PD in 3rd gen GSI galvo

**LesioQ** · 03-20-2009, 05:41

That's the MPM-20:

http://www.gs-scanners.com/pdfs/data..._736-79400.pdf

Also DSP driver is mentioned there.
I'll do some tracing later today.

Piotr.K

**mixedgas** · 03-20-2009, 07:24

factory says optical on the web page.

Steve

**LesioQ** · 03-20-2009, 14:25

Okay, I can say "it shines" ! Mostly IR.
3 pairs of photodetectors, each havig own mirror on rotor, all A's going to I=, all B's going to I-, common ground. Central LED in series with 82R goes separately to AGC+ and -.
This requires modification to CT galvos, as those have LED cathode grounded.

And some tasty pictures to follow

Piotr.K

**mixedgas** · 03-20-2009, 15:56

which means that purple ceramic "mirror" assembly with the gold can take some serious "GEES". Probably brazed onto the shaft, correct?

Steve

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