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Old 02-03-2008, 12:52 PM #113
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Default Re: DIY Laser Power Meter

Quote:
Originally Posted by positron
[quote author=roSSco link=1200112201/15#20 date=1200673469][quote author=knimrod link=1200112201/15#19 date=1200665971]If those of you outside the US really want one, I'm sure we can figure out how to get it to you.
I'll buy some for those that need it overseas. It's not an illegal to export item is it? :

Paypal me the funds for the item + shipping and I'll be happy to help.

r0ssc0i@yahoo.com[/quote]

Hey r0ssc0,

I would like to take you up on that offer, how can I find out the postage so that I know how much money to send you?

cheers.[/quote]
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Old 02-03-2008, 04:11 PM #114
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Default Re: DIY Laser Power Meter

How's the progress on the pc interface knimrod? I want to buy some from ya!
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Old 02-03-2008, 04:57 PM #115
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Default Re: DIY Laser Power Meter

I bought this meter and the instructions for the dip switches and wiring is confusing!
http://cgi.ebay.com/200Vdc-GREEN-LCD...QQcmdZViewItem

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Old 02-03-2008, 05:21 PM #116
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Default Re: DIY Laser Power Meter

Quote:
Originally Posted by roSSco
I bought this meter and the instructions for the dip switches and wiring is confusing!
http://cgi.ebay.com/200Vdc-GREEN-LCD...QQcmdZViewItem


Did you get the user/installation manual? Let me know if you need it.

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Old 02-03-2008, 05:25 PM #117
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Default Re: DIY Laser Power Meter

Quote:
Originally Posted by Kenom
How's the progress on the pc interface knimrod? *I want to buy some from ya!
I've got the hardware interface working to a degree but the bigger part of the job (at least for me) is the PC application software. If someone out there is willing to write the PC application software for this project, please let me know..
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Old 02-03-2008, 05:54 PM #118
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Default Re: DIY Laser Power Meter

I got it! All that's left is to hot melt mount everything.
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Old 02-03-2008, 06:47 PM #119
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Default Re: DIY Laser Power Meter

If I could plot milliwats vs. current, or possibly vs. voltage, that'd be the most useful to me.
But of course that'd need a voltage input from the laser supply, so it wouldn't be any use to someone with a sealed unit.
Is wattage vs. time a useful plot, compared to just reading the number off the display?
What are your plans for the interface?
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Old 02-03-2008, 07:12 PM #120
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Default Re: DIY Laser Power Meter

Quote:
Originally Posted by Zarniwoop
If I could plot milliwats vs. current, or possibly vs. voltage, that'd be the most useful to me.
But of course that'd need a voltage input from the laser supply, so it wouldn't be any use to someone with a sealed unit.
Is wattage vs. time a useful plot, compared to just reading the number off the display?
What are your plans for the interface?
Currently, my prototype reads the voltage output from the amp and converts it to a 10-bit value (0-1023 mW) for transfer via RS-232. That's it.

I have some plans for a scaling circuit that will extend the range at the expense of some resolution. I was also considering a programmable current source that could drive an LD directly and facilitate automated testing. Adding additional inputs for voltage and current seem like a good idea too. But all this feature creep adds to the development time and cost..

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Old 02-03-2008, 07:51 PM #121
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Default Re: DIY Laser Power Meter

Finally got some pics. The first one shows how I used the connector that came on the board. I cut 3 legs off so it would fit on the new pcb. 8-)
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Old 02-03-2008, 07:54 PM #122
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Default Re: DIY Laser Power Meter

The finished product. It does zero out but jumped to .001 when I took the pic. >

I used a different size case than the one in the parts list. I can't imagine cramming all of that into a smaller case!
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Old 02-03-2008, 08:08 PM #123
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Default Re: DIY Laser Power Meter

In action w/a Dorcy mini.
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Old 02-03-2008, 08:11 PM #124
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Default Re: DIY Laser Power Meter

i want to make one, but im hesitant and not to good with schematics, I dont want to screw anything up. can someone post a video of them making one? if Someone does, Ill order one of your boards
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Old 02-03-2008, 08:13 PM #125
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Default Re: DIY Laser Power Meter

or mabe someone can post a clear close up of the front and back of the finished and soldered GB board... im still confused how the coherent sensor attaches to the board
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Old 02-03-2008, 08:20 PM #126
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Default Re: DIY Laser Power Meter

Quote:
Originally Posted by amkdeath
or mabe someone can post a clear close up of the front and back of the finished and soldered GB board... im still confused how the coherent sensor attaches to the board
The first post on this page shows how I connected the sensor to the board. It was a little difficult to desolder from the original board but with a desoldering iron from Radio Shak it was easy.

I say go for it! If you get one of knimrod's pcbs it is labeled for all of the parts placements. There are pics of it assembled in this thread.
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Old 02-03-2008, 08:52 PM #127
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Default Re: DIY Laser Power Meter

Nice work! I am genuinely impressed. *I really like the idea of re-using that connector. *I may update the PCB to accept the connector directly. *Even if you wind up running the sensor head remotely with a seperate bulkhead BNC connector, you can still use the shielded cable from the stock connector, cutting off the BNC end.. Or better yet, get a BNC to BNC bulkhead adapter (Digi-Key #A97547-ND) and use the complete cable inside the enclosure.
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Old 02-03-2008, 09:26 PM #128
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Default Re: DIY Laser Power Meter

Quote:
Originally Posted by amkdeath
or mabe someone can post a clear close up of the front and back of the finished and soldered GB board... im still confused how the coherent sensor attaches to the board
Maybe this picture will help. The connector in the upper left corner connects to the sensor head with the supplied cable.


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