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Old 09-15-2013, 02:41 AM #17
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Default Re: Strange Artifacts of new LPM's output...

FWIW my Ophir also does the turn-on overshoot and sometimes the turn-off overshoot. I'm not sure if that's due to me moving the lasers while pressing the button. Might be, since any small movement will create that "ringing" effect on the graph.

Anyone with one of those remote wired tail caps?

Would also be interesting to see if this happens on other thermopile LPMs out there..


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low 445nm: C6 from Survival Lasers (1351mW pk|1289mW avg|1100mW rtd)
high 450nm: NewWish (12.6mW pk|5mW rtd) | Dominator by Blord (3010mW pk|2779mW avg during 5min)
462nm: 501B by Atomic (1507mW avg)
473nm: BWB-10-OEM labby by CNI (10mW rtd)
~462-476nm "Tunablue" by Atomic (1.5W pk)
low 520nm: MXDL pen by DTR (31.6mW pk|28.8mW avg)
high 520nm: Laserlands (8mW avg)
532nm: NewWish (28.6mW pk|26.8mW avg|10mW rtd) | Dapper (30.3mW pk) | Classic (120.0mW pk|103.1mW avg|100mW rtd) | "The Green Box" by Atomic (176.7mW pk|140.0mW avg)
589nm: Spartan from Dragon Lasers (58.4mW pk|37mW avg|50mW rtd)
632.8nm: HeNe pointer by Atomic (0.68mW rtd)
635nm: NewWish (4.6mW avg|5mW rtd)
638nm: Classic from Lazerer (409.3mW pk|389.4mW avg|415mW rtd)
650nm: NewWish (10.6mW pk|5mW rtd) | Dilda (216.3mW avg|200mW rtd)
685nm: laser-in-a-box by Atomic (30.4mW pk|29.3mW avg) | 501B by Atomic (32.4mW avg)
780nm: module (2.7mW avg|5mW rtd)
808nm: Classic modded from a 532nm (162mW avg)
850nm: module (8.8mW avg|7mW rtd)
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Old 09-15-2013, 03:01 AM #18
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Default Re: Strange Artifacts of new LPM's output...

Quote:
Originally Posted by Atomicrox View Post
Anyone with one of those remote wired tail caps?

Would also be interesting to see if this happens on other thermopile LPMs out there..
GREAT IDEA!!!! I have always wanted to invest in a pressure switch but never have. This is great excuse to do it and test results! Give me a few weeks to pay my current bill, order one and have it arrive. Ill post the results for everyne.

BTW with all these bumps, figured there be one response from the OP but listen........................you hear that? Oh yup, nothing!
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Old 09-15-2013, 03:04 AM #19
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Default Re: Strange Artifacts of new LPM's output...

I've got a pressure switch. I can rig up a test tomorrow.

In the meantime, I need to sleep. Just got back from working at a football game.

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Old 09-15-2013, 03:05 AM #20
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Default Re: Strange Artifacts of new LPM's output...

Cool, waiting for your results!
Be sure not to move your hand near the "field of vision" of the sensor. It can pick up human heat 1m away very easily... one could even use them as intruder detectors XD
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850nm: module (8.8mW avg|7mW rtd)
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Old 09-15-2013, 04:49 AM #21
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Default Re: Strange Artifacts of new LPM's output...

Lab laser, anyone?

I'll set one up tomorrow and see what I get. Having the head and the laser bolted down will give clear results
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Old 09-15-2013, 01:41 PM #22
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Default Re: Strange Artifacts of new LPM's output...

I have a couple lab lasers (532 and 405), a digital storage oscilloscope and ophir head but don't have access to all until next weekend so I can't do the test until then. I can still do it though if you want so you guys can confirm the output of a plot from a bare ophir and the rubicon.


PS: I like the tags. lol
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Old 09-15-2013, 07:20 PM #23
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Default Re: Strange Artifacts of new LPM's output...

bahahaha I just saw the tags. OMG whoever did that needs a +100
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Old 09-15-2013, 07:25 PM #24
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Default Re: Strange Artifacts of new LPM's output...

^agreed.
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405nm >> Wickedlasers SONAR by lazeerer peak@968mW
445nm >> Kryton Smooth by lazeerer peak@2075mW
453nm >> Lipstick by rhd peak@158mW
473nm >> Optotronics RPL-B peak@112mW
515nm >> Skylasers HL peak@41mW
532nm >> Novalasers Alpha HP peak@284mW
589nm >> CNI PGL-III-A peak@89mW
594nm >> Laserglow Rigel peak@4mW
635nm >> MXDL by DTR peak@38mW
642nm >> Saillaser peak@23mW
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Old 09-19-2013, 10:48 PM #25
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Default Re: Strange Artifacts of new LPM's output...

Any updates on the lab laser run?

A purely electrical "on" function to the driver might remove this spike - is that the current hypothesis?
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Old 09-19-2013, 10:56 PM #26
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Default Re: Strange Artifacts of new LPM's output...

I got busy and forgot to do it.

School is currently pretty crazy; may have some time tonight.

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Old 09-19-2013, 11:35 PM #27
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Default Re: Strange Artifacts of new LPM's output...

I don't have access to my toys yet so I can't post any. Maybe tomorrow or the next day.
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Old 09-22-2013, 06:34 AM #28
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Default Re: Strange Artifacts of new LPM's output...

Something productive to do on a cold, rainy sunday

Here's the test setup. I used a 150mW 405nm lab laser. I could have also done it with the 77mW 532 labby but results will be the same anyways.

To ensure absolutely no movement of the laser and the LPM from any button pressing, the laser is turned on and off automatically by a signal generator through the TTL input at 0.03Hz. The oscilloscope is triggered on single sweep so the waveform captured is the only one without any movement from button presses.

It's also pretty cool outside so I didn't have any fan or AC turned on so there are no wind drafts to disturb the TEC readings. I also kept the Ophir cover partially closed to block any air movement on the absorber surface.



Here are the output waveforms. These are from the BNC output of my LPM which is directly connected to the Ophir head output. Sorry about the cursor positions, it may be a little off since it's a little hard to see on the scope.





And for good measure, a 0.1Hz modulation with 2sec/div timing on the DSO



edit: PS: I like the new tags hahaha
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Strange Artifacts of new LPM's output...-img_0727.jpg   Strange Artifacts of new LPM's output...-newfile0.png   Strange Artifacts of new LPM's output...-newfile1.png   Strange Artifacts of new LPM's output...-newfile2.png  

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Old 09-22-2013, 01:07 PM #29
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Default Re: Strange Artifacts of new LPM's output...

+1 for testing!
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405nm: NewWish (29.1mW avg|5mW rtd) | Dilda (81.5mW avg|200mW rtd) | 501B by Blord (633mW pk)
low 445nm: C6 from Survival Lasers (1351mW pk|1289mW avg|1100mW rtd)
high 450nm: NewWish (12.6mW pk|5mW rtd) | Dominator by Blord (3010mW pk|2779mW avg during 5min)
462nm: 501B by Atomic (1507mW avg)
473nm: BWB-10-OEM labby by CNI (10mW rtd)
~462-476nm "Tunablue" by Atomic (1.5W pk)
low 520nm: MXDL pen by DTR (31.6mW pk|28.8mW avg)
high 520nm: Laserlands (8mW avg)
532nm: NewWish (28.6mW pk|26.8mW avg|10mW rtd) | Dapper (30.3mW pk) | Classic (120.0mW pk|103.1mW avg|100mW rtd) | "The Green Box" by Atomic (176.7mW pk|140.0mW avg)
589nm: Spartan from Dragon Lasers (58.4mW pk|37mW avg|50mW rtd)
632.8nm: HeNe pointer by Atomic (0.68mW rtd)
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850nm: module (8.8mW avg|7mW rtd)
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Old 09-22-2013, 03:21 PM #30
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Default Re: Strange Artifacts of new LPM's output...

Thanks!
Darn, it just occurred to me that I should have also replicated the "ringing" when holding the laser by hand. It'll have to wait 'till next week though since I'm already away from my toys. I'll update this once I get the chance.
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Old 09-22-2013, 05:40 PM #31
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Default Re: Strange Artifacts of new LPM's output...

While you're at it try a >1W laser as well, in my experience those have a higher initial overshoot.
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589nm: Spartan from Dragon Lasers (58.4mW pk|37mW avg|50mW rtd)
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635nm: NewWish (4.6mW avg|5mW rtd)
638nm: Classic from Lazerer (409.3mW pk|389.4mW avg|415mW rtd)
650nm: NewWish (10.6mW pk|5mW rtd) | Dilda (216.3mW avg|200mW rtd)
685nm: laser-in-a-box by Atomic (30.4mW pk|29.3mW avg) | 501B by Atomic (32.4mW avg)
780nm: module (2.7mW avg|5mW rtd)
808nm: Classic modded from a 532nm (162mW avg)
850nm: module (8.8mW avg|7mW rtd)
980nm: NewWish (81mW pk|5mW rtd) | 2nd line around 490nm

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Old 09-22-2013, 09:30 PM #32
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Default Re: Strange Artifacts of new LPM's output...

I did a test with a ~1.3W laser with a pressure switch. Click for large version.



I zeroed the LPM such that it sat at ~25mW, so that overshoot on the falling edge of the signal would be visible.

For the first on/off cycle, the overshoot reached up to 1389mW, then the reading settled back down to ~1340mW. When the laser was turned off, the reading fell down to 17mW before settling back at 25mW. So, it does indeed overshoot for both rapidly rising and rapidly falling values.

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Last edited by Trevor; 09-22-2013 at 09:31 PM.
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