红外探测器寿命试验自动化真空系统设计

针对目前红外组件寿命试验过程中测试参数时必须更换真空腔的问题,设计了一种用于红外组件寿命试验的自动化、多工位真空系统。提出了以杜瓦为试验中心的总体方案,实现寿命试验过程中原位参数测试。通过真空理论计算和计算机3D建模,进行了系统结构设计;采用可编程逻辑控制器(PLC)为控制核心,通过自动控制抽气回路阀门和泵的启停,实现对寿命试验真空环境的实时监控,以及对真空失效进行报警保护。在完成系统的设计后,进行了试验验证。试验结果表明,所设计的真空系统功能可正常运行,系统在加液氮的情况下,空载真空压强可达3.6710-6 Pa,满足红外组件寿命试验必需的真空环境要求。

Automated vacuum system for lifetime test of IR detectors

During the lifetime test of IR component, the component needed to remove from its vacuum chamber of lifetime test in every parameter measurement, however, the movement may destroy the IR component. To deal with this problem, an automated, multi-station vacuum system for infrared component lifetime test was presented in this paper. By use of a specially designed Dewar as the lifetime test center, it achieved the situ parameter measurement. By the vacuum calculation and computer 3D modeling, the structural of the system was designed. By use of system programmable logic controller (PLC) as the control center, it achieved real-time monitoring and failure alarm protection of the vacuum environment for the lifetime test. Finally, exhaust gas experiment is performs and the results shows that the vacuum system operates normally, and the no-load vacuum pressure is up to 3.6710-6 Pa in the case of liquid nitrogen cooling, which meet the requirement of the long-term lifetime test for space application of infrared detector assembly.