窄带

Subwavelength gratings with different grating parameter have different diffractive properties, and realization of nonpolarizing narrow-band filtering by reasonably designing the parameter of subwavelength grating is a novel method and approach.

亚波长光栅因光栅参量的不同而具有不同的衍射特性，通过对亚波长光栅参量的合理设计来实现消偏振窄带滤波是一种新的方法与途径。

The inverted wavelength conversion of the nonreturn to zero and the format conversion from NRZ to pseudo return to zero are demonstrated synchronously based on single SOA and an optical bandpass filter with 0.32 nm bandwidth. The conversion results depend on the OBF detuning as respect to the probe carrier.

利用半导体光放大器和带宽为0.32 nm的可调窄带滤波器同时实现了40 Gbit/s的非归零信号的反相波长转换和非归零到伪归零信号的码型转换，波长转换和码型转换的结果差异取决于滤波器中心波长相对于探测光波长的失谐量。

From the angle of a beam-forming, the cross- range focusing principle of the synthetic-aperture radar based on nonsinusoidal waves is studied. The expressions of antenna pattern for both rectangular signa l and Gaussian signal are presented. Compared with the conventional narrow bandw idth SAR whose cross-rang resolution is determined by the carrier frequency, th e cross-range resolution of the nonsinusoidal SAR is affected by the signal ban dwidth.

为研究非正弦波SAR的方位向分辨力，从波束形成的角度分析了非正弦波SAR的方位向聚焦原理，导出了基于矩形脉冲和高斯脉冲的合成孔径天线阵列方向图表达式，并与常规窄带SAR进行比较，指出影响非正弦波SAR方位向分辨力的主要因素为合成孔径长度和信号带宽，而与信号载频无关。

In this paper, a novel method for suppressing stationary noises is presented based on the nonstationary of PD.

摘 要：根据局部放电信号的非平稳统计特性，提出了一种用于抑制窄带干扰和测试设备产生的随机性干扰的新方法。

Heating furnace of steel of Lai steel tape transforms nearly 6 years to come through type of accumulation of heat, in producing a course, because a variety of caustic medium such as SO2, H2S are contained inside flue gas conduit, after moving for a long time, conduit wall is rustily below these medium chemistry serious, cause conduit average ply is not worth 1mm, and occurrence bedding face of conduit of local flue gas accumulates rubiginous sodden phenomenon, air leak is serious, increased many and gas use up, and move to heating furnace safety cause menace.

莱钢窄带钢加热炉经过蓄热式改造近6年来，在生产过程中，由于烟气管道内含有SO2、H2S等多种腐蚀性介质，长期运行后，管道内壁在这些介质化学功能下锈蚀严重，造成管道平均厚度不足1mm，而且局部烟气管道出现大面积锈烂现象，漏风严重，增加了大量煤气消耗，且对加热炉平安运行造成威胁。

With the results, the scale of the spectroradiometer is determined and it is used as an absolute spectroradiometer.

用一组窄带滤光片、简易辐亮度计和硅光二极管探测器设计了绝对型光谱辐亮度计。

For realizing the seismic traveltime computation under complex topographical conditions, we present a new method based on linear interpolation and narrow band technique.

为了在复杂地表条件下实现地震波走时计算，提出了一种基于线性插值和窄带技术的走时计算新方法。

In this system, the wavelength of the narrow-bandwidth optical source from the Fabry-Perot tunable filter and broadband source could be adjusted by the digital signal processor after the operating point is changed. Moreover, the influence of the factors such as the instability of the light source and the slowly unaccelerated aging of the system, can be eliminated or decreased by the auto-calibration method based on the software.

该系统利用数字信号处理器控制可调珐珀滤波器自动输出波长满足工作点要求的窄带光，同时还通过软件校准的办法消除了因光源的不稳定、系统老化等缓变因素引起的信号波动对测量结果的影响。

The unflatness of amplified spontaneous emission noise and its impacts imposed on the performance of the off-center narrow filter polarization-nulling method when monitoring the in-band optical signal-to-noise ratio of dense wavelength division multiplexing system are analyzed, and a modified method by introducing an unflat factor in the calculation of OSNR is proposed.

分析了累积自发辐射噪声的非平坦特性，在已有窄带离心偏振置零法测量波分复用系统中带内光信噪比的基础上，分析该方法在噪声非平坦条件下存在的问题，提出了在光信噪比的计算中引入修正因子。

To meet the needs, a novel low-noise fiber laser with compound cavity structure is designed. The stable single-mode operation is realized by using a transient self-written fiber grating, produced by the effect of saturable absorption within a section of unpumped erbium-doped fiber, as narrow band filter for mode selecting and linewidth squeezing. Through optical path modification, the spectral signal-to-noise ratio is better than 62 dB.

激光器采用复合腔结构，以掺铒光纤作为工作物质，通过在未被抽运的掺铒光纤中形成的瞬态自写入光纤光栅的窄带滤波特性进行选模和压窄线宽，产生稳定的单频激光输出；经过光路改进，激光输出光谱信噪比优于62 dB；利用光电负反馈电路，弛豫振荡峰下降了约25 dB，低频段强度噪声也大为改善，有效地抑制了光源的强度噪声。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。