Research On Temperature Control System For Laser Diode

Now,laser diode(LD) is extensively applied in science and research,national defense,industry fields etc.When LD is applied in some precise instruments,it produces the caloric which greatly influences the characteristics of LD (for example,with LD temperaturechanged,the wavelength of the LD output light drifts),and so influences the accuracy.In this circumstance,it is needed to strictly control the changes of LD temperature.The controlled object is the temperature of small or middle power LD.Platinum thermometer is used as temperature sensor.The thermoelectric cooler(TEC).which is free from pollution and a good cold result,is made as temperature control conduct device,an ARM7 (LPC2214) based temperature measurement and control system is designed. It not only is a low-cost system but can provide satisfying performance. The system is composed of three modules, i.e. temperature measurement module, micro-processor module, and temperature controller module. Firstly, the paper gives a review of temperature measurement and control, then makes a design about the system.A Fuzzy-PID algorithm is an algorithm that derivers from traditional PID algorithm. It has inherited the characteristics of a traditional PID algorithm. Furthermore, it is also a robust algorithm. Therefore, it will increase the performance of a temperature controller if a Fuzzy-PID algorithm is adopted. and gives a detail analysis of experiment data at last.Finally,someverification experiments have been performed using the whole temperature control system,and the emulate results show that the degree of temperature stablization is less than±0.05°C.