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In the research, a Low noise, Wide frequency band, High speed Pre-Amplifier was made, and the dynamic range of the lidar was pressed using high speed multiplier and it give the lidar system better specification.

在激光雷达系统的研制过程中,解决了低噪声、宽频带、高速前放的研制,首次使用高速乘法器进行了动态范围压缩,改善了激光雷达系统的性能。

According to the theory results,the two orthogonal polarized states of the fundamental mode become non-degenerate in this fiber and modal fields are quasi rectangular with appearing strongly linear polarization.And,the birefringence of the fiber was found to be due to the asymmetry of cladding structure.If the rate η between lognitudinal and transverse holes-spacing is reduced,the birefringence will increase strongly.

结果发现,矩形点阵微结构聚合物光纤基模两个正交偏振态不再简并,模场呈现类矩形且具有较强的线偏振特性;该光纤模式双折射产生于包层孔结构分布的不对称性,减小包层纵向孔间隔和横向孔间隔之比η值,双折射明显增强,适当调节η,可在更宽频带范围内实现高双折射单模运行。

The path length refractor, however, can generate planar wavefronts over a wide operating band.

然而,路径长度折射镜能够在宽频带范围内产生平面波。

The measurement of seismometer transfer function is implemented mainly in the low-frequency part, and transfer function in the high-frequency part is obtained with analysis and calculation.

本文对宽频带地震计的频率特性测试是在地震计的低频段进行,对于地震计高频段的频率特性采用理论分析计算获得。

The Model FBS-3A seismometer principle of operation, s-plane pole-zero plot and frequency characteristics are presented.

分析了FBS-3A型等宽频带力平衡地震计的基本原理、零极点的分布和频率特性。

A 360?broad-band analog phase shifter is designed by means of CAD.

摘要该文介绍了宽频带360°模拟移相器的设计理论。

This paper gives a time-synchronization technique bases on GPS time service signal which is used in broad band seismic recorder.

本文给出了一种应用在宽频带地震记录仪中基于GPS授时信号的时间同步技术。

To study the resistivity structure of crust and upper mantle beneath northern and central Tibet, furthermore, discuss thermal behavior of north and central Tibet lithosphere, superwide band magnetotelluric sounding profiles named line 500 and line 600 which belongs to INDEPTH were finished in 1998 and 1999. The line 500 is from Dêqên to Longwei Co, and the line 600 is from Nagqu to Golmud.

为了研究西藏中、北部壳、幔导电性结构,讨论高原中、北部岩石圈热状态,1998年和1999年在西藏中、北部完成了德庆—龙尾错(500线)和那曲—格尔木(600线)超宽频带大地电磁深探测剖面的研究。

The location of the rupture initiation point, the spatial characteristics of the energy radiation sources and the rupture duration time of the 2001 Wes...

通过分析埃塞俄比亚/肯尼亚地震台阵的宽频带波形资料,获得了2001年昆仑山口西大地震的起始破裂点的位置,能量辐射源的空间分布特征,以及破裂持续时间。

The well-conditioned asymptotic waveform evaluation is applied to the MoM solution of scattering from microstrip structures so that the reduced order model is obtained to efficiently evaluate the frequency response over a broadband in this paper.

为了克服传统MoM逐点计算宽频带特性的缺点,本文将WCAWE技术推广应用到微带问题特别是微带散射问题的分析中,克服了传统AWE技术存在数值不稳定性的缺点。

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