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Old 12-03-2012, 03:16 PM #17
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Default Re: LaserBee VS Ophir. What is this?

Quote:
Originally Posted by Benm View Post
Don't you think this could have been cause by one of the 'kinks' in the laserbee calibration plot you discovered? Perhaps the change in optical power is just minimal, but its just at a privot point in the calibration giving these huge variations.

One way to resolve that would be to repeat this experiment at, say, 80% of the diode current you are using, so you're measuring in the different range of the laserbee. Perhaps it will then read quite stably too, as you ophir sensor does.
Well dang, that's a really good point. That might factor into it( the big jumps), but I don't think that's *entirely* to blame.

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Old 12-03-2012, 07:48 PM #18
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Default Re: LaserBee VS Ophir. What is this?

That is a good point. Maybe I'll feed some voltage into the Bee to try to figure out where the Knee's are to avoid them.
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Old 12-03-2012, 07:56 PM #19
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Default Re: LaserBee VS Ophir. What is this?

Start very, very, very low. 0.000V preferably.

Walk it up in increments of no more than 5mV at a time until you get a feel for how large the mW jump is, then do not exceed a reading of 3.2W so that you ensure you don't damage the hardware.

Ahem. Rather, do NOT do this. Jerry will probably stop helping you troubleshoot.

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Old 12-04-2012, 12:30 AM #20
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Default Re: LaserBee VS Ophir. What is this?

Quote:
Originally Posted by Trevor View Post
Ahem. Rather, do NOT do this. Jerry will probably stop helping you troubleshoot.

Trevor
Good Point....

Any voltages above anything the supplied LaserBee Thermopile is
rated at that are injected into a LaserBee product may damage
the input circuitry and will void any warranties...

That's an obvious no brainer...


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Last edited by lasersbee; 12-04-2012 at 12:31 AM.
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Old 12-06-2012, 07:26 PM #21
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Default Re: LaserBee VS Ophir. What is this?

Well I didn't test for the knee's in the graph, but here's some data. I moved both sensors further away from the laser (50cm), I moved the bee to a chair below the table and I used two 9V's for the Ophir power supply. The changes seem to have improved the bee's readings. The Ophir readings are now much more like I expected as well.

I got lazy and I didn't want to wait for the laser to reach perfect equilibrium each time These give a good idea of what numbers I'm getting though.
I didn't zero the Ophir either, so -6mW from each reading on the Ophir.

250mA



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1A



1.6A

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Old 12-10-2012, 03:42 PM #22
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Default Re: LaserBee VS Ophir. What is this?

Quote:
Originally Posted by ARGLaser View Post
I moved the bee to a chair below the table and I used two 9V's for the Ophir power supply. The changes seem to have improved the bee's readings. The Ophir readings are now much more like I expected as well.
As I understand no more questions

Has your room windows? Did the sun shine during the measurement?
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Old 12-10-2012, 03:47 PM #23
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Default Re: LaserBee VS Ophir. What is this?

My room does have a window, but the sun doesn't shine on Canada in the winter
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Old 12-10-2012, 04:24 PM #24
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Default Re: LaserBee VS Ophir. What is this?

Very nice testing , and such a useful thread..

Do you think there is a chance that laserbee lpm has been deviating and ophir's not?
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Old 12-10-2012, 04:33 PM #25
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Default Re: LaserBee VS Ophir. What is this?

Quote:
Originally Posted by ARGLaser View Post
My room does have a window, but the sun doesn't shine on Canada in the winter
Oh, Canada.

imho, as you have thermal sensors you observed a fan effect during the first measurements.
If you have time and desire, you may use a beamsplitter to reflect only a portion of beam power to a sensor. The noise should be much large if a blown air still effects senors.
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Old 12-10-2012, 04:41 PM #26
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Default Re: LaserBee VS Ophir. What is this?

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Very nice testing , and such a useful thread..

Do you think there is a chance that laserbee lpm has been deviating and ophir's not?
Perhaps. I will be sending my Ophir off to someone with a +/-1% LPM for re-calibration. Then we will see which LPM is off.
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Old 02-23-2013, 10:37 AM #27
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Default Re: LaserBee VS Ophir. What is this?

Calibration done? Can't hold my breath any longer
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Old 02-23-2013, 11:40 AM #28
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Default Re: LaserBee VS Ophir. What is this?

Quote:
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Calibration done? Can't hold my breath any longer
It's already been done and the Deluxe LaserBee II in question
that is claimed to be 12% off in another Thread has been bought
by us and is on its way to our shop to be tested against a brand
new Coherent FieldMax II-TO as soon as it arrives...


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Last edited by lasersbee; 02-23-2013 at 11:43 AM.
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Old 02-23-2013, 04:19 PM #29
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Default Re: LaserBee VS Ophir. What is this?

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Calibration done? Can't hold my breath any longer
I measured it to be 10% off myself, but the laserbee was picking up noise then, so give or take 2%
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Old 02-23-2013, 04:36 PM #30
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Default Re: LaserBee VS Ophir. What is this?

Thanks for the reply and followup on this. Nice to know customer service still means something to some people. Right back at you guys
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