rough digitizing using proximity sensors

Alan Marconett KM6VV wrote:

> I don't see an immediate method of mounting them to get 3-axis sensing,
> 'tho. :>(

It would point down, and give an analog voltage (read it with an A/D)
according to the distance (Z). Of course table movement gives X and Y
to get your 3 axes sensing.

Now one problem I see is that if the object is not perpendicular to the
beam, the signal will fall off in relation to the slope. However, since
you end up with a grid, you can then make a mathematical model, which
contains the slopes, which in turn allows you to recalibrate the measurement.

I'll report back later if I achieve any success with it....
- Doug

> > > Doug Fortune wrote:
> > > >
> > > > In the MSC 2000/2001 catalog (http://www.mscdirect.com )
> > > > page 3932 from Omron there is a:
> > > >
> > > > "convergent beam photo-micro sensor" $37.52
> > > >
> > > > both side and end facing sensors
> > > > 2 to 6mm sensing distance
> > > > 0.2 mm differential distance at 3 mm sensing distance
> > > > 100 Hz response frequency
> > > > takes 5-24 Volts