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Thread: Best way to mesure real output from projector?

  1. #11
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    ive always found the best way to measure is using a power meter, so your on the right track
    Eat Sleep Lase Repeat

  2. #12
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    Quote Originally Posted by andy_con View Post
    ive always found the best way to measure is using a power meter, so your on the right track
    Far better than looking through the little window on the projector. That only works once.
    __________________________________________________ __________

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  3. #13
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    Quote Originally Posted by Datsurb View Post
    Hi Mixedgas
    That might be english to you, but pure latin to me.
    I have no clue to what an Laserbee is anticipating, and just want to feed it with the beam at highest possible power. Just to know what i am dealing with.

    So far i have learned that using the testpattern might give the most accurate result without opening the box or removing the modules. If possible, open case and use a bouncemirror to redirect the beam prior to the galvos and shoot an image without blanking.

    This helps a lot.

    Will have time next weekend to do some testing in my workshop.

    Thanks guys
    Glad you got your LPM just fine.
    There is no "anticipation" circuit in your LaserBee 3.7W USB LPM.
    The anticipation circuit is a way to speed up the response time
    of some LPMs like the Scientech LPM and some of the OPHIR Heads.
    There are others....
    These circuits will overshoot the actual maximum of the CW Laser
    under test. Then come down to the true Beam's power.
    This circuit relies on a CW beam to work correctly. By pulsing the
    Beam ion the sensor this circuit (due to the overshoot) will add this
    overshoot at every pulse and falsify the final reading on the high
    side.

    As was stated above... If you can get a full non-blanking image on the
    sensor it should show you the power of that scan.

    @norty...
    the LaserBee sensors don't detect heat as such.
    They detect the temperature differential between the front BB coated
    sensors surface and the rear heat sink radiator.
    The LaserBee that Datsurb purchased has a 15mm X 15mm sensor.


    Jerry
    See the LaserBee II and all other LaserBee LPM products here....
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  4. #14
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    Quote Originally Posted by norty303 View Post
    Basically, you can't, but you can get very close.
    Sorry to correct you but there is a way to get an unmodulated static beam out of QS and Beyond at full power.

    Pangolin put up a video a few days ago in reply to a question by a guy called Matt (it's on their Youtube channel).

    The way to measure power in QS or Beyond is to use Targeted Beams as they are true static non modulated beams, and not constrained by modulation as every other beam out of QS / Beyond is.

    You take a targeted beam, drag the symbol to the centre of the screen, activate it, turn the power up to 100% and you then have a static non modulated beam with which to make an accurate power test:

    Last edited by White-Light; 09-20-2015 at 01:33.

  5. #15
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    I have found the best way to measure the output is to look at the wall in the application I need to use it in and see if it works. Not being a smart ass but you are chasing your tail. It will drive you crazy. I also tried all this and concluded some things don't matter. The difference by even as much as a watt after the first watt can make almost no difference. Plus the additional power for graphics at some point translates to eye pain watching and not a brighter image. I started looking for the lowest power I could use to stop lighting up my room and found that all of a sudden I had subtle color detail that was being washed out by over driving my eyes sort of like this long sentence. Beams are a different issue and more can be gained with a touch of haze then power.

  6. #16
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    Thanks White-Lite.

    Thats just the thing I needed. Will test as soon as i can. Probably not just me wondering about this, so this is what i call a "great find".

    Probably some way of converting the same method for other software such as LSX, Phoenix, Spaghetti etc.
    Last edited by Datsurb; 09-20-2015 at 10:58.
    __________________________________________________ __________

    More projects than time available.
    More projects started than finished.
    More money spent than earned.
    More failure than success.
    Just got to love lasers!

  7. #17
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    I think to be honest that it's probably been hidden deliberately as Pangolin have long said that their aim has been to put dangerous output beyond the reach of all but most advanced users. One way of doing that is to hide it in plain sight in a feature that is of little use to anyone other than the true professional with bounce mirrors .

  8. #18
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    So does that mean Pangolin have done away with the 'housekeeping' cycle in the processing cycle then Al?
    I understood that originally that was a necessary evil that was inherent in the design and nothing whatsoever to do with safety.
    Frikkin Lasers
    http://www.frikkinlasers.co.uk

    You are using Bonetti's defense against me, ah?

    I thought it fitting, considering the rocky terrain.

  9. #19
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    In all honesty I don't know Norty, you'd have to ask Bill. All I know is the video that was posted above and that Pangolin have always been paranoid about target beams although I never really knew why.

  10. #20
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    Norty .......I think he meant the excuse ... not the "reason"

    Click image for larger version. 

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ID:	48476 QS is "horrible" for target beams ...same resolution and precision as a pregnant cow having a dump! (keyword here Bill would have been "logarithmic" ! )

    Cheers
    Last edited by catalanjo; 09-22-2015 at 02:50.

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