服务于智能制造的智能检测技术探索与应用

为了促进工业4.0与“中国制造2025”战略在制造行业的实施,在智能制造体系中构建有效的控制层级与设备层级,促进车间状态数据与智能制造工艺流程的结合,本文提出了通过智能仪器与智能检测技术实现车间状态智能感知与工艺流程控制的方法,并探讨了智能仪器与智能检测技术在智能制造系统中新的应用模式,同时结合实际项目进行了数字化生产线改造与建设的创新实践,提出了满足智能制造要求的智能仪器与检测技术的发展方向。经项目实践验证,通过智能检测设备与智能仪器的应用,可有效促进智能制造系统中数据采集、智能感知的实现,并为整体工艺流程的智能决策提供有效的数据资源,是智能制造系统建立与完善的关键基础。     

基于设备结构分解的可视化故障推理与诊断技术研究

通过定义热区和热区索引,将故障推理与诊断同设备结构分解相对应,在诊断的过程中构建了故障自动推理编码规则,可将故障树转换成一系列可操作的且具有一定逻辑关系的编码,实现可视化故障自动推理和诊断。通过某型电子装备进行故障推理实例验证,表明该方法层次结构清晰,推理简单有效,能够实现装备可视化的LRU级分层故障诊断和故障的快速定位。     

1 J/pulse Q-switched 2 microm solid-state laser

Q-switched output of 1.1 J/pulse at a 2.053 microm wavelength has been achieved in a diode-pumped Ho: Tm: LuLF laser with a side-pumped rod configuration in a master-oscillator-power-amplifier (MOPA) architecture. This is the first time to our knowledge that a 2 microm laser has broken the joule per pulse barrier for Q-switched operation. The total system efficiency reaches 5% and 6.2% for single- and double-pulse operation, respectively. The system produces an excellent 1.4 times transform-limited beam quality.     

Reaction of layered sodium disilicate SKS-6 with calcium chloride solution as revealed by solid state NMR spectroscopy: exploring the calcium ion extracting mechanism of SKS-6

Solid-state 1H, 29Si NMR and 23Na MQMAS NMR spectroscopy combined with X-ray powder diffraction (XRD) technique was used to study the reaction between layered sodium disilicate SKS-6 and calcium chloride solution with different concentrations. Based on the experimental results the calcium ion extracting mechanism of SKS-6 was demonstrated to be via ion replacement, during which calcium ions replace sodium ions and combine with the non-bridging oxygen in SKS-6 for charge compensation, and simultaneously sodium ions leave the interlayer. This ion-replacement process was greatly influenced by the substitution of sodium ions by protons as well as the calcium ions concentration. Increasing calcium ions concentration favors the replacement of sodium ions by calcium ions, but prevents sodium ions from being substituted by protons.     

Fourier-domain low-coherence interferometry for differential mode delay analysis of an optical fiber

We propose a novel mode analysis and differential mode delay measurement method for an optical fiber using Fourier-domain low-coherence interferometry. A spectral interferometer based on a Mach-Zehnder interferometer setup was used with a broadband source and an optical spectrum analyzer to detect relative temporal delays between the guided modes of a few-mode optical fiber by analyzing spectral interference signals. We have shown that experimental results of the proposed method agree well with those results obtained by using a conventional time-domain measurement method. We have demonstrated that this new mode analysis technique has high sensitivity (<60 dB) and very good resolution (<1 ps/m).     

Evaluation of negative bias temperature instability in ultra-thin gate oxide pMOSFETs using a new on-line PDO method

A new on-line methodology is used to characterize the negative bias temperature instability (NBTI) without inherent recovery. Saturation drain voltage shift and mobility shift are extracted by I_D-V_D characterizations, which were measured before stress, and after every certain stress phase, using the proportional differential operator (PDO) method. The new on-line methodology avoids the mobility linearity assumption as compared with the previous on-the-fly method. It is found that both reaction--diffusion and charge-injection processes are important in NBTI effect under either DC or AC stress. A similar activation energy, 0.15 eV, occurred in both DC and AC NBTI processes. Also degradation rate factor is independent of temperature below 90\du\ and sharply increases above it. The frequency dependence of NBTI degradation shows that NBTI degradation is independent of frequencies. The carrier tunnelling and reaction--diffusion mechanisms exist simultaneously in NBTI degradation of sub-micron pMOSFETs, and the carrier tunnelling dominates the earlier NBTI stage and the reaction--diffusion mechanism follows when the generation rate of traps caused by carrier tunnelling reaches its maximum.     

Effect of ultrasound on adsorption of Geniposide on polymeric resin

The effects of pulse ultrasound with different pulse parameter on the adsorption isotherm and kinetics of Geniposide on Resin 1300 were studied. And the mass transfer model describing the adsorption process was constructed. Amount of Geniposide adsorbed on Resin 1300 in the presence of ultrasound is lower than that in the absence of ultrasound. At our experimental conditions, the adsorption equilibrium constant decreases with increasing ultrasonic intensity and pulse duty ratio, and with decreasing pulse period. In addition, pulse ultrasound can enhance both liquid film diffusion and intraparticle diffusion, and the intensification of liquid film diffusion with pulse ultrasound is stronger than that of intraparticle diffusion. The intraparticle diffusion coefficient D(e)/R2 increases with increasing ultrasonic intensity and pulse duty ratio, and with decreasing pulse period.     

流动速度对核磁共振在线测量的影响及校正

流体流动的核磁共振（NMR）在线测量是一种高效、无损的探测方式,可广泛应用于管道流体输送过程、化学反应动态流程、河流流动等具有时移变化特点的过程在线检测.但是流动状态下样品流速会对NMR测量造成诸如磁化时间不充分、采集信号损失等不容忽视的影响.通过量化分析流动状态对NMR测量的影响因素,提出回波串校正方法,实现流动状态下的NMR流体测量.     

利用超声光栅研究声速与液体性质

设计并搭建了超声光栅,观察了激光经过光栅形成的衍射斑纹,测量了声速;并利用超声光栅测定了不同温度、不同浓度的NaCl溶液中的声速,给出了声速-水温和声速-溶液浓度的依赖关系.水的温度每升高1℃,3.974 MHz的超声波的声速增加2.09 m/s,16.574 MHz的超声波的波速增加2.04m/s;声速随着NaCl溶液浓度的增大线性增加,NaCl溶液浓度每升高1%,3.974 MHz的超声波声速增加13.637 m/s,16.574 MHz的声波声速增加11.757 m/s.在此基础上,分析了不同频率的超声波对实验规律的影响,认为不同频率的超声波在相同条件下测量的溶液中声速大小的不同源于测量的随机误差.     

SiO2-羟基表面上金属原子的第一性原理研究

采用第一性原理方法研究了SiO2-羟基表面上几种金属原子的吸附性质,发现In和Ga在SiO2-羟基表面上的结合很弱,而Fe,Co,Ni在该表面上与Si,O形成强的化学键.等势能面和扩散势垒计算表明In(Ga)的扩散激活能只有0.1-0.3 eV,表明这两种原子容易在表面上扩散.这些结果可以定性地解释纳米合成中的一些实验现象.