Cynosure Acclaim 7000, Техническое руководство

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Apogee Elite/Apogee 5500/Acclaim 7000 850-1257-000, Rev. 2 Page 19 of 70
Technical Guide
Simmer Board and Trigger Transformer
The simmer board provides a low level (~100 mA) DC current through the flashlamps. This
preionization of the flashlamps improves pulse-to-pulse stability and increases flashlamp
lifetime. Simmer is initiated on the simmer board by sending a low energy trigger pulse to the
trigger transformer. The transformer steps up this signal to a high voltage trigger pulse on the
pump chamber. This high voltage pulse ionizes the gas near the flashlamp electrodes by
capacitively coupling through the flashlamps glass envelope. Once breakdown is achieved, a
low power DC current from the simmer board is maintained through the simmer ballast
resistor allowing continuous current flow through the lamps. A current sensing circuit on the
simmer board verifies that this current is present. An optical transmitter located on the simmer
board will then turn on, sending an optical signal to the laser control board as an indication of
simmer status.
Wavelength selection on the Apogee Elite laser is done using a relay to select two separate
trigger transformers. When the relay is in default mode—inactive, the Nd: YAG head trigger
transformer is connected. When the Alexandrite wavelength is chosen, the capacitor bank is
dumped, the trigger select relay activated, and the simmer started through the Alexandrite head.