Ferrari Mailing List: Re: Technology in cars/Stupid drivers (was Re: Some No.... Michael Schumacher)

[Mike (themightytoe]

What ate you going to recite Snell's law to us too?   My head hurts...

BR,
Mike Fleischer

Sent from my mobile

On Dec 24, 2009, at 3:24 PM, Ken Rentiers <rentiers [at] me.com> wrote:

> Angle of incidence = angle of reflection. An infrared beam emitted  
> from the device will bounce back to a sensor when it hits the glass/ 
> air interface, except if a raindrop is there and the beam then  
> escapes. Because the index of refraction of glass is very much the  
> same as that of water the IR beam passes thru the glass and is sent  
> elsewhere by the curved raindrop surface. The sensor loses its  
> signal and the wipers are triggered.
>
>
> On Dec 24, 2009, at 3:19 PM, Hans E. Hansen wrote:
>
> > Most GM cars do too.  I haven't touched the headlight switch in many
> > years.
> >
> > Interesting how the auto wipers work.  The rain hits a small
> > grid on the W/S (often behind the rear view mirror) and an
> > optical sensor detects distortion in the light passing thru.
> >
> > Hans.
> >
> > On Thu, Dec 24, 2009 at 12:58 PM, Ken Rentiers <rentiers [at] me.com>  
> > wrote:
> > > My 2003 sled does both those things.
> > >
> > > On Dec 24, 2009, at 2:48 PM, LarryT wrote:
> > >
> > > > Maybe they think there's automatic headlights - like Volvo offers  
> > > > wipers
> > > > that start when it rains?
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