My actual application is as a quick cool demo showing what I can do with this gear in my garage when people go "why"?
:-) On 24 June 2013 09:22, Magnus Danielson <[email protected]> wrote: > Hi Jim, > > > On 06/24/2013 01:03 AM, Jim Palfreyman wrote: > >> Hi all, >> >> With a 3325B, a 5370B, and other time-nut miscellany, what's the quickest >> way you can come up with to measure the speed of light OR reproduce the >> metre. >> >> I've got some ideas, but I'd like others' thoughts. >> > > Using a laser that reflects and a detector, create a resonator, such that > the received signal is amplified and modulated on the laser. > The delay through the circuit needs to be calibrated, but once you have > done that, you remove it from the measured period of this oscillator, and > the remaining time will be the flight-time. Using a TIC like the 5370B you > can measure this period with a fairly high resolution, averaging and all. > Recall that the flight-time will for twice the distance. This setup isn't > perfect in many senses, but you can do it. > The 3325B might come handy in calibration. > > By intentionally insert extra delay (which we assume is stable and known) > you can reduce the range of frequency and hence phase shift variation > needed to be calibrated, which can increase the precision to some point. > > This is a rough method of doing it, but it may serve your needs > sufficiently good. I could probably hack this up with scraps lying around > my lab, possibly lacking the optics for the laser. > > What is your actual application? > > Cheers, > Magnus > ______________________________**_________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/** > mailman/listinfo/time-nuts<https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts> > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
