英语语法分析

Time-domain reflectometry( TDR): An impulse is transmitted into the loop.

时域反射器（DR）一个脉冲发射给环路。

The principle of OTDR (Optical Time Domain Reflectometry) for faults location and application of OTDR method is discussed.

探讨了OTDR（光时域反射计）故障定位的原理，说明了OTDR的使用方法。

According to the principles of time domain reflectometry, a new kind of sensor of soil water content measurement is explored.

根据时域反射技术原理，研制了测量土壤含水率的一种新型传感器。