Alexander,
check Del Mar site:
http://www.dmphotonics.com/Pulse_Picker/pulse_pickers.htm
System shown is for different application but delay generator and other
components might be of interest to you.
Best regards,
Sergey Egorov
Del Mar Photonics, Inc.
4119 Twilight Ridge
San Diego, CA 92130
tel: (858) 876-3133
fax: (858) 630-2376
[log in to unmask]
http://www.dmphotonics.com/
----- Original Message -----
From: "Alexander Mark Zolot" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Tuesday, May 22, 2007 12:01 PM
Subject: Follow up to pulse delay generator and pulsed valve inquiry
> This is a follow up to my earlier post about pulse delay generators and
> pulsed valves. Several people suggested that I summarize the responses for
> interested members of the list.
>
> I first want to thank all of the MDN community members who responded to my
> inquiry. I have not included your names on this summary, for the sake of
> privacy. (I have been contacted by at least one company that received my
> contact info from the original post.)
>
> Part 1: Digital Pulse Delay Generators:
>
> I received no feedback about the companies I originally inquired about,
> Highland Tech and Signal Recovery. This probably means they have not
> established a reputation (good or bad) in our field of research. However,
> they may be willing to lend a demo unit to a lab in order to win customer
> confidence. This may be worth considering if you have time to evaluate
> such a model, as their specs are an improvement over the SRS DG535.
>
> A number of people replied with comments about Berkeley Nucleonics
> Corporation (BNC). It turns out that this company is selling a rebadged
> product made by another company, Quantum Composers (QC). The BNC 565-8C is
> their most recent version, and is only subtly different from the QC 9518+.
> Notable features: 8 output channels with independent delay AND width, and
> price ~10% cheaper than an SRS DG535. However, this comes with a somewhat
> higher rms jitter, <400ps vs. 50ps for the SRS.
>
> Several responses mentioned a BNC device that was not capable of
> referencing one channel to any other. The BNC 555 seems to have had this
> problem, and has been replaced the 565, which provides this function.
>
> One reply included the following negative feedback about the BNC (& a
> related EG&G) pulser: 1. It's jitter is larger than specified. (This may
> have something to do with BNC, who specs the jitter at 250ps, though the
> manufacturer, Quantum Composers states that it is <400ps.) 2. The high
> impedance channels tend to burn out frequently. 3. The "divide by n"
> function behaves erratically, dividing by n on average but actually
> removing pulses "at random".
>
> That said, the sales rep at Quantum Composers was quite eager to win my
> business and assuage these concerns. He repeatedly offered to send me a
> demo for evaluation and seemed to be quite confident of the product. I
> found one group at CU that currently uses the QC pulsers, and are quite
> happy with their performance (with only ~100ns time resolution demands).
> This mirrors other responents' positive opinion of the BNC pulser.
>
> ------
>
> Part 2: Pulsed supersonic jet sources
>
> No respondents knew of any manufacturer of PZT actuated valves.
> Apparently, these continue to be available only by custom machining. It
> was suggested that a number of research groups join together and place a
> large custom order for custom valves. This listserve may be an ideal venue
> for such a group to form. Interested parties can contact me, and I will
> distribute contact info in a less public venue.
>
> Parker-Hannifin "general valves" and RM Jordan "Gentry" valves seem to be
> the only available pulsed gas valves on the market.
>
> -----
>
> Thanks again to all who replied. I hope this compilation is useful to the
> list users. I have attempted to present the content of the replies I
> received as faithfully as possible and do not endorse any of the
> commercial products in any way.
>
> -Alex Zolot
>
> Alexander Zolot
> [log in to unmask]
>
> Graduate Research Assistant
> JILA
> University of Colorado
> Campus Box 440
> Boulder, CO 80309
> LAB (303)492-1454
> FAX (303)492-5235
>
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>
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