This method also has characteristic of low amplitude detection threshold, it can detect weak signals with amplitude value smaller than 10-3 level.
该方法还具有幅度检测门限值低的特点，可对幅度为10 - 3级以下的信号进行检测。
2
An inverter responses the output of a level greater than or smaller than a threshold value of the low pass filter, and outputs a signal in a high level or a low level.
反相器响应低通滤波器的大于或者小于阈值电平的输出，输出处于高或低电平的信号。
3
It's proved that the cause of high threshold of thulium laser is the heat-distribution particle at low laser energy level.