一个连续性测试器给电缆导线注入交流信号，从而找到电路故障。
A continuity tester injects an AC signal into the conductors of a cable to find circuit faults.
采用含电机电压模型和电机电感模型的观测器，在低速时注入测试信号，可以得到位置和速度信号。
Position and speed are obtained by an observer using a voltage and an inductance motor model together with test signal injection at low speed.
研究采用高频注入法的无传感器直接转矩控制系统，通过注入特定的高频信号来追踪电机转子的空间凸极效应，以此得到转子位置和速度值。
In the sensorless control system, a specified high frequency signal is injected in to trace the magnetic anisotropy of the motor, by which we can get the value of rotor speed and position.
本文介绍了一种基于脉动高频电压信号注入法实现面装式永磁同步电机无传感器控制的方法。
A method to implement sensorless control of Surface Mounted PMSM based on fluctuating high frequency voltage signal injection was introduced.
研究发现，较大的激光器注入电流可以有效地抑制频率啁啾，较高的注入信号光功率则可以在保证高转换信号消光比的同时抑制频率啁啾。
The results show that higher injected current can restrain the frequency chirp effectively, and higher input optical power can also do that, meanwhile, good extinction ratio is ensured.
基于凸极跟踪的思想，详细讨论了高频电压信号注入法在永磁同步电动机无位置传感器运行控制中的应用。
Based on the thought of salient pole tracking, the paper studied the application of this method in sensorless control of PMSM in detail.
研究了转子位移无传感器检测的两种方法，即小信号注入测试法和差动变压器测试法。
Two methods, which are called as a small test-signal injection and the differential transformer, are studied in order to detect the rotor displacement without sensor.
本文利用半导体激光器良好的调制特性，对其注入电流进行调制，使激光器输出光强随调制信号变化。
Due to the excellent modulation characteristics of laser diode (LD), the infused current of the LD is modulated to make the intensity of the laser beam change with the modulation signal.
研究进一步预示：当激光器气压增大至10倍大气压时，对于同样调谐范围所需的注入信号强度仅比在谱线中心处高出10%左右。
Further study indicates that, when gas pressure is up to 106 Pa, for the same tuning range, the injection intensity is only about 10% higher than the intensity at frequency center.
研究进一步预示：当激光器气压增大至10倍大气压时，对于同样调谐范围所需的注入信号强度仅比在谱线中心处高出10%左右。
Further study indicates that, when gas pressure is up to 106 Pa, for the same tuning range, the injection intensity is only about 10% higher than the intensity at frequency center.
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