查询词典 reflectometry

An over view of the research background is introduced, and the advantages of the fully distributed optical fiber sensor on base of the OFDR (optical frequency domain backscattering reflectometry) are presented.

本文以分布式温度和光纤微弯损耗为对象以光频域Rayleigh散射和Raman散射为基础研究了全分布式光纤传感器的测试平衡条件、模型和算法。

Thermo-Time Domain Reflectometry has many advantages, such as low cost, less disturbance of the soil and time-saving, thus showing great potential in soil research.

热脉冲－时域反射仪方法所用成本低，对土壤扰动小，测试时间短，具有很多优点，因此在测定土壤热性质方面具有很大的潜力。

Chapter 5, the fully distributed temperature multimode graded-index fiber optic sensor based on spontaneous Raman optical frequency-domain reflectometry is further developed by two methods.

第八章，研究了基于Rayleigh光频域背向散射和Raman光频域背向散射理论同时测量微弯和温度分布的全分布式光纤传感器系统。

In order to cancel the noise in TDR signal and retain the faint reflectometry signal made by deformation of rock and soil, it is proposed to use method integrated filtering and noise canceling based on wavelet transform with characteristic of TDR signal.

为去除TDR法岩土体变形监测信号中因多种原因而产生的噪声，同时最大限度地保留岩土体因变形而导致的微弱反射信号，提出结合小波函数和TDR监测信号特点的滤波与去噪方法。

PURPOSE. To estimate the distributions in width as well as in density of macular pigment in humans at different ages, imaging fundus reflectometry was employed as a tool to reach our aim.

目的：利用眼底影像反射法来评估不同年龄层的人，其黄斑色素光密度分布的宽度。

MEASUREMENT OF SOIL PHYSICAL PROPERTIES WITH THERMO-TIME DOMAIN REFLECTOMETRY Ⅰ.

利用热脉冲-时域反射技术测定土壤水热动态和物理参数Ⅰ。

In this paper the technique of Thermo Time Domain Reflectometry is introduced to make measurements of a wide range of soil physical properties.We outline the theories of TDR technique for water content and electrical conductivity measurement, and heat pulse technique for determination of volumetric heat capacity, thermal conductivity, and thermal diffusivi...

本文以热脉冲技术和时域反射技术的理论为基础，介绍了利用热脉冲技术时域反射技术连续定位测定土壤含水量、电导率、温度和热特性的原理，并利用土壤热特性与容重和含水量的关系，导出了土壤容重、饱和度和通气孔度的计算公式。

This paper presents the principles of the Raman back-scattering effect based temperature sensing and the OTDR (Optical Time-Domain Reflectometry) based positioning.

本文介绍了光纤拉曼散射测温基本原理和基于光时域反射定位原理。

Optical time-domain reflectometry located the regions where optical attenuation occurred due to leakage; optical power meter acquired the transmitted power at the end of fiber, and these events could be identified according to the characteristics of signals.

在光入射端，用光时域反射计对上述事件引发的损耗进行定位；在光输出端，用光功率计检测光功率的变化，并根据信号特徵来判定事件的类型。

Time Domain Reflectometry, or TDR, is an electrical measurement technique. TDR has been used for many years to determine the spatial location and nature of various objects. This paper describes the use of TDR to monitor landslide.

时间域反射测试技术是一种电子测量技术，许多年来，一直被用于各种物体形态特征的测量和空间定位。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。