掺铒光纤自发辐射谱的解析函数

利用980nm半导体激光器作为泵浦源,测量了25cm掺铒光纤的ASE(自发辐射)谱特性,采用L-M(莱文伯-马克特)算法和最小二乘法对实验数据进行拟合,得到了掺铒光纤ASE谱的经验公式。研究结果表明,掺铒光纤ASE谱双峰的中心波长分别为1 530.951和1 555.964nm,R-square(拟合优度)的值达到0.980 72,残差平方和值为4.447 69×10-9。     

A tunable dual-wavelength fiber Bragg grating laser using an external-injected DFB laser

A tunable dual-wavelength fiber Bragg grating (FBG) laser based on a distributed feedback (DFB) laser injection is proposed and experimentally demonstrated. The wavelength spacing can be tuned by adjusting the operation temperature of the DFB laser. When the DFB works at 25 ℃, a dual-wavelength simultaneous oscillation at 1 549.67 nm and 1 553.44 nm with wavelength spacing of 3.77 nm is achieved. Our experimental results demonstrate the new concept of dual-wavelength lasing with a DFB laser injection and the technical feasibility.     

煤矸石制备无机高分子絮凝剂PAC及其絮凝性

以工业废渣煤矸石为原料制备无机高分子絮凝剂PAC,确定了制备的优化条件,运用XRD、IR等手段分析煤矸石和产物PAC的物相特征及其结构,并利用制备的PAC进行模拟生活污水处理试验。结果表明,较佳的煅烧温度为700℃,产物PAC絮凝的最佳浓度为120mg·L~(-1)。     

SIMOTIOND425在接箍上下料机械手上的应用

为了提高加工过程中的生产效率及定位精度,介绍了西门子新一代运动控制系统-SIMOTIOND425 在接箍车丝机专用上下料机械手中的应用.具体阐述了该系统的工艺流程、电气结构和软件设计方法.该设备已投入实际生产,实践应用结果表明,该系统运行稳定可靠,符合生产要求.     

A temperature sensor based on switchable dual- wavelength fiber Bragg grating laser with a semiconductor saturable absorber mirror

A temperature sensor based on a switchable dual-wavelength fiber Bragg grating (FBG) laser with a semiconductor saturable absorber mirror (SESAM) is presented and demonstrated experimentally. The repetition rate of Q-switched pulses is ~17 kHz. The results demonstrate that the measured temperature has good linearity to the wavelength spacing of the two lasing wavelengths and has a temperature sensitivity of 21 pm/ºC covering a range of -10—22 °C. The experimental results prove the feasibility of the proposed temperature sensor.     

基于电磁检测机理的井下环空流量测量方法研究

复杂油气藏的开采面临严重的溢流、漏失等钻井事故风险,实时监测近钻头环空流量信息可以在事故早期发现工况异常,有效降低井控风险。对钻井过程中的环空流量电磁测量方法进行了研究,首先对基于法拉第电磁感应定律的井下环空流量电磁测量方法的测量原理进行了研究;其次分析了井下环空流量电磁测量系统设计思路,详细推导了其虚电流密度分布及其机械结构力学模型;然后,通过有限元仿真软件进行励磁线圈结构优化及主体力学分析得到测量系统的最优结构;最后,搭建井下环空流量电磁测量地面原理样机并进行实验测试验证。实验结果表明,电磁测量原理样机测量精度在1%左右且安全系数大于9,可以满足井下环空流量测量的需要。本文完成的井下环空电磁测量方法,对于后续井下环空流量测量方法的实现以达到早期井控的目的,继而降低钻井风险具有指导意义。