Re: [CAD_CAM_EDM_DRO] Laser distance meters/ laser trackers

Look at Optodyne they do the same thing as renishaw but in the return of the
same signal

Harko

On 11/7/06, Graham Stabler <eexgs@...> wrote:
>
>
> I'm researching laser trackers at the moment with a view to building a
> low resolution one.
>
> If you want to know what one is check out:
>
> http://www.faro.com/content.aspx?ct=uk&content=pro&item=3
>
> http://www.leica-geosystems.com/corporate/en/products/laser_tracker/lgs_35317.htm
> http://www.apisensor.com/
>
> Basically the head tracks a retro reflector and using the angle and
> the distance to the reflector works out position. The returned beam
> from the retro reflector is off-set unless the beam strikes the centre
> and this is used for tracking control (servos try to keep zero offset).
>
> Distance is determined by interferometry (incremental encoding) or by
> time-of-flight phase shift methods that provide absolute distance
> measurement (ADM). Neither of this methods involve triangulation.
> These methods give increadible positioning accuracy (tens of microns)
> at 10's of meters range.
>
> Leica do hand held laser distance meters accurate to +/-1.5mm, I need
> something that can hold 1mm resolution accurately. I'm looking for
> distance measuring modules that can do that but am not having much
> look. I thought I'd cast a line to the group and ask. I'd prefer ADM
> but an interferometer would not be ruled out, Renishaw do them but
> they seem to have two beams, it must be single beam.
>
> Cheers,
>
> Graham
>
>
>


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