反射计

This method is independent of the proportional coefficient of the multi-port reflectometer used and makes hardware simpler.

提出了用多端口反射计测量微波网络参数的一种新方法——标量检测矢量变换法。

The analysis of pulse testing system using the reflectometer further shows that the reflectometer can be used for pulse test system.

又对一种反射计法脉冲测试系统分析，进一步说明反射计可用于脉冲测试系统中。

Reflectometer is an equipment for measuring the reflection coefficient.

反射计是测量反射系数的仪器。

Therefore, the reliability and stability of the multi-port reflectometer is improved greatly.

该方法通过标量检测方程，利用取样网络的本征参数进行变换求得复反射系数或网络散射参数，而求解过程与多端口反射计的比例系数无关，从而简化了硬件，提高了多端口反射计的可靠性与稳定性。

An improved multi port reflectometer calibration method using five unit vectors with arbitrary phase is described.

一、引 言校准方法是多端口反射计技术的主要研究课题之一〔1〕。

The calibration of a four state four port reflectometer performed with the presented method and unimproved method shows good agreement between computing results.

对同一响应方程，可以采用不同的校准方法来确定反射计的系统复常数。

A Brillouin scattering-based time domain reflectometer is designed.

设计了基于布里渊散射的光时域反射计。

By analyzing the methods of testing the target reflection characteristics,working principle of the reflectometer and the testing system composed of reflectometer,it is concluded that the reflectometer can be used to the target reflection characteristics measurment.The measurement method,calculation formula,application characteristics,etc are given.

通过分析目标反射特性测试方法、反射计工作原理和由反射计组成的测试系统，得出反射计可以用于目标反射特性测量的结论，并给出测量方法、计算公式、应用特点等。

The comparision with the continuous wave method and double-antenna method shows that the reflectometer essentially is equivalent to a integration of single-station method testing system module.The measurement system which can use single station can be used for reflectance measurement.

与连续波法、双天线法比较，得知反射计本质上相当于单站法测试系统中部分模块的集成，能采用单站法的测量系统就可用反射计测量。

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。

Cynanchum Lingtai apricot production in the average weight 65 grams, the brightly-colored fruit, juicy rich, sweet-sour taste, sweet from the nucleolus, when the late Qing Dynasty famous Shaanxi, Gansu provinces, the Qing imperial court Tongzhi tribute for years.

灵台生产的牛心杏平均单果重65克，果实色泽鲜艳，汁多味浓，甜酸适口，离核仁甜，清末时就驰名陕、甘两省，清同治年间曾为朝廷贡品。

Chenopodium album,Solanum nigrum, and Amaranthus retroflexus were very susceptible to the herbicides. Polygonum persicaria and Abutilon theophrasti were relatively less susceptible to the herbicides, and Lycopersicon esculentum was not susceptible to it. The relationship between reduction rates of weed biomass and PPM values of weed leaves 2,4, and 6 days after treatment was established.

供试的6种杂草对该混剂的敏感性存在显著差异：红心藜Chenopodium album、龙葵Solanum nigrum和反枝苋Amaranthus retroflexus对该混剂最敏感，ED90值分别为47.65、71.67和29.17g/hm2；春蓼Polygonum persicaria和苘麻Abutilon theophrasti敏感，ED90值分别为96.91、114.20g/hm2；而番茄不敏感。