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Thread: Pangolin ? laser not perform at maximum

  1. #71
    Join Date
    Nov 2007
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    Cairns, Australia
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    The dimness has nothing to do with software, it's actually your persistence of vision.

    If you draw a line, and that line has say, 10 points, the galvo's do not need to spend nearly as much time drawing it, and as such, the laser is only on for a very short time. Because of this, your eyes do not have enough time to gather the perceived brightness of the actual line, however it is really the same brightness as always.

    By pasting the line over the line many times, all you are doing is increasing the time that the laser is on (More points, so it takes longer to scan), thus giving your eyes time to pick up all the light, and making it look brighter.

    If you have a microcontroller and a LED, you can test this as well. Have a microcontroller turn on an LED for say, 10 microseconds. It'll look dim to you, but it'll still be at full brightness for that 10 microseconds.

    Your eyes act like the long exposure setting on a camera. Longer the light is there, the brighter it is (To a point, of course)

  2. #72
    Join Date
    Apr 2006
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    Orlando, FL - USA
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    A quick search on YouTube turned up this video, in which the guy discusses how meters work, how scopes work, and how they respond to various waveforms. Toward the end of the video he shows how (and why) meters can't possibly show the correct voltage of a pulsed waveform...

    https://youtu.be/ue0wtlrmCJE

  3. #73
    Join Date
    Feb 2008
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    East Sussex, England
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    This came up in a completely different application (trying to find a suitable drive pulse to drive an aftermarket tachometer on my race bike) but wondered if it could be applied here.

    If you can measure frequency and duty cycle on aDMM, could that be applied to an RMS voltage reading to derive peak voltage?
    Frikkin Lasers
    http://www.frikkinlasers.co.uk

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

    I thought it fitting, considering the rocky terrain.

  4. #74
    Join Date
    Jan 2011
    Location
    Santa Cruz, CA
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    309

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    Quote Originally Posted by Pangolin View Post
    A quick search on YouTube turned up this video, in which the guy discusses how meters work, how scopes work, and how they respond to various waveforms. Toward the end of the video he shows how (and why) meters can't possibly show the correct voltage of a pulsed waveform...

    https://youtu.be/ue0wtlrmCJE
    Interesting video Bill, thanks for posting.

    -Sal

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