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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