Design and Implementation of Multi-Load Refrigeration Controller for Infrared Remote Sensing Cameras
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摘要:
制冷控制器是红外遥感相机的重要部组件，其温控精度直接影响着相机成像质量。随着控温性能指标要求越来越高，相机部组件的制冷需求也越来越多，多功能、高性能、低重量、少成本的新型制冷控制器的研制变得越来越迫切。针对这些问题，本文设计集中型多负载红外遥感相机制冷控制器，采用电路模块复用与测控温分离的方法实现多负载控制。硬件上，在传统制冷控制器的基础上进行模块复用小型化设计，实现由“单电源、单主控、多驱动”组成的集中型硬件产品；提出“控制器+测温盒”的测控温分离方法，就近采集温度数据以保证测温精度，从而提高控温精度。软件上，配合硬件方案完成软件架构设计、测控温匹配设计、多负载驱动独立设计、温度数据可靠性设计。以此设计方案为基础，“一带三”制冷控制器的实验数据显示，该设计满足测控温匹配、驱动独立、精密控温的功能性能要求，同时±8 mK的制冷控温精度完全满足了高质量成像要求，该方案可行。
Abstract:The refrigeration controller is an important component of an infrared remote sensing camera, and its temperature control accuracy directly affects the imaging quality of the camera. With increasing requirements for temperature control performance indicators and demand for refrigeration of camera components, the development of new multifunctional, high-performance, low-weight, and low-cost refrigeration controllers has become increasingly urgent. In response to these issues, a centralized multi-load infrared remote sensing camera refrigeration controller that adopts the method of circuit module reuse, temperature measurement, and control separation to achieve multi roads control was designed in this study. In terms of hardware, modular reuse and design miniaturization are carried out on the basis of traditional refrigeration controllers, achieving a centralized hardware product composed of a "single power supply, single master control, and multiple drivers." When a temperature measurement is proposed, the control separation method of "controller + temperature measurement box" is enacted and temperature data is collected nearby to ensure the temperature measurement accuracy and improve the temperature control accuracy. In terms of software, the design incorporates a complete software architecture, measurement and control temperature matching, independent design for multi load drives, and temperature data reliability, in conjunction with hardware solutions. Based on this design scheme, the experimental data of the "Drive and Road Three" refrigeration controller shows that the design meets the functional performance requirements of temperature matching, independent driving, and precise temperature control. At the same time, the cooling and temperature control accuracy of ± 8 mK fully meets the requirements of high-quality imaging, which makes this scheme feasible.
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图 2 传统制冷控制器与测温盒的测温电路对比
Figure 2. Comparison of the temperature measurement circuit between the traditional refrigeration controller (up) and the temperature measurement box (down)
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图 6 优化前后控温精度比对
Figure 6. Comparison of temperature control accuracy before and after optimization
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图 12 测温盒与控制器数据传输实测图
Figure 12. The actual measurement diagram of the data transmission between the temperature measuring box and the controller
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