TerraTec的“费斯”与“火龙”

TerraTec(德国坦克)最新推出的Phase(费斯)22是一款在功能上与MAYA44 Pro类似的专业音频产品，与MAYA44 Pro的相同之处是支持24bit／96kHz的音频回放，而且它们都带有S／PDIF输出接口。与MAYA44 Pro不同的是：Phase22带有24bit／l92kHz的音频输入、MIDI／O接口和S／PDIF输入接口，而MAYA44Pro要实现同样的功能则需要单独购买子卡；在输入/输出通道方面，Phase22是两进两出，而MAYA44 Pro支持四进四出，同时还带有光纤输出接口，而Phase22是不带的。     

MAYA44Pro高性价比专业音频接口

适台预算紧张的小型个人录音棚使用的MAYA44 Pro“一专多能”，它除了拥有24bit／96kHz的专业音频处理性能外，还拥有耳机功放，支持专业电容麦克风的12V幻象供电，除此之外还具有数字同轴和光纤输出接口，能满足入门级专业用户的全方位需要。     

基于TMS320VC54X的实时卫星信号跟踪系统

介绍了一种在移动载体上实现卫星信号实时跟踪的系统设计方案，该方法以TMS320VC54X为核心信号处理芯片，利用姿态敏感元件稳定运动中的卫星接收天线，以使其始终对准所要跟踪的同步卫星，文章给出了这种方法的硬件原理和主要的软件设计思路。     

工业用高功率光纤激光器

IPG光子日本株式会社现已开始出售IPG集团的各种型号工业用高功率光纤激光器。     

光纤荧光传感器衰减寿命的加权对数拟合法

荧光寿命的检测是荧光光学传感器的核心内容，国际上尝试了多种方法来拟合这种理论上为单指数衰减信号的荧光衰减曲线。这些方法包括非线性函数标准拟合方法。即Levenburg-Marquardt方法，以及Prony方法、FFT方法，对数拟合法等等。为了克服在实际应用中发生的信号退化，需要在测量信号衰减寿命的同时测量信号的初始强度。文章介绍了一种加权的对数拟合法，经计算机仿真及实际数据测试均可以得到和Levenburg-Marquardt方法非常接近的结果，且拟合时间大大缩短，测量稳定性大大提高。仿真测试及具体实验测试结果显示了这种方法的有效性。该方法不仅与Levenburg-Marquardt方法的偏差曲线非常相似，而且实验测得的荧光寿命与Levenburg-Marquardt方法偏差在0．2％以内。     

Distributed Optical Fiber Sensor for Multi-point Temperature Measurement

The distributed optical fiber sensing technology is overviewed, which is based on Raman scattering light theory. Basic operation principle, structure, system characteristics and signal processing are discussed. This structure and method of the signal processing possess of certain spatial resolution, hence will ensure the practicability of system.     

Experimental Research on Erbium-doped Superfluorescent Fiber Source

The effects of the variations in fiber length, fiber mirror reflectance on efficiency and output power are experimentally investigated for erbium-doped double pass backward superfluorescent fiber sources (SFSs). The influence of fiber length on mean wavelength stability (MWS) has also been demonstrated. By incorporating a short section of un-pumped erbium-doped fiber (EDF) at the output port, the pump power dependent on MWS becomes independent of pumped EDF length. This is a novel phenomenon that hasn‘t been reported up to now,and should be helpful to SFS fabrication and theory analysis. By using a fiber Michelson interferometer as spectrum slicing component,a multi-wavelength fiber source (MWFS) with ～20 channels (from 1542nm to 1559nm) is got. The MWFS has a channel spacing of ～0. 8 nm which satisfies ITUstandard. The intensity fluctuation among channels is less than 0.5dB,and the extinction ratio of all channels is above 14dB. This kind of MWFS should be useful to wavelength division multiplexing systems.     

激光技术与应用

工〔日〕住泽弘明侧闷7a卜口二夕又一加04,23(4)一131~136 2004060492微细加工用固体激光器=微捆加工用固体卜一了〔日)汕崎逮三彻.70卜口三夕又一2004,23(4)一137一140 2004060493工业用固体激光器的现状=产案用固体卜一廿刃现状〔日〕邓,屋辉座拐‘7o卜口二夕又一加04,23(4)一148一151 2004060494激光加工在重工业领域中的应用二重工案分野忆招汁石卜一廿加工刃通用(日〕石出孝均.7a卜口二夕又一2004,23(4)一153一159 2004060495利用激光产生等离子体的下一代光刻真空紫外乡丈?奋用协赴下次世代 2004060487用激光制作碳纳米管=卜一廿了7’…