探测波导全息光栅傅里叶变换光谱的新方法

提出一种利用波导全息光栅分光元件 ,通过测量波导光栅附近区干涉条纹 ,经快速傅里叶变换达到测量光谱的新方法。讨论了波长测量范围和光谱分辨率。给出了在设计波导光栅、确定探测器时应该考虑的几个问题。对系统测量误差进行了分析。该光谱探测方法具有光谱分辨率高、波长范围宽和结构简单等优点。     

Experimental optimization of an erbium-doped super-fluorescent fiber source for fiber optic gyroscopes

Double-pass forward and double-pass backward erbium-doped super-fluorescent fiber sources(EDSFSs) were combined in one configuration.A 980 nm laser diode pumped the same erbium-doped fiber from both directions using a coupler as a power splitter.The double-pass configuration was achieved by coating the fiber end face.Firstly,an optimal fiber length was found to obtain a high stability of output light wavelength with pump power, and then 1530/1550 nm wavelength division multiplexing was used for spectrum planarization,which expanded the bandwidth to more than 22 nm.The final step was a test of temperature stability.The results show that the rate of the central wavelength change kept to below 3.5 ppm/℃in the range of -40 to 60℃and 1-2 ppm/℃in the range of 20-30℃.Considering all the three factors of the fiber optic gyro applications,we selected 80 mA as the pump current,in which case the central wavelength temperature instability was calculated as 2.70 ppm/℃, 3 dB bandwidth 22.85 nm,spectral flatness 0.2 dB,output power 5.17 mW and power efficiency up to 9.92%.This experimental result has a significant reference value to the selection of devices and proper design of ED-SFSs for the application of high-precision fiber optic gyroscopes.     

氦—氖激光血管内照射治疗脑梗塞疗效观察与机制探讨

目的：探讨低能量He-Ne激光血管风照射治疗脑梗塞的疗效。方法：将144例脑梗塞患者附机分为实验组和对照组,各72例,实验组采用低能量He-Ne激光血管内照射治疗,同时结合药物治疗,对照组仅给予药物治疗。结果：实验组和对照组总有效率分别是91.67%和75％,两组疗效显著（P＜0.05）。结论：低能量He-Ne激光血管内照射治疗脑梗塞疗效显著,安全可靠,无付作用。     

A nonlinear optical loop mirror-based linear cavity swit- chable multi-wavelength erbium-doped fiber laser

A nonlinear optical loop mirror (NOLM)-based linear cavity switchable multi-wavelength erbium-doped fiber (EDF) laser is proposed and experimentally demonstrated. Due to the characteristics of the intensity-dependent transmissivity, the NOLM can effectively mitigate the mode competition of the homogenous broadening gain medium, so that the multi-wavelength lasing can be achieved at room temperature. By adjusting the states of the polarization controllers (PCs), the number of the lasing wavelengths in the proposed laser can be adjusted flexibly from 11 to 13 with a wavelength spacing of 0.4 nm around the wavelength of 1 530 nm.     

铅蓄电池正极活性物质利用率

通过实验电池和产品电池（６Ｖ－６０Ａｈ）放电容量测定,筛选出数种有效添加剂,得到了几个较好的配方,提高了铅蓄电池正极活性物质利用率。通过循环伏安法（ＣＶＡ）、Ｘ射线衍射分析、扫描电镜（ＳＥＭ）、孔率以及电导的测定,探讨了不同添加剂对ＰｂＯ２电极组成、结构和性能的影响。     

吸附式制冷应用于回收工业余热的实验研究

一、前言 在我国,据估计每年排出的、温度在100～250℃之间的工业余热相当于5000万吨标准煤,这部分能量只有小部分被利用,而大部分则被排到大气中去了。利用工业余热的方式主要有两种,一是生产热水或热空气;其次是利用工业余热来制冷。最近几年,国外展开了对吸附式制冷的研究工作,并先后研制成功了以太阳能为动力的吸附式     

光SMT和光MCM技术

随着光技术尤其是光通信的迅猛发展和日益普及，光电子器件在电路板上的组装技术受到严峻挑战，低成本，高密度，高性能组装技术已成为时代的迫切需求。本文介绍了光表面组装技术和光多芯片组件这一先进组装技术的开发背景，概念原理及其相关技术，并以芯片载体的不同，着重介绍了光ＭＣＭ的类型及其在光通信等领域的应用。     

油气田水无机阴阳离子含量分析方法的选择及应用

油气田水分析项目复杂,采用的分析方法较多,主要分为手工操作分析与仪器分析。手工操作分析主要有化学滴定法、重量分析法、计算法等,其步骤繁琐,分析周期长,多数水样颜色较深,干扰因素多,滴定终点难以判识,误差大。仪器分析主要有离子色谱法、光谱法、自动电位滴定法等。相对于手工操作分析,仪器分析更为快速准确,但是大型仪器设备及配套的气瓶不方便携带到现场。为确保采用不同方法测定数据的准确性,详细探讨了各分析方法的利弊及各方法的兼容性,通过水分析比对研究,对于正常地层水,化学法与仪器分析法基本兼容。仪器分析的引入刷新了对地层水新的认识,根据水分析数据甄别地层水的方法为油气勘探开发生产提供了有力的地层水地球化学依据。