On Fri, 6 Aug 1999, Phil Daly wrote:
>
> We will have 4 avalanch photodiodes (APDs) spitting out TTL as each photon
> is detected. These will make their way into a custom card that will
> accrue the counts and provide a fifth channel with the sum of the 4 APDs.
>
In our laboratory we use some specialized hardware cards called
multichannel scalers (MCS). It seems that collecting APD data based
strictly on counter/timers is difficult due to problems with binning
(which may result in lost counts or mis-binning). I'm afraid I don't
recall all of the details right now, but this problem is overcome by
hardware MCS cards. Of course, this is probably only an issue for short
"dwell" times and small numbers of photon counts.
In any case, there are some companies out there with these gizmos on
ISA and PCI cards (in case this helps):
http://www.wiener-d.com/ms-xpci.htm
and
http://www.egginc.com/Inst-138/MCS.htm
EG&G Ortec
100 Midland Road
Oak Ridge, TN 37830
Tel: (615) 482-4411
Telex: 55-7450
We are currently using an EG&G ISA MCS with Windows 3.1 (this hasn't
been bumped to the RT-Linux system yet, and that probably won't happen
during my time here, as I'm leaving next week).
-Don
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