribution of the temperature in pharmaceutical process, which have an impact on thequality of pharmaceuticals. Pharmaceutical quality will reduce when the change oftemperature or the range of temperature is irrational. Therefore, based on infrared temperaturesensor, a temperature monitoring and control system was designed in the paper. To study theimpact of the mixing speed on the temperature changes and distribution of pharmaceuticals,real-time temperature monitoring of pharmaceuticals was achieved in mixing process. Thestudy provides base for controlling pharmaceutical temperature and improving pharmaceuticalquality.Firstly, the commonly used temperature detection methods and development status weresummarized, and the advantages and disadvantages of those methods were analyzed. Thencombined with the requirement of the actual monitoring object on the sensor parameters, thesensor was selected. The feasibility of temperature monitoring based on the infraredtemperature sensor was demonstrated and the system overall framework was given.The hardware of the system consists of three main functional modules, which aretemperature acquisition module, control and transmission module, and the motor module. Thetemperature acquisition modules use three sensors for temperature acquisition, and in datatransmission the three sensors share the same SPI bus by using time-division multiplexingmethod. Control and transmission module is the core of the hardware system, it’s achievedhardware interfaces with temperature acquisition module, hardware interfaces of motormodule and computer through C8051F340MCU and peripheral circuits. By means of softwareprogramming, communication function with the computer was achieved via the USB port,and data transmission in temperature acquisition module, motor module and computer wasachieved. The motor module consists of two-phase stepper motor and the matching driver.The function of controlling the mixing speed and direction was achieved by receiving thepulse and level signal from the control and transmission module.Master control software of the system was achieved by using C++ programming language and VC6.0 programming software. Based on the framework of the dialog box procedure, themain software part achieved the function of the real time displaying of temperatureinformation and motor status, setting method of motor control parameter and thecommunication with USB devices.With the system, temperature changes, temperature distribution and the relationshipbetween equilibrium temperature and stirring speed were studied. Finally, by analyzing therelationship between stirring speed and the equilibrium temperature in the test, a method todetermine the stirring speed was given in different target temperatures.At last, the conclusions of the full text were given, and complete recommendation on thelocal system was made.