PSN-L Email List Message
Subject: Re: Another Homebrew Shackleford Gunderson Seismometer.
From: "Geoffrey" gmvoeth@...........
Date: Mon, 29 Mar 2010 17:52:45 -0700
At Arizona State University in the lobby of the Physics
building they had a unique seismometer from which you
had two sensors that could reproduce three dimensions
as a vectored results. There were two inverted pendulums
at a 45 degree vertical angle set at 90 degree horizontal
angle.
It seemed to be a short period device due to the small seize.
I think it would be worth analyzing this design
if anyone can find it to show everyone.
I would go down there personally to
photograph it for you guys
if it is still there and they will allow
me to do this.
Regards,
geoff
----- Original Message -----
From: "Glenn Durden"
To:
Sent: Monday, March 29, 2010 4:09 AM
Subject: Another Homebrew Shackleford Gunderson Seismometer.
> Hi.
> Been reading the mailing list archives for about a year now, and you guys
> have inspired me to build my own seismometer.
> Space is limited here, so a big Lehman (or two) was out of the question.
> After settling on the SG type of design, I thought
> that I'd try a double hinge that swings in both directions... and build two
> SG seismometers in the one box.
> Nobody else seems to have tried carbon fibre to reduce thermal expansion
> problems, so I thought I'd try that too.
>
> As you can see from the pictures, the project got out of hand. Etched
> brass labels, a stained wood cabinet, a big gauge
> with hand wound coils and even onboard audio for "alert! alert! alert!" if
> an earthquake is detected.
>
> Its only been running a short while and the software still cant save data,
> but it certainly seems sensitive enough to pick
> up every movement of my shaky 3rd floor block of flats. Simply walking
> into the room tilts the floor enough for an almost
> full scale reading.
>
> Opinions? Thoughts?
> http://www.brasswings.com/seis.html
>
> cheers...
> Glenn (Melbourne, Australia)
>
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