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Old 10-10-2011, 01:10 PM #1
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Default some statistics from projector diodes

A while back I measured the output of all the diodes while they were still connected to the c@$10 A14O projector. I though I should post the results so people can see what comes out of a projector.

The diodes are running pulsed inside the projector. On the ECO setting the frequency is 120Hz and a 50% duty cycle, or 4.2ms on with a 8.4ms period. With the ECO off it goes to full power, but now it's 3.4ms on with a 8.4ms period, a shorter 40% dutycycle at 120hz.

I numbered the diodes like you would see them if you look at the array headon:

Code:
17  18  19  20  21  22  23  24
9   10  11  12  13  14  15  16
1   2   3   4   5   6   7   8
at this side is the flat cable.
I haven't got the beam profile pictures here, but here is the measured power in milliwatts:

Code:
diode	eco	full
1	575	600
2	610	640
3	560	585
4	730	790
5	755	820
6	720	780
7	725	660
8	600	640

9	610	660
10	675	755
11	725	785
12	745	805
13	720	785
14	675	730
15	680	750
16	645	710

17	625	770
18	700	755
19	755	820
20	755	820
21	705	770
22	635	700
23	635	695
24	620	675
It's very interesting to see that the diodes in the middle of the array are the most powerfull and the diodes at the sides less powerfull. You can multiply the full power column by 2.5 to get the peak power the diodes run at which regularly hits 2W.

The diodes sold here on the forum and everywhere else are usually not tested, the most powerfull diode is a whopping 40% more powerfull compared to the least powerfull diode (585mW vs 820mW). This spread may also be present in our builds, as I assume all the diodes in the projector are ran at the same current. So the regularly made assumption of 1A -> 1W is also affected by this. Without a power meter you can't be that certain about the output power.

And last but not least a photo of the setup at my university, I used a piece of black painted metal with a 6mm hole to pass the beam through. The measurements aren't that precise, the power was drifting and fluctuating a bit, and the alignment of the metal piece wasn't perfect every time. On the left is the Melles Griot power meter I used. I placed a fan next to the diode array to keep it cool.

Attached Thumbnails
some statistics from projector diodes-dscf2899_sw.jpg  


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Old 10-10-2011, 02:20 PM #2
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Default Re: some statistics from projector diodes

Very interesting thread ! I always wanted to find out how much mW the projector is producing. I hope cr@pi0 makes a new lasers projector with diodes capable of more
than 2W. Tha would be awesome !
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Old 10-10-2011, 02:29 PM #3
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Default Re: some statistics from projector diodes

jim edit your post to cr@pi0 we dont want legal trouble for this forum

EDIT: the range of power is much more drastic than i would have amused......
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Old 10-19-2011, 09:53 PM #4
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Default Re: some statistics from projector diodes

So perhaps we were right in our assumptions about binning, but wrong in our guesses on how that binning information was applied to the final product. Makes sense too to have more output in the middle of the beam than on the sides. Now I wonder if a similar power swing can be observed due to heat alone, since it would seem logical that the diodes in the middle of the array would be warmer than the ones on the outside?
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Old 10-19-2011, 10:06 PM #5
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Default Re: some statistics from projector diodes

I have noted there are slight variations in forward voltage from diode to diode. If they are daisy chained in series would that not affect the current distribution? If so would this test not be accurate without seeing the actual current each diode is taking and comparing that to the output of the diode?

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Old 10-19-2011, 11:38 PM #6
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Default Re: some statistics from projector diodes

So how would one explain diode #7?

Its average power decreased after switching off eco mode for some reason..
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Old 10-20-2011, 01:22 AM #7
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Default Re: some statistics from projector diodes

Quote:
Originally Posted by DTR View Post
I have noted there are slight variations in forward voltage from diode to diode. If they are daisy chained in series would that not affect the current distribution?
According to KCL, no. It would be different it they were in parallel.
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Old 10-28-2011, 05:11 PM #8
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Default Re: some statistics from projector diodes

series-parallel with mismatched Vf's would manifest itself as unbalanced currents through each of the series strings, however each diode in a particular series string will always see the same current. Just will drop a different amount of voltage.
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Old 10-28-2011, 10:07 PM #9
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Default Re: some statistics from projector diodes

Each string has its own current source though, as I understand it.
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Old 10-28-2011, 10:19 PM #10
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Default Re: some statistics from projector diodes

Quote:
Originally Posted by bennett326 View Post
jim edit your post to cr@pi0 we dont want legal trouble for this forum

EDIT: the range of power is much more drastic than i would have amused......

+2 for that good advice-not everyone knows to not use thier name--

and +2 to the OP= was asked a while back about this and now I can answer that question- great pic and i want that table!!!TY Blue
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Old 10-31-2011, 03:30 PM #11
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Default Re: some statistics from projector diodes

It's not my table, it's at the university I want one too, too bad they literally weight a tonne and cost a lot too.
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Old 10-31-2011, 03:34 PM #12
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Default Re: some statistics from projector diodes

Quote:
Originally Posted by hakzaw1 View Post
+2 for that good advice-not everyone knows to not use thier name--

and +2 to the OP= was asked a while back about this and now I can answer that question- great pic and i want that table!!!TY Blue
thanks the table is very cool breadboards cost a ton though like i saw a 12" by 12" for $300
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Old 10-31-2011, 07:22 PM #13
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Default Re: some statistics from projector diodes

They make a dense particle board & one made from PVC(?)(for hanging tools)with 1/4inch holes spaces 1 inch apart- I made a crude optic breadboard from a piece works ok but nothing like the read deal. I also thought that this could be used as a guide to drilling holes in an Aluminum plate but the exactness would not be the same unless you got very lucky.
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Spacelas 1178mW 655nm/AixiZ 300mW532&
2 B&W 473nm 5/6mW lab
JETLRS1.3W&1.2W-MGL-H
638 180mW ttl mimi lab (av. 230mW)
405 100mW ttl mini lab
445 300 mW ttl mni lab ^AixiZ^ all for a lumia PJ
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Old 10-31-2011, 07:41 PM #14
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Default Re: some statistics from projector diodes

yeah a drill press does wonders iits no fun to drop $100 but tools are tools..... and yeah pegboard aint the same
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Old 11-05-2011, 01:57 AM #15
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Default Re: some statistics from projector diodes

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Originally Posted by bennett326 View Post
yeah a drill press does wonders iits no fun to drop $100 but tools are tools..... and yeah pegboard aint the same
That's nothing compared to Bluefans bench. The Oscilloscope alone is probably over $10k. I think thats probably his work office bench, or a university lab.
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Old 11-05-2011, 02:10 AM #16
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Default Re: some statistics from projector diodes

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That's nothing compared to Bluefans bench. The Oscilloscope alone is probably over $10k. I think thats probably his work office bench, or a university lab.
he said it was his university lab and if you read the whole thread you would see that i was replying to what hak said about it being hard to cut straight holes
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