Old 05-05-2012, 12:37 PM #1
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Default Problem with DIY LPM

Hi all, I have build the <50$ LPM from MarioMaser, but I have got now a problem. The TEC I use is too big. If I use a bigger heatsink, I get better results, but now I use a CPU cooler and measure something about 450mW with my 1W laser.
Is there any other way to calibrate it? I don't want to build a dry ice heatsink .

Here's a pic:


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Old 05-05-2012, 04:46 PM #2
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Default Re: Problem with DIY LPM

Can you tell us exactly what you are doing get your measurements?

First of all, inorder to calibrate an LPM, you need a laser of a known power. Forget the opamp right now, that comes after you have figured out the power of your laser. Once you know the power (for example) just supposing [ it's a1100mW laser] and it holds at 1100mW there for 10 seconds but you get a signal off the TEC at the same time only showing 450mV, you'd have to assume the sensor is 2.444x reading in mV = X mW. 900mV = 2.2W etc ... then set your mariomaster LPM pots accordingly.
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Old 05-05-2012, 07:18 PM #3
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Default Re: Problem with DIY LPM

Thanks, yes I use my spartan for calibration. It's with full batteries at 1100mW. I have the 5K poti at 0R and still get too less output. Not it tells me it is something about 220mW
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Old 05-05-2012, 08:45 PM #4
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Default Re: Problem with DIY LPM

try switching the 5K pot to a 10 or 20K resistor
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Old 05-06-2012, 12:09 AM #5
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Default Re: Problem with DIY LPM

What are you powering your circuit with...
I can't tell from the pic..


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Old 05-06-2012, 12:47 AM #6
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Default Re: Problem with DIY LPM

I use the 5V out of my arduino. But I have solved the problem already . I have put a 2K resistor behind the 5k poti, so i could calibrate it. Thanks MarioMaster! +1
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What I have to say first: Sorry for all mistakes I make. But I hope everyone understands my english, thank's
Lasers:
RGB Laser *click me HARD*
<1mW 337,1nm TEA-laser HOMEMADE!*click me HARD*
150mW 405nm RIP HOMEMADE!
500mW 405nm pen HOMEMADE!*click me HARD*
1000mW 445nm 3D Printed Host Build HOMEMADE! *click me HARD*
1000mW 447nm Dragonlasers Spartan
300mW 532nm Skylaser 517mW peak H532L-S300B skylaser
50mW 589nm Dragonlasers Spartan Variable Power Mod *click me HARD*

500mW 635nm HOMEMADE!*click me HARD*

My first tesla coil! : *click me HARD*
My first BIG one! : *click me HARDER*


Want to make a simple diffraction grating?
http://laserpointerforums.com/f49/di...tml#post952546
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