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Range Sensor

  1. Mar 21, 2017 #1
    What is the most accurate range finder have you come across? If the laser hit a surface that won't reflect.. would it still register?
     
  2. jcsd
  3. Mar 21, 2017 #2

    Baluncore

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    What range of ranges ?
    Range to what targets ?
     
  4. Mar 21, 2017 #3
    1 to 50 meters.
    or 50 meters to 100 meters.
    What targets can't reflect back?
     
  5. Mar 21, 2017 #4

    Baluncore

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    Some wavelength will always reflect back. Even a black body will get hot when you hit it with an IR laser.
    An efficient diagonal “front surface mirror” would be a difficult target. You could not see it to get a correct range. But you could fire a pellet of reflective paint along the boreline, then get a correct range on the mirror surface.
     
  6. Mar 21, 2017 #5

    berkeman

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    Those are two very different dynamic ranges. 50:1 is harder to deal with than 2:1...

    What is the application? What resolution do you want to achieve? And as aked already, what kind of targets do you want the range to? People? Walls? Vehicles?
     
  7. Mar 21, 2017 #6
    What do you mean 2:1.. 2 meters range only?

    Buildings to measure property & signboards extensions. Do you know of ranger finder where you can aim it at an angle up to a building and it can give you the distance by taking account the angle? Because sometimes there is no horizontal object to aim like upper signs and billboards.
     
  8. Mar 21, 2017 #7

    berkeman

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    LOL, no. dynamic range means max divided by minimum. That goes directly into the accuracy calculations that you should be doing.
    If you can't get a reliable reflection (of light, radar, ultrasound, etc.), then your next best technique is probably optical
    triangulation. Have you looked into optical triangulation yet? It is commonly used in animal hunting range finding applications, for example...
     
  9. Mar 21, 2017 #8

    berkeman

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  10. Mar 21, 2017 #9

    Baluncore

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    Cheap laser range finders, (less than US$50), are available for distances up to about 100 metres. The Pythagoras mode requires a horizontal range to the foot of the wall, which is why they have a bubble level built in.

    Expensive laser range finders now have a two axis accelerometer so they can measure elevation angle. They do Pythagoras without a horizontal range to the wall.

    Included here on pages 10 and 11 are the Pythagoras mode instructions for cheap type.
    http://www.spoton.com.au/wp-content/uploads/2014/06/Powerline-PLM70-Instruction-Manual.pdf
     
    Last edited: Mar 21, 2017
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