This paper provide a design using a mercury relay and a external signal to control the laser source,you can control the output waveform of the laser source,as well as the parameters of the waveform.

Judging by the problem of magnetic field control system of the press for permanent ferrite magnets by wet-press,we choice the signal of critical magnetic field strength from reed relay as the control signal and design the auto-stop system of the press under lower magnetic field strength to avoid the occurrence of non-acceptable products caused by magnetic field failure.