Author Affiliations
Abstract
1 Professional Basic Department, Changzhou Vocational Institute of Mechatronic Technology, Changzhou 213164, China
2 Joint International Research Laboratory of Information Display and Visualization, School of Electronic Science and Engineering, Southeast University, Nanjing 210096, China
3 Public Resource Trading Center, Municipal Administrative Services Management Bureau, Lianyungang 222006, China
The effects of the diameter of SiO2 nanopillars, the diameter of Ag nanospheres, the arrays’ period, and the medium environment on the plasmonic lattice resonance (PLR) formed by Ag nanospheres on SiO2 nanopillar arrays are systematically investigated. Larger diameters of SiO2 nanopillars with other parameters kept constant will widen the PLR peak, redshift the PLR wavelength, and weaken the PLR intensity. Larger diameters of Ag nanospheres with other parameters kept constant will widen the PLR peak, redshift the PLR wavelength, and strengthen the PLR intensity. Larger array periods or larger refractive index of medium environment corresponds to larger PLR wavelengths.
plasmonics diffraction theory resonance multilayer design Chinese Optics Letters
2020, 18(3): 033601
设计并实现了数控变速调焦控制电路，该电路基于双极性三极管(PNP型和 NPN型)使之工作在射极输出器状态，对电机进行驱动。 FPGA接收上位机的控制信息，对电机转动进行高精度控制； DA数模转换器产生可，调模拟电压，调节电机的转速；模拟减法器产生 PNP型和 NPN型三极管的基极控制电压，保证电机正反转转速一致。仿真和实验表明，该电路工作稳定，结构简单，无需继电器，减小了体积，提高了稳定性，有利于产品的小型化，可广泛用于电动镜头内电机手动调焦和自动聚焦等场合，提高了调焦精度。
变速调焦 控制电路 三极管 减法器 focusing with variable speed control circuit transistor subtracter
设计并实现了基于红外热像仪图像处理板 FPGA模块的硬件通讯电路, 该电路采用串行通讯和 FIFO读写方式。通讯电路一方面接收上位机的控制数据并实时应答反馈, 一方面将通过 FIFO与图像处理板的 DSP模块实时进行控制信息交互, 从而形成各模块间的双向通讯链路。该设计避免了传统图像处理板采用专用串行通讯芯片, 如 TL16CP754等, 将该芯片功能通过 FPGA实现, 节省了面积与成本, 提高了系统集成度和稳定性, 利于系统的小型化、低成本发展。仿真与实验结果均表明, 该设计合理, 系统工作稳定。
硬件通讯 热像仪 串行 hardware communication infrared thermal imaging system serial FIFO first-in-first-out (FIFO)
调制传递函数是成像系统性能的重要参数,在进行CCD相机调制传递函数测试时,通常采用矩形靶标而非正弦靶标,使调制传递函数的测试值与相机系统实际调制传递函数值存在差异.本文对CCD相机在系统奈奎斯特频率处的调制传递函数测试结果进行了理论分析.
奈奎斯特频率 调制传递函数测试 CCD相机
