If the signal frequency to be measured is low, wide strobe gate is required for high measurement precision.
当被测信号频率较低时，需要很宽的选通门才能得到较高的测量精度。
A cantilever is used to block the light reflected into optical fiber, and the vibration signal can be measured through the intensity modulation.
使用悬臂梁来遮挡反射回光纤的光，用光强度调制来实现振动信号的测量。
The electric parameters of rail circuit must be measured periodically to check if the signal system is in good condition and to avoid accident.
定期在线检测电气化铁道轨道电路参数，可确保信号设备工作在最佳状态，避免行车事故。
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