鉴别器，鉴频器：一种将输入信号的某一特征，如频率或相位转变为幅度变化装置，其变化大小因信号与标准或参考信号的不同程度而异。
Discriminator: a device that converts a property of an input signal such as frequency or phase into an amplitude variation depending on how the signal differs from a standard or reference signal.
激光功率调节既可以输入0到5 V的模拟信号，也可以输入PWM信号用以控制激光功率的大小。
The laser power can be adjusted by entering either 0 to 5v analog signals or PWM signals.
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