湍流效应

基于烟气湍流效应的火灾判据

The Fire Criterion Based on the Smoke Turbulent Effect

烟气是火灾过程的重要物理现象，烟气的湍流效应是火灾图像探测的重要影响因素。

Smoke is the important physical phenomena of fire . The turbulent effect of smoke is the main influencing factor of fire image detection .

折迭式FFT算法对激光大气传输湍流效应的数值模拟

Folding FFT modification for laser propagation in the turbulent atmosphere

本文从湍流效应对激光大气通信的影响出发，着重分析了用于激光通信机上的AGC电路。

In this article we emphatically analyse AGC circuit used in the laser communication system .

进行了近地面水平大气中激光传输湍流效应及其自适应光学相位校正实验，对光束振幅起伏、到达角起伏及其远场Strehl比进行了测量分析。

The experiment results of adaptive optics phase compensation for laser beam propagation in the horizontal atmosphere is reported .

本文首先对大气湍流效应、MIMO分集及光MIMO系统和常用的空时编码进行详细介绍，然后对比分析，在此基础上寻找适合在自由空间光通信中被广泛应用的技术。

The paper firstly carries on the detailed introduction of the effects of atmospheric turbulence , the MIMO diversity and space-time coding , and then on the basis of some comparative analysis , it looks for technology widely used in free space optics .

本文报道了用自适应光学系统实时探测和校正距地面约15m高的340m水平传输通道上的大气湍流效应的实验。

The experiments of using adaptive optical system to detect and correct the atmospheric turbulence effect in real-time along a 340 m horizontal path about 15 m above ground are reported .

将GT-POWER中排气管的CFD平均值模型和STAR-CD中的三维模型耦合起来，选用标准的κ-ε模型模拟流场的湍流效应，采用PISO算法对压力场与速度场进行修正。

Coupling the CFD average value model in GT-POWER with three-dimensional model in STAR-CD , the paper has chosen standard k - ε model for simulating turbulence and used PISO arithmetic for modifying pressure and velocity field .

介绍了大气信道中的大气湍流效应，研究了大气湍流对光通信系统、编码特性及误码率的影响，提出了在无线光通信系统中采用脉冲位置调制（PPM）的调制方式。

Illuminate the turbulence effect in atmospheric channel , study the impact towards optical communication system , encoding characteristics and bit error rate ( BER ) in the atmospheric turbulence channel . Propose using pulse position modulation ( PPM ) in wireless optical communication system . 3 .

强湍流效应下激光大气传输短曝光光斑统计分析

Statistical properties of short - exposure images with strong turbulent effects

强激光大气传输时的湍流效应

The turbulence effect of high power laser propagation in the atmosphere

基于大气湍流效应的双波长激光传输特性实验研究

Experimental study on transmission characteristics of dual wavelength laser in atmospheric turbulence

强湍流效应下不同信标波长的自适应光学校正

Compensation Analysis for Different Beacon Wavelengths in Strong Turbulence with Adaptive Optics

报道了聚焦光束传输模拟湍流效应校正的实验研究。

The compensation experiment of simulated turbulence effect of focused beam is reported .

然后总结分析了激光信号的大气衰减效应和大气湍流效应。

Secondly , the atmospheric attenuation and turbulence effects are summarized and analyzed .

大气湍流效应对激光通信的影响及克服措施

Effects of atmospheric turbulence on laser communication system and the methods to weaken them

相位不连续点数与湍流效应特征参数的关系

Relationship Between the Number of Branch Points and the Characteristic Parameters of Turbulence Effect

烟气湍流效应对火灾图像探测的影响

Effects of Smoke Turbulence on Image-based Fire Detection

详述可计入大尺度湍流效应的分谐波的位相屏产生方法。

To be included in the large-scale turbulence effect , the sub-harmonic phase screen selected .

聚焦光束模拟湍流效应自适应光学补偿实验

Compensation Experiment of Focused Beam Turbulence Effect

对传统的激光大气传输湍流效应的数值计算方法进行了改进。

The traditional method of numerical simulations for laser beam propagation in the turbulent atmosphere is modified .

影响空地激光通信链路通信时段选择方案的背景光及大气湍流效应因素

Background light and atmospheric turbulence affecting the choice of space-to-ground laser communications links and communication time period program

在弱湍流效应条件下，光斑扩展受遮拦比影响较大；

The results show that the obscuring ratio has obvious influence on the beam spreading in weak turbulence .

获得了常用遮拦比条件下均强聚焦光束光斑扩展和湍流效应特征参数的定标关系。

Moreover , the scaling relation between the beam spreading and the characteristic parameter described turbulence effects is derived .

针对克服大气湍流效应问题，有很多种方法可供选择。

To overcome the effects of atmospheric turbulence for the problems , there are many ways to choose from .

本文以模拟试验结果为例分析了系统效果和可行性，试验模拟了大气湍流效应对光路的影响。

A simulation test to imitate the effect of turbulence atmosphere is taken to analyze the system effect and feasibility .

结果表明在强湍流效应情况下，信标光相位中存在不连续点

The result showes that there is branch points in beacon light phase in strong scintillation for the measured phase gradient

由于气体的高速流动，产生了湍流效应，而湍流效应的存在，又影响了储层的渗流特性。

High velocity gas flow causes turbulence coefficient , while the existence of turbulence effect affects percolation flow characteristics of a reservoir .

基于对红光激光束大气传输特性的分析，讨论了激光束传输过程中背景光干扰、大气衰减和湍流效应的影响。

Based on analysis on transmission property of red laser beam , impact from background light , attenuation and scintillation are discussed .

在较强湍流效应条件下，不同遮拦比光斑扩展变化趋势相同，此时远场光斑扩展主要还是受湍流效应强弱的影响。

But when turbulence is strong , this influence can be neglected and the beam spreading is mainly determined by the intensity of turbulence effects .