Design of Temperature Control System for High Precision Infrared Thermal Imager Based on ADRC
In order to control the temperature of infrared thermal imagers more accurately,a high-precision infrared thermal ima-ger temperature control system based on active disturbance rejection control(ADRC)is designed.The temperature control system is composed of system power supply module,detector driver module,analog-to-digital conversion module,line of sight estimation mod-ule,video signal processing module,external storage module,Ethernet transmission module,and temperature control module.The ADRC is used to design a single axis controller,the uncertainty caused by time delay is taken as a part of the system comprehensive disturbance.The expanded state observer and total disturbance are estimated,and are compensated in the feedforward channel to e-liminate the impact of time delay on the controller.The controller is applied to the temperature control of infrared thermal imagers and obtain high-precision temperature control results.Through experimental analysis,the results show that the frame rate,response band,startup time,power supply range,and power consumption of the designed system are 55 Hz,11 μm,3.4 s,12 VDC,and 0.56 W,respectively.It has a good temperature control performance of infrared thermal imagers,and can meet the requirements of extracting high-quality infrared images.
ADRChigh precisioninfrared thermal imagertemperature control system
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