----- Original Message ----- 
From: "Peter Todd" <pete@petertodd.ca>
To: "Microcontroller discussion list - Public." <piclist@mit.edu>
Sent: Friday, December 23, 2005 11:52 AM
Subject: Re: [EE] Simple to use 650nm (red) laser diode modules?


>
> 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.

Enrico

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