Re: [APML]: Active Light Pollution Reduction

["Kal Krishnan" <krishnan@flatconnect.com>]

Where is the sensor physically located on a typical modern streetlight?
- Kal Krishnan
(krishnan@flatconnect.com)

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> From: Patrick W. Greenlee <patrickg@nosc.mil>
> To: astro-photo@nightsky.com
> Subject: Re: [APML]: Active Light Pollution Reduction
> Date: Monday, October 21, 1996 8:58 AM
> 
> 
> 
> >I heard that the sensor on the light poles are shielded on the side so
> >oncomming headlights won't switch off the light. Is this true?
> >
> >Peter
> 
> Sometimes, sometimes not.  At grazing incidence, diffraction will put a
> significant amount of energy into the sensors capture aperture.
> 
> Patrick
> 
> 
>