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signal
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  信号处理
    Study on MFL Signal Processing for Oil and Gas Pipeline and Evaluation Technique of Pipeline Defects
    油气管道MFL检测信号处理与管道缺陷评估技术研究
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    Study on Signal Processing and Analysing System of Micro Spectrometer
    微型光谱仪信号处理与分析系统的研究
短句来源
    On the processing methods of signal of detection of the pattern visual evoked potential and pattern electroretinogram
    关于模型视诱发电位和模型视网膜电图检测的信号处理
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    Analysis and Design of the Signal Processing System of Laser Scanning Size Autodetector
    激光扫描尺寸自动检测仪信号处理系统的分析与设计
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    Signal Processing System of CCD in Outline Length Measurement Instrument for Hot Steel Slabs
    CCD高温钢坯动态测长仪信号处理系统
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  信号调
    Influences of Several Parameters of Grating Sensor on the Modulation Depth of Moire Signal
    光栅传感器的各部分几何参数对莫尔信号调制度的影响
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    The principles and applications of the breath pressure signal compensating
    呼吸压力信号调理的原理与应用
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    Signal Processing of Micro Flowmeter
    微流量计的信号调理电路
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    ANALYSIS ON THE DECREASE OF SIGNAL MODULATION IN FOURIR TRANSFORM SPECTROMETER
    傅立叶变换光谱仪信号调制度下降的分析
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    Study on Signal Processing and Liquid Pump Improving of the Drop Analyzer
    液滴分析仪测试信号调理及其供液系统改进研究
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  “signal”译为未确定词的双语例句
    Time-Frequency Methods for the Extraction of Feature Information in EEG Signal and Development of Virtual EEG Analyzer
    脑电信号特征信息提取的时频分析方法及虚拟式脑电图仪的研制
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    Analysis of ECG Signal and Development of Virtually Automatic ECG Analyzer
    心电信号分析与虚拟式心电自动分析仪的开发
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    Technology of Brain-Computer Interface Based on Spontaneous Eeg and Research on Recognition Methods of Eeg Signal
    自发脑电脑机接口技术及脑电信号识别方法研究
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    Z-80 microcomputer-based physiological signal memory scope
    Z-80微机控制的生理信息记忆示波器
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    Model BHJ-1 care signal system for unit
    BHJ—1型病区护理信号系统
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  signal
In the early 1960s research into radar signal synthesis produced important formulas describing the action of the two-dimensional Fourier transform on auto- and crossambiguity surfaces.
      
It is shown that the one-dimensional sampling sets correspond to Bessel sequences of complex exponentials that are not Riesz bases for $L^2[-R,R].$ A signal processing application in which such sampling sets arise naturally is described in detail.
      
Given a bandlimited signal, we consider the sampling of the signal and some of its derivatives in a periodic manner.
      
We present a method for finding the dual frame and, thereby, a method for reconstructing the signal from its samples.
      
We show that if no sampling of the signal itself is involved, the sampling is not stable and cannot be stabilized by oversampling.
      
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The Laser Doppler Velocimeter (LDV) system determines the flow velocity by measuring the Doppler frequency shift in light scattered from contaminants in a fluid illuminated by a monochromatic laser feam. The main advantage of the technique over hot-wire anemometers, etc, are its ability to measure the velocity at highly localized points in the flow stream and to do so without disturbing the flow, this Report to review this type of measurement with emphasis on the basic theroy, the optical system and its theory...

The Laser Doppler Velocimeter (LDV) system determines the flow velocity by measuring the Doppler frequency shift in light scattered from contaminants in a fluid illuminated by a monochromatic laser feam. The main advantage of the technique over hot-wire anemometers, etc, are its ability to measure the velocity at highly localized points in the flow stream and to do so without disturbing the flow, this Report to review this type of measurement with emphasis on the basic theroy, the optical system and its theory model, signal detection system, an analysis of the effect of system parameters on signal strengh, spatical resolution and measurement accuracy, etc, and about the advantages and limitations of the optical methol, and the present usefulness of the techniqne and possible further developments.

激光多普勒测速系统是用一束单色激光照射到流体中的杂质质点上,测出其散射光的多普勒频移,然后换算成流体的速度。比之热线风速计等这项技术的主要优点是能测出流体中很小范围内的局部速度,而又不扰动原来的流动。本文着重评论了这种光学方法的基本原理、光学系统、它的理论模型、和讯号检测系统;分析了系统参数对信号强度、空间分辨率和测量精度的影响;还指出了此光学方法目前的应用和将未的发展方向。

This paper introduces the principle on an optical compensation modulation of effective signal in the atomic absorption spectrometry. The theoretic discussion and analogue experimental datum proved that it can eliminte the effect of negative signal on Beer-Lambert law, and enhance the measuring sensibility.

本文提出了分光光度法中有效信号的光补偿调制原理。理论和模拟实验证明,据此可以消除非吸收信号对Beer-Lambert定律的影响并提高测定灵敏度。

A new model Scanning Electron Microscope was developed recentlyon the basis of the first Chinese DX-3 SEM, which has been placed on the marketsince 1975. The resolution of this new model DX-5 is 60A for SE image. It isequipped with a variety of video signal processing devices. The high voltage sourcesupplies a maximum acceleration voltage of 30kV, and the Wehnelt bias, is contro-lled photoelectrically. The specimen chamber is capable of accepting a dual fullyfocused linear-type crystal spectrometer with...

A new model Scanning Electron Microscope was developed recentlyon the basis of the first Chinese DX-3 SEM, which has been placed on the marketsince 1975. The resolution of this new model DX-5 is 60A for SE image. It isequipped with a variety of video signal processing devices. The high voltage sourcesupplies a maximum acceleration voltage of 30kV, and the Wehnelt bias, is contro-lled photoelectrically. The specimen chamber is capable of accepting a dual fullyfocused linear-type crystal spectrometer with optical microscope. The size of theelectron optical column is much smaller than the old model DX-3. A vacuum lineartube with three apertures goes through the bores of the lenses. The specimenstage has five degrees of freedom, and the whole column is mounted on airbuffers to minimize vibration problem. In this paper the performances andcharacteristics of this SEM are given. Some aspects of the electron optical systemdesign, such as reduction of objective abberation, calculation of magnetic circuitusing our coaxial-cylinder approximate model, Schlesinger deflection coil of semi-concentrated distribution, centering of electron gun with a single set deflecting aredescribed. Finally, some difficuit problems of tunning up this instrument to achievehigh performances are briefly discussed.

本文主要叙述我厂最近试制成的DX-5型扫描电镜的性能,电子光学设计方面的一些考虑。该仪器的二次电子象的分辨率为60A~70A,有较完善的视频信号处理系统,并可配两道X光分光光谱仪一个能谱仪和一个光学显微镜。该仪器是非对称物镜,用通常的对称透镜的计算参数加以修正得到正确的象差系数。物镜磁路用近似场的假设计算。扫描线圈的设计主要在大偏转范围内给出均匀场以减少低放大倍数下的畸变。为了有效的收集二次电子,在样品附近放置一个小电极加上15V~30V的电压。一个意外的噪音来源来之于电子枪附近的背反射电子通过真空管道达探测器。为了实现电子束的合轴,在电子束交叉点附近放置一个电磁对中线圈,加上瓷瓶的精确定位可以方便合轴。文章也叙述了在调试中排除了一些问题后达到60A的分辨率。

 
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