[Laser] differential detector

Wed, 21 Apr 2004 23:39:53 -0700 (PDT)

that reminds me of the idea behind the noise canceling
microphone, where you have two or more microphone
elements, combining the signals to cancel out some of
the noise. The microphones are not totally isolated
from each other but each picks up a slightly different
signal along with the random noise. 
* <--fuzzy spot
I have this large plastic mirror i want to use for
optical experiments but it has a very short focal
length and the image it makes is kind of fuzzy and
spread out due to the mirror being only approximately
spherical. The thing is, it seems like i wont be
taking full advantage of the light collecting power
because the image at the focal point is...well, not
exactly a point, but more of an "area" of focus. So i
was thinking more than one detector might be a good
thing, especially when dealing with large diffuse
area's like clouds and not just point sources. This
along with the idea of using more than one detector to
cancel noise seems to go together somehow (more fuzzy
spots) 

> 
> Message: 1
> From: [email protected]
> Date: Tue, 20 Apr 2004 23:22:26 EDT
> To: [email protected]
> Subject: [Laser] differential detector
> Reply-To: [email protected]
> 
> I was browsing the web and found some articles on
> optical detection schemes.  
> Most seemed to create a fuzzy spot above and behind
> my eyebrows ( OK, mostly 
> above and beyond all of me. )  
> 

=====
Tim
[email protected]
http://www.aladal.net/toast/

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