vk2fro
0
- Joined
- Nov 30, 2009
- Messages
- 1,304
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- 63
I've been mulling over the design of a flexmod for laser diode testing.
These flexmods are great as you can set them up with a current limit, and then adjust them using the analogue modulation, or bypass it and use the onboard pot.
Or rip that pot off the board and replace it with a digital one, which opens up the avenue of microprocessor control.
Add a metering system, and you can not only load test before connecting, but also monitor live diode current as you test.
Its a works in progress (and waiting my next Flexmod P3 from DrLava), but will make checking out that odd diode, or the one you put aside, and forgot what it was a lot easier.
Features I want:
Voltage and current on screen at all times
Small compact design
Control of gain, bias, and interlock chain from uC
Ramp testing (ramps up the current slowly until you hit a button, good for getting lasing threshold, or with a power meter, a particular mW level)
digital pots with 1024 step resolution
Multi flexmod control - make a labby that goes from deep purple through to white, to deep red in one box!
Line control - pick a nm and the lasers are set to it (you'll need to set this up for your particular diode set)
kill switch (emergency stop, closed loop {aka interlock})
CHEAP! (aka basic stamp or PIC)
Any other ideas post them here
These flexmods are great as you can set them up with a current limit, and then adjust them using the analogue modulation, or bypass it and use the onboard pot.
Or rip that pot off the board and replace it with a digital one, which opens up the avenue of microprocessor control.
Add a metering system, and you can not only load test before connecting, but also monitor live diode current as you test.
Its a works in progress (and waiting my next Flexmod P3 from DrLava), but will make checking out that odd diode, or the one you put aside, and forgot what it was a lot easier.
Features I want:
Voltage and current on screen at all times
Small compact design
Control of gain, bias, and interlock chain from uC
Ramp testing (ramps up the current slowly until you hit a button, good for getting lasing threshold, or with a power meter, a particular mW level)
digital pots with 1024 step resolution
Multi flexmod control - make a labby that goes from deep purple through to white, to deep red in one box!
Line control - pick a nm and the lasers are set to it (you'll need to set this up for your particular diode set)
kill switch (emergency stop, closed loop {aka interlock})
CHEAP! (aka basic stamp or PIC)
Any other ideas post them here