1) spectrum interposition
频谱间置
1.
Applying the Fourier series theory of periodic signal,this paper analyzes the spectrum structure features of brightness signal and chrominance signal of color TV,and explains the practical significance of spectrum interposition applied in color TV theoretically.
应用周期信号傅里叶级数理论,分析了彩色电视亮度信号和色度信号的频谱结构特点,并从理论上解释了在彩色电视上应用频谱间置的现实意义。
2) inverse placement of spectrum
频谱倒置
1.
The impact of the inverse placement of spectrum for signals with different modulation modes is analyzed, then the method to invert radio signal spectrum is given.
分析了频谱倒置对不同信号调制方式的影响;给出了实现无线电频谱倒置的算法;以多速率数字信号处理理论为基础给出了具有低计算复杂度的实现方案。
5) spatial spectrum
空间频谱
1.
Influence of the observed-scene structure and noise on the precision of correlating Hartmann-Shack wavefront sensing is systematically analyzed,where the scene structure is described with spatial spectrum,and the signal-noise-ratio(SNR) is described with the ratio of the root-mean-square(RMS) of image grey variance to the root-mean-square of noise.
以空间频谱描述图像结构,以图像灰度起伏的方均根值与噪声方均根值之比表示信噪比,系统分析了目标图像结构和噪声对相关哈特曼-夏克波前传感精度的影响。
2.
Often Misunderstandings arise that the spatial spectrum of a linear physical system of finite size is discrete and the spatial spectrum of a linear physical system of infinite size is continuous, i.
常有这样一种错误概念：以为有限物理系统的空间频谱是离散的，而无限物理系统的空间频谱是连续的，即认为一个物理系统的离散或连续的空间频谱特征只取决于该系统的尺寸是有限或无限。
3.
Based on the wave equation,we have developed the theory on harmonic generation of phase aberrated laser with nonuniform intensity profile by applying the spatial spectrum analysis to deal with the nonlinear coupling.
从波动方程出发，应用空间频谱方法处理位相畸变光束的非线性耦合问题，建立了适用于位相畸变且空间光强不均匀光束的谐波转换的理论模型。
6) spatial frequency spectrum
空间频谱
1.
Imitated the optical system of Rowland circle structure, the Rowland sphere structure is built in this paper, the Rayleigh-Sommerfeld diffraction scalar integral formula of electromagnetic wave is simplified on the Rowland sphere structure, the computational formulas of spatial frequency spectrum and diffractional far field distribution from the weakly guiding optical fiber LP mode are derived.
仿照罗兰圆光学系统构造罗兰球光学系统 ,在罗兰球中简化电磁波的瑞利 索末菲标量衍射积分公式 ,推导出折射率阶跃分布的弱导光纤LP模衍射场分布和空间频谱的计算公式。
2.
The spatial frequency spectrum of intensity distribution on the focal plane is analyzed,which shows that the uniformity can be further improved by controlling the low frequency spatial modulations in the focal spot.
基于对均匀照明系统焦面输出光强分布的空间频谱分析,从空间频域的角度,指出通过控制焦斑中的低频调制成分,能够进一步提高实际均匀照明的效果。
3.
In this paper, the performance of the diffractive optical element (DOE) for beam smoothing is analyzed by using the spatial frequency spectrum.
采用空间频谱方法分析了衍射光学束匀滑器件的焦面光强分布 ,重新定义了光能利用率及顶部不均匀性两个参数 ,由于其定义的溯源性 ,能够真实准确地评价束匀滑器件的设计性能。
补充资料：倍频谱带
分子式：
CAS号：
性质：又称倍频谱带。红外光谱分析中的一种谱带；指某个吸收频率为基谐振动频率的2倍或3倍时的吸收带。它的产生是由于两个原子核间的库仑排斥力使振动频率发生了异常变化的结果。泛频带的吸收强度往往很低，因此这个吸收带有时测不出来。
CAS号：
性质：又称倍频谱带。红外光谱分析中的一种谱带；指某个吸收频率为基谐振动频率的2倍或3倍时的吸收带。它的产生是由于两个原子核间的库仑排斥力使振动频率发生了异常变化的结果。泛频带的吸收强度往往很低，因此这个吸收带有时测不出来。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条