The frequency of DFB LD was driven and controlled through such technology as constant current, temperature control in active area, wavelength lock and etc.
该方案通过采用恒流源、有源区温度控制以及波长锁定等技术方法来实现DFB LD的稳频驱动及控制。
2
Aim: To explore the effect of radio frequency identification (RFID) technology used in the area of drug security control.
前言：目的：探讨无线射频识别技术在药品安全监管领域的应用与作用。
3
High power GTO inverter is used for railway electric traction. Its PWM control is significantly different from variable frequency drive system in conventional industrial area.