Russell,

On Sat, 24 Dec 2005 00:47:28 +1300, Russell McMahon wrote:

> >> As someone else mentioned I'll need a front-silvered mirror for 
> >> that. I
> >> thought of this option initially, and decided against it as the 
> >> mirror
> >> would eventually get dusty. Cleaning is problimatic as it's high up 
> >> on a
> >> ceiling and would requier special training.
> 
> > In an application of a turning infrared temperature sensor I saw the 
> > dust
> > has been caught with a high voltage electrode.
> 
> A negative ion generator may also be useful. Similar effect but 
> perhaps more aggressive as it actively attempts to cast ions adrift.

As long as the mirror isn't seen as more positive than the ions, in which case it will be dusted-over pretty 
quickly!  I had a negative ion generator in my bedroom, and anything plastic (mains plugs and sockets for 
example) within a few feet of it was covered in a fine dust within a week.

Cheers,


Howard Winter
St.Albans, England


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