Comments on: Maps of distances from range finders? http://bmoredorkbot.org/2009/06/maps-of-distances-from-range-finders/ People doing strange things with electricity, hon. Tue, 27 Jul 2010 16:37:10 -0700 http://wordpress.org/?v=2.8.6 hourly 1 By: Les http://bmoredorkbot.org/2009/06/maps-of-distances-from-range-finders/comment-page-1/#comment-11 Les Tue, 16 Jun 2009 19:26:41 +0000 http://bmoredorkbot.org/?p=107#comment-11 Kelly, I have extracted the sonar transducer and board from a Polaroid 660 and reading up on accessing this. I see the problem of covering a range of different distances and the need to adjust the sensitivity/intensity of the signal to accommodate for this range. I will pursue some of your suggestions. I suspect laser will be the route to take. I will bring my dissasembled Polaroid to tonight's meeting. Thanks, Les Kelly,
I have extracted the sonar transducer and board from a Polaroid 660 and reading up on accessing this. I see the problem of covering a range of different distances and the need to adjust the sensitivity/intensity of the signal to accommodate for this range.

I will pursue some of your suggestions. I suspect laser will be the route to take.

I will bring my dissasembled Polaroid to tonight’s meeting.

Thanks, Les

]]> By: Kelly http://bmoredorkbot.org/2009/06/maps-of-distances-from-range-finders/comment-page-1/#comment-7 Kelly Thu, 04 Jun 2009 01:53:24 +0000 http://bmoredorkbot.org/?p=107#comment-7 The problem with using range finders like IR and Ultrasonic is that their detection area is conical so it would pick up the closest of two objects within its field. Also range finders tend to have a zone where they work: either near (a few feet or inches) or far (several yards) You might look into how 3D scanners work. They usually use a linear laser (like a laser level) and a camera. The camera image is analyzed for displacement from a known distance. For instances if an object that is five feet away places the laser in the center of the image, a near object might show the laser beam more to the left and a far object more to the right. The laser usually pans across the image so a number of images would have to be analyzed to get a set of points of varying distance. Resulting in an image. I know there is a 3D imaging company hear in Maryland that does some work creating 3D models of accidents scenes but I can't remember their name. The problem with using range finders like IR and Ultrasonic is that their detection area is conical so it would pick up the closest of two objects within its field. Also range finders tend to have a zone where they work: either near (a few feet or inches) or far (several yards) You might look into how 3D scanners work. They usually use a linear laser (like a laser level) and a camera.
The camera image is analyzed for displacement from a known distance. For instances if an object that is five feet away places the laser in the center of the image, a near object might show the laser beam more to the left and a far object more to the right. The laser usually pans across the image so a number of images would have to be analyzed to get a set of points of varying distance. Resulting in an image.
I know there is a 3D imaging company hear in Maryland that does some work creating 3D models of accidents scenes but I can’t remember their name.

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