LaserBee VS Ophir. What is this?

[Trevor]

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.

Trevor

 

[ARG]

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.

 

[Trevor]

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.

Trevor

 

[lasersbee]

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...:beer:


Jerry

You can contact us at any time on our Website: J.BAUER Electronics

 

[ARG]

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

500mA

1A

1.6A

 

[lazeristasUVISIR]

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?

 

[ARG]

My room does have a window, but the sun doesn't shine on Canada in the winter

 

[sinner]

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?

 

[lazeristasUVISIR]

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. :san:

 

[ARG]

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.

 

[Pman]

Calibration done? Can't hold my breath any longerop:

 

[lasersbee]

Calibration done? Can't hold my breath any longerop:

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...:beer:


Jerry

You can contact us at any time on our Website: J.BAUER Electronics

 

[ARG]

Calibration done? Can't hold my breath any longerop:

I measured it to be 10% off myself, but the laserbee was picking up noise then, so give or take 2%

 

[Pman]

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