The eXpression of directivity of far field and near field was derived.
推导出了此类换能器的远场指向性和近场声压的表达式。
This method can obtain the estimation of the steering vector directly and is adaptive to both far field and near field models.
该方法可直接获得导向矢量的闭式估计，并且该方法可适用于阵列远场、近场接收信号模型。
Hence, the measurement of the laser propagation characteristics in the far field is the basis for the optical design of optical systems.
因此，对远场激光传播特性的测量是光学系统光路设计的基础。
近场和远场。
The mode of propagation contains near field and far field.
传播方式分近场和远场；
The far field eddy current testing system for trial was developed.
建立了试验远场涡流检测系统。
Results of far field displacement around a circular cavity are given.
文中给出了圆孔周围的远场位移的数值结果。
The computing method using scaling model can be applied to both far field and near field.
缩比模型计算既适用于近场，也适用于远场。
The beam expansion method is suited to approximate the weakly truncated beams in the far field.
光束模式展开法可用于近似计算远场的弱截断光束。
It is shown that the thermal effect decreases the peak intensity and beam focusability in the far field.
结果表明：热效应使远场光束的峰值光强和可聚焦能力下降。
Airport obstacle will influence the far field of Decimeter-Wave Instrument Landing System (DW-ILS) antenna.
机场障碍物的存在会对分米波仪表着陆系统天线辐射场产生一定的影响。
Output force phase should be controlled so as to get the far field signal inphase with the output force phase.
为了保证远场信号的相位与激振力的相位一致，应当控制激振力的相位。
Two ABCD matrices for describing hard apertured Gaussian beams weakly diffracted in the far field are defined.
定义两种描述高斯光束被硬边光阑弱衍射的远场下的光阑ABCD矩阵。
Discussed the stress condition of periphery crack's local tension stress field created by compressing stress in far field.
讨论了远场压应力在裂纹周边附近产生的局部拉应力场的应力情况。
Another important application of diffraction theory is the study of the far field divergence Angle of a collimated light beam.
衍射理论的另一个重要应用就是研究准直光束的远场发散角。
The energy distribution of far field spot for annular aperture Gaussian beam is discussed and the fitting expression is given.
讨论环形孔径高斯光束的远场光斑能量分布，并给出拟合表达式。
Based on the theories of opt-mechanics scanning system and optical transmitting system, the far field scanning system is designed.
根据光机扫描系统理论和发射光学系统理论设计，完成了大口径远场扫描发射光学系统。
Based on the analysis of the far field intensity distribution, the beam quality of unstable resonators has been studied in detail.
在对远场光强分布分析的基础上，对非稳腔的光束质量作了详细研究。
This paper provided a new algorithm used in antenna's planar near field measurements to conduct near field and far field transformations.
本文研究了一种应用于天线平面近场测量中完成近远场变换的数值算法。
It is shown that the beam quality in the far field depends on the initial field distribution, and is degraded with increasing emissive power.
结果表明，远场光束质量与初始场的空间分布有关，且随发射功率增大而变差。
Starting from the propagation theory of partially coherent light, the spectrum of twisted Gaussian Schell-model beams in the far field are studied.
从部分相干光的传输理论出发，研究了被光阑衍射扭曲高斯·谢尔模型光束远场的光谱变化规律。
In the case of far field sources, based on the subspace direction-finding technique, a new method for active calibration of array shape is presented.
文中基于子空间类测向方法，在远场情况下，提出了一种新的估计阵元位置误差的有源校正算法。
Through comparison, it shows that at the same value of frequency and size, the far field of hexagonal piston is more uniform than that of circular piston.
结果表明，与圆形、方形活塞的辐射远场相比，在声波频率、活塞面积相同条件下，六边形活塞声源的辐射远场相对比较均匀。
The influence on the growth morphology of the spherical crystal in the undercooled melt imposed by the far field flow is studied by the asymptotic method.
利用渐近分析方法研究了远场来流引起的对流对过冷熔体中球状晶体的生长形态的影响。
The method can simulate not only the radiation damping of semi-infinite soil, but also the elasticity recovery capacity of the far field media on the boundary.
该方法不但可以较好地模拟半无限地基的辐射阻尼，也能模拟远场地球介质的弹性恢复性能。
A method for planar near field to far field transformation based on element current reconstruction is presented and the basic principle of this method is given.
本文提出了一种新的基于单元电流重构的平面近远场变换方法，给出了该方法的基本原理。
A concept of Ultra wideband radar signal is proposed, and then a time domain imaging algorithm is presented to reconstruct far field images of conducting objects.
给出超宽带雷达信号的概念，提出由超宽带雷达信号散射远场重建理想导体目标简捷的时域成像公式和实现算法。
Fracture diagnosing technique is mainly classified into: direct far field fracture diagnosing, direct near well bore fracture diagnosing and indirect fracture diagnosing.
裂缝诊断的方法主要可分为：直接的远场裂缝诊断技术、直接的近井筒诊断技术、间接诊断方法。
Fracture diagnosing technique is mainly classified into: direct far field fracture diagnosing, direct near well bore fracture diagnosing and indirect fracture diagnosing.
裂缝诊断的方法主要可分为：直接的远场裂缝诊断技术、直接的近井筒诊断技术、间接诊断方法。
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