Based on quantum theory of light, the noise power density spectrum and its timespectrum formula of the intensity fluctuation of a two-mode laser are derived.
采用光场的量子理论导出了自由运转双模激光场强度起伏的噪声功率密度谱及其时谱公式，重点分析讨论了双模激光场的量子统计特性及其拍频噪声的时谱特性和频率调谐特性。
We individually test their modulation transfer function(MTF),noise power spectrum(NPS),noise equivalent number of quanta(NEQ)and detective quantum efficiency(DQE).
我们对我院现有的德国西门子公司NEUOSTARPLUS血管造影系统和北京万东医疗装备股份有限公司CGO -2100C血管造影系统的调制传递函数 (MTF) ,噪声功率谱 (NPS) ,噪声等价量子数 (NEQ )和检测量子效率 (DQE)分别进行了测试。
In this paper the screening methods widely used in optoelectronic coupled devices (OCD) are analyzed,and a new screening method by use of measuring noise power spectrum of OCD is proposed.
本文针对目前用于光电耦合器件筛选方法的不足，提出了用测量光电耦合器件噪声功率谱的方法来筛选掉噪声值大的器件，给出一批光电耦合器件的测量统计结果及在不同工作点时的噪声功率谱，并给出相应的筛选标准。
The system function block diagram and software design were introduced,which can measure the noise power spectrum in frequency-domain,and show the time waveform,also perform the time-domain analysis.
介绍了系统功能框图和软件设计,不仅能够测量光电耦合器的噪声功率谱,而且还能显示时域波形,并完成时域分析。
Based on digital PLL synthesizer analysis model, the phase noise spectral density,the major factor affect phase noise and some ideas to improve the performance of phase noise in digital PLL synthesizer are presented finally.
首先对频率源相位噪声的原理及其表征进行了简要的阐述 ,然后从数字锁相环频率源的分析模型出发 ,对其相位噪声谱密度进行了推导 ,同时分析了影响相位噪声的各项主要因素 ,最后提出了提高数字锁相环频率源相位噪声性能的一些方法。
The concept of" equivalent noisy power spectral density" is introduced in this paper.
文中提出等效噪声功率谱密度的概念。
Estimation of Normalized Noise Power Spectrum of Infrared Imaging System with Polynomial Fitting and MATLAB
利用多项式拟合和MATLAB估算红外成像系统的归一化噪声功率谱
In this paper, a power spectrum of discontinuous narrow band white noise is analysed, and an expression of the power spectrum is obtained.
对间断窄带白噪声的功率谱进行了分析,得到其功率谱的表达式。
RECOGNIZING SHIP OBJECTS BY THE SHAPE OF AVERAGED POWER SPECTRUM OF RADIATED NOISE
按辐射噪声平均功率谱形状识别船舶目标
A study on the spontaneous EEG power spectrum versus occupational noise exposure epiieptic and eoncussion of the brain
自发脑电功率谱与噪声暴露、癫痫和脑震荡关系的研究
Geometric Power Density of Non-Gaussian Noise based on Logarithmic Transform
基于对数变换的非高斯噪声几何功率谱特性分析
Determination of sound power level for noise emitted by woodworking machinery
GB/T3770-1983木工机床噪声声功率级的测定
Determination of sound power levels of noise emitted by household electrical appliances
GB/T4214-1984家用电器噪声声功率级的测定
Study of Upper Frequency Limit and Noise Output Power Characteristics for Microwave Solid State Noise Diodes
微波固体噪声二极管频率上限和噪声输出功率性能的研究
Noise limits for small and medium power diesel engines
GB14097-1993中小功率柴油机噪声限值
Study on Control Technique for Noise of High Power Diesel Engines in Mine
矿山大功率柴油机噪声控制技术研究
Determination of sound power levels of noise emitted by metal cutting machine tools
GB/T4215-1984金属切削机床噪声声功率级的测定
Determination of sound power level for noise emitted by reciprocating pump--Engineering method
GB/T9069-1988往复泵噪声声功率级的测定工程法
Determination of sound power levels of internal combustion engines noise-Quasi-engineering method
GB/T1859-1989内燃机噪声声功率级的测定准工程法
Determination of sound power level for noise emitted by centrifuger separator and filter - Engineering method
GB/T10894-1989分离机械噪声声功率级的测定工程法
Identification of Noise Sources on Air-conditioner Unit and Sound Power Measurement with Air-flow;
空调机噪声源识别与气流下声功率测量
Acoustics--Determination of sound power levels of noise sources using sound pressure--Survey method using a reference sound source
GB/T16538-1996声学声压法测定噪声源声功率级使用标准声源简易法
Acoustics--Determination of sound power levels of noise sources--Precision methods for anechoic and semi-anechoic rooms
GB/T6882-1986声学噪声源声功率级的测定消声室和半消声室精密法
