灰阶掩模实现光学邻近校正及计算模拟研究

从光学邻近效应产生机理出发,提出用带灰阶衬线的灰阶掩模实现光学邻近效应精细校正的新方法,并指出掩模图形振幅信息的优化,即合理分布掩模图形的空间频谱,可以改善空间像的光强分布并获得高质量的光刻图样。计算表明,校正后的成像图样与理想像的偏差小于０．９％。     

Reduction of the fiber nonlinearity impairment using optical phase conjugation in 40 Gb/s CO-OFDM systems

In this paper, optical phase conjugation (OPC) located in the transmitter based on four wave mixing (FWM) in a semiconductor optical amplifier (SOA) is first simulated in 40 Gb/s CO-OFDM systems, and the fiber nonlinearity impairment of the transmission link is precompensated before OPC by transmission through a fiber with large nonlinearity coefficient. Simulation results show that the nonlinear threshold (NLT) can be increased by about > 3 dB and maximum Q factor can be increased by about 2 dB for the single-channel system. For 50-GHz-Spacing WDM systems, the maximum Q and NLT are increased by about 1 dB, even in the presence of cross phase modulation (XPM) from neighbouring WDM channels. It is found that this OPC subsystem located in the transmitter, not necessary to be inserted into the middle of link, can mitigate the fiber nonlinearity impairment for both single-channel and WDM systems.     

基于OPC和Wincc的磨机负荷控制系统

针对磨矿自动控制过程中设备间通讯不便的问题,提出了基于OPC技术的磨机负荷自动控制系统。分析了OPC技术的数据访问规范,并用VB编写OPC通讯客户端,以Wincc作为OPC服务器,实现Wincc与VB程序的数据交换,达到对磨机负荷实时自动控制的目的。     

水泥生产线数据采集与存储系统的设计与实现

为了实现水泥厂生产线设备运行状态大量实时数据的存储,考虑到成本,选择关系数据库进行实时数据的存储,提出了中间缓冲和相同数据放弃存储等技术。首先对水泥厂实时数据采集方案设计的过程进行认知和分解,指出关系数据库存储大量实时数据是设计过程中的难点。综上设计了总体模型,采用opc协议与采集服务器进行通信,通过在水泥厂现场部署数据采集客户端运行,效果良好,验证了该设计的有效性。     

高效液相色谱法鉴定葡萄饮品质量及OPC含量测定

采用葡萄饮品试样的色谱图中出现的特征色谱峰与标准样品或参比样中出现的特征色谱峰相比较的方法实现对试样质量的鉴定。测定试样中OPC含量时,用C18(ODS)色谱柱(250 mm×4．6 mm,5μm)进行反相色谱分离。用体积比为13比87比0．05的乙腈+水十三氟乙酸的混合物作流动相,在定性及定量分析中采用紫外检测器,对方法的精密度与回收率作了试验,测定结果的RSD值在1．3％～1．7％,回收率在91％～116％之间,同时用传统的比色法对4种试样中的OPC含量作了比对分析,结果表明HPLC法的结果可信度更高。     

Comparison of the compensation effects of fiber nonlinear impairments with mid-span optical phase conjugation between PDM CO-OFDM system and PDM QPSK system

The compensation effects of fiber nonlinearity in 112 Gb/s polarization division multiplexing(PDM) coherent optical systems by mid-span optical phase conjugation(OPC) based on four wave mixing(FWM) effect are studied. Comparisons of the compensation results between PDM coherent optical-orthogonal frequency division multiplexing(CO-OFDM)system and the single carrier(SC) PDM quadrature phase shift keying(QPSK) system are provided as well. The results demonstrate that nonlinear compensation effect with mid-span OPC in PDM CO-OFDM system is much more obvious than that in SC PDM QPSK system.     

Prediction of melt depth in selected architectural materials during high-power diode laser treatment

The development of an accurate analysis procedure for many laser applications, including the surface treatment of architectural materials, is extremely complicated due to the multitude of process parameters and materials characteristics involved. A one-dimensional analytical model based on Fourier's law, with quasi-stationary situations in an isotropic and inhomogeneous workpiece with a parabolic meltpool geometry being assumed, was successfully developed. This model, with the inclusion of an empirically determined correction factor, predicted high-power diode laser-induced melt depths in clay quarry tiles, ceramic tiles and ordinary Portland cement that were in close agreement with those obtained experimentally. It was observed, however, that as the incident laser line energy increased (>15 W mm⁻¹ s^−1/2), the calculated and the experimental melt depths began to diverge at an increasing rate. It is believed that this observed increasing discrepancy can be attributed to the fact the model developed neglects sideways conduction which, although it can be reasonably neglected at low-energy densities, becomes significant at higher energy densities since one-dimensional heat transfer no longer holds true.