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how does a leveling laser make a line

Discussion in 'Electronic Repair' started by D. Whyte, May 26, 2006.

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  1. D. Whyte

    D. Whyte Guest

    In an inexpensive leveling laser for home use, (such as the Lazerpro) how is
    the line or cross produced?
     
  2. I think they are using coherent light from the laser through a mask.
     
  3. A line can be produced with a simple cylindrical lens like a glass rod.

    But they probably use a holographic optical element, like the kind found
    in laser pointers with 27 pattern heads. These are just very simple being
    either a line or cross. Search for HOE - holographic optical element.

    --- sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/
    Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/
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    | Mirror Sites: http://www.repairfaq.org/REPAIR/F_mirror.html

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  4. Not quite a mask but probably a holographic optical element.

    --- sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/
    Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/
    +Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm
    | Mirror Sites: http://www.repairfaq.org/REPAIR/F_mirror.html

    Important: Anything sent to the email address in the message header above is
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  5. GregS

    GregS Guest


    I have a cheap Harbor Freight line beam. It looks like a refraction
    grid that makes the line. looks like IIIIIIIIII to make a horizontal
    beam.

    greg
     
  6. n cook

    n cook Guest


    But what produces the verticality/horizontality ?
    The only one I was familiar with 20 or so years ago was a pro bit of kit
    using a gyroscopic spinner to obtain the a level plane of rotation, took
    about 30 seconds to achieve the level.
     
  7. Yep, that's another way, so perhaps that could be called a mask.
    That's probably even cheaper than the HOE, but quite effective.

    --- sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/
    Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/
    +Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm
    | Mirror Sites: http://www.repairfaq.org/REPAIR/F_mirror.html

    Important: Anything sent to the email address in the message header above is
    ignored unless my full name AND either lasers or electronics is included in the
    subject line. Or, you can contact me via the Feedback Form in the FAQs.
     
  8. You can't use two rod lenses as that will just smear out the line produced
    by the first. But the holographic optical element can essentially be made
    to produce any kind of image, so that's one way of doing it. They could
    generate two lines and then combine them but that's excessively complex.

    --- sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/
    Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/
    +Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm
    | Mirror Sites: http://www.repairfaq.org/REPAIR/F_mirror.html

    Important: Anything sent to the email address in the message header above is
    ignored unless my full name AND either lasers or electronics is included in the
    subject line. Or, you can contact me via the Feedback Form in the FAQs.
     
  9. Sam Goldwasser spake thus:
    So no rotating mirrors? That would have been my guess. But maybe too
    complex and prone to breakage for so simple a tool.


    --
    I hope that in a few years it [Wikipedia] will be so bloated that it
    will simply disintegrate, because I can't stand the thought that this
    thing might someday actually be used as a serious reference source.
    Because in its current form, it's not to be taken seriously at all.

    - Horst Prillinger (see
    http://homepage.univie.ac.at/horst.prillinger/blog/archives/2004/06/000623.html)
     
  10. Some professional leveling lasers do use an upward pointing laser with
    a rotating 45 degree mirror above it to produce a line 360 degrees around
    all vertical surfaces.

    But the cheap bubble level replacements don't. :)

    --- sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/
    Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/
    +Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm
    | Mirror Sites: http://www.repairfaq.org/REPAIR/F_mirror.html

    Important: Anything sent to the email address in the message header above is
    ignored unless my full name AND either lasers or electronics is included in the
    subject line. Or, you can contact me via the Feedback Form in the FAQs.
     
  11. D. Whyte

    D. Whyte Guest

     
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