高速条码识别系统

针对目前条码识别算法实时性不够的不足,同时为解决具体应用中定位算法稳定性不高,景深不够等问题,提出了一种基于计算机视觉、FPGA和DSP混合设计的条码识别系统,其高速条码定位算法在FPGA上实现,定位时间仅为2.5ms,定位速度快,同时减少了后续DSP的计算量,大大提高了系统的实时性,并应用于轮胎条码识别系统.经实际试验表明,该系统达到16帧每秒的识别速度,且识别率高,对高速运动条码信息的在线检测应用具有较好的实用价值.     

EDTA impregnation assisted synthesis of nickel nanoparticles embedded in activated carbon and its application for dry reforming of methane

In this paper, the catalysts with nanoscale nickel particles embedded in activated carbon were synthesized by Ethylenediaminetetraacetic acid (EDTA) assisted impregnation method. The experimental results revealed that EDTA addition could promote Ni particle dispersion and decrease Ni particle size. Ni particle size was significantly decreased from 18.23 to 4.57 nm when Ni/EDTA ratio was increased from 1:0 to 1:3. Catalytic performance of Ni₁₅-AC-E₃ demonstrated that CH₄ and CO₂ conversion rate under 850 °C were 90.05% and 96.28%, which were decreased by 1.08% and 1.27% after 72 h dry reforming methane (DRM) reaction. Moreover, the characteristic of the used catalyst showed that Ni particle size was only increased from 4.57 to 5.94 nm after the stability test, and NiO was not appeared. Meanwhile, the deposited carbon in the used catalyst was 5.02%. The above results meant that the catalyst prepared by EDTA assisted impregnation method had the ability of suppressing carbon deposition, Ni particle sintering and oxidation during DRM reaction.