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George,
The version I gave works perfectly well. So does the version
you gave! (Provided you reassemble the line in each case).
I guess the brackets in the version I gave are a different
way of expresssing the same thing. And it's an interesting
article.
Guy
Mcnamara, George wrote:
> Search the CONFOCAL archive at
> http://listserv.acsu.buffalo.edu/cgi-bin/wa?S1=confocal
>
> Hi Guy,
>
> I think you meant Webb 2004 OPN - Laser research at Oxford 1960s PMT
> superlinearity = Optics Photoni9cs News page 14-17 (May 2003)
>
> http://www.osa-opn.org/view_file.cfm?doc=%24%28%5C%3F%2DJ0%20%20%0A&id=%24%2
> 9%3C%3B%27IP%20%20%0A
> <http://www.osa-opn.org/view_file.cfm?doc=%24%28%5C%3F%2DJ0%20%20%0A&id=%24%
> 29%3C%3B%27IP%20%20%0A>
>
> (note lack of (%5...%24) in the above URL).
>
>
> George
>
> -----Original Message-----
> From: Guy Cox [mailto:[log in to unmask]]
> Sent: Monday, May 02, 2005 5:06 PM
> To: [log in to unmask]
> Subject: Re: Is the 0 to 256 dynamic range linear?
>
> Search the CONFOCAL archive at
> http://listserv.acsu.buffalo.edu/cgi-bin/wa?S1=confocal
>
> Actually PMTs can be pretty linear devices, so long
> as one is not operation at very high or low voltages.
> There is an effect which boosts the gain slightly
> in the midpoint of the range but proper circuitry
> can eliminate that. It's very clearly explained
> at the following reference:
>
> http://www.osa-opn.org/
>
> view_file.cfm?doc=%24(%5C%3F-J0%20%20%0A&id=%24)%3C%3B'IP%20%20%0A
>
> NB this is a long link and will probably have a
> line break so you may need to 'reconstruct' it.
>
> The paper mentioned is interesting in its own right,
> too - it concerns the early days of lasers.
>
> Guy
>
>
> > Dear Deborah--
> >
> > I think that the dynamic range can be linear only if one
> is using photon
> > counting. I'm not sure that's even possible on some
> systems.
> >
> > Good luck!
> >
> > Martin Wessendorf
> >
> >>> When the gain and offset of the detectors are correctly
> set and no
> >>> averaging is used, is the 0 to 256 dynamic range linear
> on a confocal
> >>> image?
> >>>
> >>> Many thanks!
> >>> Deborah Wessels, Ph.D.
> >>> W.M. Keck Dynamic Image Analysis Facility
> >>> Room 14 BBE
> >>> Department of Biological Sciences
> >>> University of Iowa
> >>> Iowa City, IA 52245
> >>>
> >>> phone: (319) 335-2883
> >>> FAX: (319) 335-2772
> >
> > --
> > Martin Wessendorf, Ph.D. office: (612)
> 626-0145
> > Assoc Prof, Dept Neuroscience lab: (612)
> 624-2991
> > University of Minnesota Preferred FAX: (612)
> 624-8118
> > 6-145 Jackson Hall, 321 Church St. SE Dept Fax: (612)
> 626-5009
> > Minneapolis, MN 55455 E-mail:
> [log in to unmask]
> >
>
>
> --
> Associate Professor Guy Cox
> Electron Microscope Unit,
> University of Sydney,
> NSW 2006, Australia
>
> Phone:+61 2 9351 3176 Fax:+61 2 9351 7682
> http://www.guycox.net
--
______________________________________________
Associate Professor Guy Cox, MA, DPhil(Oxon)
Electron Microscope Unit, Madsen Building F09,
University of Sydney, NSW 2006
______________________________________________
Phone +61 2 9351 3176 Fax +61 2 9351 7682
Mobile 0413 281 861
______________________________________________
http://www.guycox.net
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