Search found 36 matches

by Chris Mullins
Thu Sep 05, 2019 1:20 am
Forum: Announcements and Site Administration Topics
Topic: Any chance of an off-topic or non-fusion forum?
Replies: 12
Views: 838

Re: Any chance of an off-topic or non-fusion forum?

It would be interesting to have a subforum that could cover DIY/home-built particle beam systems, ultra high vacuum, plasma physics, ion propulsion (e.g. mentioned here by Michael Bretti), sputtering, etc., hidden if not logged in. The existing site seems so clean and on-point that it's easy to visu...
by Chris Mullins
Sat May 18, 2019 6:18 pm
Forum: Announcements and Site Administration Topics
Topic: Joe Gayo's Lab Tour
Replies: 15
Views: 7456

Re: Joe Gayo's Lab Tour

I'd be interested.
by Chris Mullins
Thu Feb 07, 2019 3:48 am
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Spectrum Recorder PCI-E Card?
Replies: 39
Views: 12390

Re: Spectrum Recorder PCI-E Card?

Harald,

To be clear, my suggestions (and background) are centered around the digital signal processing and sampling ideas, not the underlying radiation/detector physics, or real-world PMT counter applications - I don't have much experience in that. Others have given good advice there.
by Chris Mullins
Tue Feb 05, 2019 1:19 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Spectrum Recorder PCI-E Card?
Replies: 39
Views: 12390

Re: Spectrum Recorder PCI-E Card?

Harald, The sampled signal doesn't have to be periodic, just bandlimited. E.g. see here: https://www.maximintegrated.com/en/app-notes/index.mvp/id/3628 . The reconstruction is the same, using the sinc function like Rich already mentioned. Try searching on "reconstruction filter" to learn more about ...
by Chris Mullins
Sun Feb 03, 2019 5:13 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Spectrum Recorder PCI-E Card?
Replies: 39
Views: 12390

Re: Spectrum Recorder PCI-E Card?

Harald, Focusing on just a couple small issues in this response - I think there are still some large terminology gaps causing some misunderstanding. In the US, a "spectrum analyzer" is a specific tool used mostly for RF work in the frequency domain. None of the hits in your ebay search for "spectrum...
by Chris Mullins
Fri Feb 01, 2019 11:48 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Spectrum Recorder PCI-E Card?
Replies: 39
Views: 12390

Re: Spectrum Recorder PCI-E Card?

Harald, I'm not sure those deconvolution functions in R are what you are looking for. If the pulse shape is dominated more by the impulse response of the amplifier, then if you know the amplifier transfer function you can undo the time-domain effect of the amp by a deconvolution , which can be done ...
by Chris Mullins
Sun Jan 27, 2019 1:20 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Spectrum Recorder PCI-E Card?
Replies: 39
Views: 12390

Re: Spectrum Recorder PCI-E Card?

Harald, Most of the devices from your ebay search are audio A/D devices, sampling at 192 kHz. I don't think you understand how extreme 16 bits at 5 Gsamples/sec is with the current state of the art. I doubt ANYONE makes something with those specs, at ANY price, at least not as an off-the-shelf produ...
by Chris Mullins
Sat Jan 26, 2019 5:09 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Spectrum Recorder PCI-E Card?
Replies: 39
Views: 12390

Re: Spectrum Recorder PCI-E Card?

5 Gsamples/sec at 16 bits is extremely high performance - I'm not sure you'd find something like that off the shelf at any price. Here's one source of more "reasonable" PCIe boards: http://ultraviewcorp.com/displayproduct.php?cat_id=1 , they have a 12-bit 2Gsample/sec board: http://ultraviewcorp.com...
by Chris Mullins
Sun Jan 20, 2019 2:54 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Integrated Lab Measuring and Controlling (Labview, Labjack, ...)
Replies: 38
Views: 12061

Re: Integrated Lab Measuring and Controlling (Labview, Labjack, ...)

Well, "future-proof" and "PC-based" are two terms that don't really go together in general, unless you're willing to lock down the PC once things are working (no OS upgrades, no changing PC hardware, not networked, etc.) Speaking generally for long-lived systems, it's best to avoid consumer hardware...
by Chris Mullins
Sat Jan 19, 2019 8:33 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Integrated Lab Measuring and Controlling (Labview, Labjack, ...)
Replies: 38
Views: 12061

Re: Integrated Lab Measuring and Controlling (Labview, Labjack, ...)

Sorry, I may not have been clear earlier. With USB, one side of the interface is the host , and the other is the peripheral . The host is the PC, and the peripheral is the device connected to the PC (e.g. a scope). Technically there is a provision for swapping these roles, but it's not common. There...