Correct me if I'm wrong, but I think that 1/4 wavelength for an He laser
would be less than the diameter of the fiber, not much of a stretch.

        Ron


ravakian wrote:

> As shown I can't see how there would be any sensitivity at all, but
> what about try stretching it out straight for a number of feet, say
> at least 1/4 wavelength?  Even then the big problem I see is the
> non-directionality of the device.  How do you tell horizontal from
> vertical motion and either from a sag of the cable due to towards and
> away motion?
>
> Bob Avakian
> Tulsa, OK
> ---- Original Message ----
> From: morris@.......
> To: psn-l@...............
> Subject: Re: laser seismograph
> Date: Tue, 6 Nov 2001 11:39:39 -0800
>
> >Let me know if you find any info on the laser seismo.
> >I have thought of using something like this.
> >
> >Ron Suttora  (Livermore)
> >morris@.......
> >----- Original Message -----
> >From: R&L Thompson 
> >To: PSN List 
> >Sent: Tuesday, November 06, 2001 11:04 AM
> >Subject: laser seismograph
> >
> >
> >> I'd appreciate comments regarding this seismograph design using a
> >laser.
> >>
> >> http://www.ece.orst.edu/~ece482/lasers/ee48894/leslie/lesprop.htm
> >>
> >> I'm unqualified to say much about it, but I'm doubtful that it
> >would be
> >> very sensitive.
> >>
> >>         Ron (in Gander)
> >>
> >>
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