Switchable terahertz polarization converter based on VO2 metamaterial

A switchable terahertz (THz) polarization converter based on vanadium dioxide (VO₂) metamaterial is proposed. It is a 5-layer structure which containing metal split-ring-resonator (SRR), the first polyimide (PI) spacer, VO₂ film, the second PI spacer, and metal grating. It is an array structure and the period in x and y directions is 100 μm. The performance is simulated by using finite integration technology. The simulation results show that, when the VO₂ is in insulating state, the device is a transmission polarization converter. The cross-linear polarization conversion can be realized in a broadband of 0.70 THz, and the polarization conversion rate (PCR) is higher than 99%. Under thermal stimulus, the VO₂ changes from insulating state to metallic state, and the device is a reflective polarization converter. The linear-to-circular polarization conversion can be successfully realized in a broadband of 0.50 THz, and the PCR is higher than 88%.     

醇基燃料高效燃烧智能控制器

目前醇基燃料的燃烧需要人工点火,手动调节油阀来控制燃料流量,危险性较大、不易控制且燃烧效率较低,用户达不到节约成本的目的。为了解决此问题,设计了醇基燃料高效燃烧智能控制器,给出了该控制器系统、软件的组成以及检测结果。测试结果表明,该控制器能够完全实现自动点火,且大大提高了醇基燃料的燃烧率,达到节能的目的,具有广阔的市场前景。