An Automated System of Lowered Temperature Setting for Long-Term Radiation Experiments

A description of the system for setting a lowered environment temperature based on Peltier modules is presented. The development was carried out taking into account the peculiarities of the radiation test: minimum distance from exposure source to DUT; stand-alone use during long-term radiation test; minimum overall dimensions, transportability and flexibility when conducting tests on various exposure sources. Cooling box consists of 3-level stacked assembly of the Peltier modules, which is cooled by liquid refrigerant. Control of the assembly of Peltier modules was performed according to proportional integral and differential algorithm, provided by microcontroller with feedbacks on Pt thermoresistors. The system provides temperature stabilization of the DUT up to 23×17×12 mm in size and with released heat power up to 0.4 W at minus (60 ± 3) °C. Temperature establishing time is less than 10 minutes. Typical power consumption of developed system is about 500W.