锁相放大器是一种对交变信号进行相敏检波的放大器(The lock-in amplifier is a phase sensitive detection amplifier for alternating signal)

通过STM32程序的编写来形成闭环锁相环，锁住波形的稳定，保持系统的稳定。(Through the preparation of STM32 program to form a closed-loop phase-locked loop, lock waveform stability, maintain the stability of the system)