On Wed, Oct 27, 2010 at 4:13 PM, Robin D. Bussell
<RobinB@excelerate.info> wrote:
> Could you use the regularity of the window spacing on the train
> carriages to measure speed by detecting variations in reflected light?
>
> Send a modulated beam across the tracks at the right height and
> analyse what gets reflected back.
>
> Cheers,
> =A0 =A0 =A0 =A0 =A0 Robin.
>
>

The window transparency test sounds very interesting, can try that.
May place a simple light source and check the reflection, or just
using the light from inside to detect the light change, as long as we
know the size of the window, we should be OK.

-- Youda

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