C
Chris Carlen
- Jan 1, 1970
- 0
Hi:
Actually, we could use both a peak detector and integrator, for
different situations.
What is the feasibility of producing a peak detector that can output a
voltage proportional to the peak value of 4 ns FWHM pulses? This is the
lower limit on the width of the pulses we ma wish to detect. The signal
is from a PMT looking at laser induced incandescence. More typical
pulse widths would be 4-10 ns risetime to the peak, followed by a slow
decay of about 1us.
It is also sometimes desired to integrate this signal. How about the
feasibility of an accurate integrator at this time scale? Oh, it might
have to be gated as well, with 10-50ns gate widths. I know this is
doable, since we have lots of gated boxcar integrators around here.
Right now we are splitting the signal into 4 Tek scope channels, with
different gains on each to get resolution over a wide dynamic range.
Then the scope is dumped over GPIB and software finds the
peaks/integrals. Trouble is, the GPIB isn't fast enough. We are
looking at the Gage digitizing cards as as solution. These would
certainly work for both aspects, and are quite a flexible solution, but
expensive.
We figure an analog method would be much cheaper once developed, if
possible.
Is this doable, or would you just digitize? What if you *had* to do it
analog?
Comments appreciated.
Good day!
--
_______________________________________________________________________
Christopher R. Carlen
Principal Laser/Optical Technologist
Sandia National Laboratories CA USA
[email protected] -- NOTE: Remove "BOGUS" from email address to reply.
Actually, we could use both a peak detector and integrator, for
different situations.
What is the feasibility of producing a peak detector that can output a
voltage proportional to the peak value of 4 ns FWHM pulses? This is the
lower limit on the width of the pulses we ma wish to detect. The signal
is from a PMT looking at laser induced incandescence. More typical
pulse widths would be 4-10 ns risetime to the peak, followed by a slow
decay of about 1us.
It is also sometimes desired to integrate this signal. How about the
feasibility of an accurate integrator at this time scale? Oh, it might
have to be gated as well, with 10-50ns gate widths. I know this is
doable, since we have lots of gated boxcar integrators around here.
Right now we are splitting the signal into 4 Tek scope channels, with
different gains on each to get resolution over a wide dynamic range.
Then the scope is dumped over GPIB and software finds the
peaks/integrals. Trouble is, the GPIB isn't fast enough. We are
looking at the Gage digitizing cards as as solution. These would
certainly work for both aspects, and are quite a flexible solution, but
expensive.
We figure an analog method would be much cheaper once developed, if
possible.
Is this doable, or would you just digitize? What if you *had* to do it
analog?
Comments appreciated.
Good day!
--
_______________________________________________________________________
Christopher R. Carlen
Principal Laser/Optical Technologist
Sandia National Laboratories CA USA
[email protected] -- NOTE: Remove "BOGUS" from email address to reply.