Laser Calorimetry

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Thread: Laser Calorimetry

  1. #1
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    Default Laser Calorimetry

    Hi all,
    Newbie here with my 50W Chinese blue laser cutter
    Has anyone recently /designed or built a way to measure power output?
    Absolute wattage would be great but even a relative measurement would suffice for now -
    to keep track of anything that is deteriorating, getting dirty, out of alignment etc.?
    1. Would like to measure in front of each mirror
    2. Have a voltage or resistive output proportional (not necessarily linear) to laser power
    3. Parts cost less than $50 ???

    I've read about thermoelectric devices but not sure how to implement - i.e. properly coated aluminum,
    PN Peltier juctions, etc. Was thinking of trying something similar with NTC resistors but need some help...

    Thanks for any feedback,
    Dennis

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    Default Re: Laser Calorimetry

    Right about $50 when you buy the dohickey from him and order the yellow temp device off of ebay:



    If you are not familiar with Russ and his videos:
    https://www.youtube.com/user/SarbarMultimedia/videos

    If you want a tighter/more distilled set of videos from him, view the ones he made for ThinkLaser. You just want to view the "How to use a laser cutter" ones.
    https://www.youtube.com/channel/UCt0...FJRBdfA/videos

    "80 Watt” 700mm x 500mm Ke Hui KH-750 Laser (Similar to the Red Sail)


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    Default Re: Laser Calorimetry

    Thank you very much for the lead. Sent a notice off to Russ for the 'dohickey'.
    I've watched about 25 and learned a lot from his videos -guess I missed No. 53.
    I must have gotten a pretty well set up machine - right out of the box its been doing
    1/4 " MDF or Acrylic in the 8-10mm/sec range at 65-70% power (50W nominal machine).

    Cheers



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    Default Re: Laser Calorimetry

    >>right out of the box its been doing 1/4 " MDF or Acrylic in the 8-10mm/sec range at 65-70% power (50W nominal machine). <<

    That is a good cutting speed for acrylic that thick!

    "80 Watt” 700mm x 500mm Ke Hui KH-750 Laser (Similar to the Red Sail)


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    Default Re: Laser Calorimetry

    For the digital themometer, search ebay for K-Type Digital Thermometer . You will see lots of them. Many like the one Russ used. Some more fancy. When you order, make sure to look for one with free shipping AND that it comes with the two sets of plug in wire probes! I just checked and saw them from as low as $14-ish with shipping from China/Hong Kong. There were other units already located in the US if you wanted faster shipping for $18ish and live in the US. In my experience, receiving shipping from China either goes really well or really bad. Pay attention to make sure it comes with tracking AND that they are shipping via airmail, not via surface/ship because the latter will take a loooong time. My first purchase from China was either never sent or got lost. I lost 30 days waiting around for it before ordering another one that arrived in about 7 days.

    "80 Watt” 700mm x 500mm Ke Hui KH-750 Laser (Similar to the Red Sail)


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    Default

    not a 50$ solution…
    but if you want I have some Ophir OEM digits power meter.
    Need just +/-12V and a standard multimeter
    Up to 30W with no cooling and 150 with water cooling

    Cheers Mark



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