黑体辐射源广泛用于红外成像系统的校正, 在实际应用中要求黑体空腔在整个腔面区域上具有稳定、均匀的温度场, 为了提高控温精度, 本文设计了一种基于自抗扰控制的黑体辐射源温度控制系统。首先, 基于黑体辐射源的数学模型, 在 MATLAB/Simulink环境下进行 ADRC控制算法的仿真, 并与传统的 PID和 Smith预估计控制算法进行比较。仿真结果表明自抗扰控制算法具有响应快、精度高以及良好的设定值跟踪能力; 其次, 利用 LabVIEW软件的图形化编程实现了离散 ADRC的编程; 最后, 在 Compact RIO实时控制器中实现黑体辐射源的温度控制和实验数据的采集。实验结果表明, 此温控系统提高了黑体控温的精度, 温度稳定性优于 0.03℃/10 min, 并且该算法有着更强的自抗扰能力。自抗扰控制算法通过对系统状态与未知扰动进行实时的观测和有效的补偿, 提高了黑体辐射源的控温品质。

A blackbody radiation source is used in infrared image system calibration, which requires a stable and uniform temperature field over the large cavity surface area in practical applications. In order to achieve this and improve the precision of temperature control, a temperature control system is designed and implemented on the basis of active disturbance rejection control (ADRC). First, based on a mathematical model of blackbody radiation source, the ADRC control algorithm is executed in MATLAB/Simulink environment and compared with the traditional PID and Smith predictor control algorithm. The simulation results show that the proposed ADRC algorithm possesses the features of fast response, high precision and positive set point tracking. Then, graphical programming using LabVIEW software is performed for digital discretization of the ADRC algorithm. Finally, temperature control and experimental data acquisition of the blackbody radiation source are implemented using the Compact RIO real-time controller. The experiment results show that the temperature control system has improved the performance of the blackbody radiation source, providing a temperature stability better than 0.03℃/10 min. In addition, the algorithm has a good rapidity and strong robustness to uncertainties. The temperature control of the blackbody radiation source is improved by real-time observation and effective compensation of the system state and unknown disturbances.