Noise is one of important errors in attenuation measurement, especially in the large attenuation measurement.
在微波大衰减测量中，噪声是一项主要误差来源。
The attenuation measurement error due to RF leakage in a single channel and a dual channel microwave attenuation measurement system is investigated.
研究了单通道和双通道微波衰减测量系统中的射频泄漏所导致的测量误差。
The process of attenuation measurement is presented, which utilizes a system consisted of a sweep oscillator, a pair of broad-banded horns, and a scalar network analyzer, etc.
陈述了利用扫频信号源、标量网络分析仪和宽带喇叭天线等构成的系统对微波衰减测量的过程，对该方法的诊断误差进行了讨论。
A new method of precise measurement of optical fiber attenuation.
一种新的精确测试光纤衰减方法的探讨。
This paper describes the principle, method and apparatus for measurement of technical light attenuation length of plastic scintillators. The factors that influences this parameter are discussed.
本文报道了塑料闪烁体的技术光衰减长度的测量原理、方法和测量装置，并对影响此参数的因素进行了讨论；
It studies the vertical uniformity of single mode fiber attenuation through measurement and gives its evaluation on the uniformity of present single mode fibers.
通过测试研究了单模光纤衰减的纵向均匀性，并对目前单模光纤衰减的纵向均匀性作出了评价。
In the measurement of optical fiber attenuation, the backscattering method has been shown to have great advantages.
在光纤衰减的测量中，背向散射法显示出很大的优越性。
This paper uses fractal geometry as a tool and fractal dimension as a measurement parameter to analyze the phenomena of fractal attenuation of cartographic object on cartography generalization.
本文以分形作为工具，分维值作为度量参数，研究制图综合中地图目标的分形衰减现象。
The formula can be applied directly into correction for attenuation to radar echoes during data processing for quantitative measurement of precipitation.
所得结果可直接用于雷达定量测量降水时的衰减订正。
Improving measurement accuracy of low level signal is studied using RF attenuation, resolution bandwidth, video bandwidth, and video average.
研究了利用频谱仪射频衰减、分辨带宽、视频带宽和视频平均的方法，提高和改善低电平信号的测量精度。
NSA (the normalized site attenuation) measurement and theoretical calculation model of compact EMC chamber is firstly introduced in this paper.
本文首先介绍了紧缩型电磁兼容(EMC)暗室归一化场地衰减(nsa)的测试方法和理论值的计算模型。
This paper describes the measurement procedure of ultrasonic attenuation coefficients and ultrasonic velocity tomography.
本文对超声衰减系数和超声声速断层成像的测量过程进行了描述。
This paper describes the basic principle, measurement technique and experimental measurement system for determining the attenuation of a waveguide section by means of measurement of q.
本文论述通过q值测量来确定波导段衰减的基本原理、实验方法及系统装置。
By combining theory analysis with test measurement, the velocity attenuation regularity of projectile fragments was discussed.
采用理论分析和试验测试相结合的方法，对弹丸破片的速度衰减规律进行了研究。
In the measurement of infrared radiation characteristics of an object, the atmospheric attenuation in the measuring path is an important factor which has influence on measurement precision.
在测量目标的红外辐射特性时，测量路径上的大气衰减是影响测量精度的一个重要因素。
Taking 863 818 project, "Acoustics optic suspended sand size measurement System", as an example, the measurement results about speed, attenuation, suspended sand size distribution are listed.
文中以作者主持的海洋863项目“声光悬浮沙粒径谱测量仪”为例，列举了声速、声衰减、悬浮泥沙粒径谱的测量结果。
Objective: To study the diagnostic role of broadband ultrasonic attenuation (BUA) in measurement of bone mineral density.
目的：探讨跟骨宽带超声衰减诊断骨质疏松的临床价值。
Objective: To study the diagnostic role of broadband ultrasonic attenuation (BUA) in measurement of bone mineral density.
目的：探讨跟骨宽带超声衰减诊断骨质疏松的临床价值。
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