PSN-L Email List Message
Subject: Re: Honduras Quake / geophones
From: "David Saum" DSaum@............
Date: Sat, 30 May 2009 18:49:19 -0400 (EDT)
> Subject: Re: Honduras Quake / geophones
> From: ChrisAtUpw@.......
> Date: Fri, 29 May 2009 14:33:09 EDT
> If you simply change your technology to Piezo sensors 102-1170-ND @
> $1.62 instead of 4.5 Hz geophones, you can do this fairly easily. You do
> need to make a suitable FET input amplifier; the piezo disk needs to be
> dry and at a fairly stable temperature. I use a honey jar with a metal
> lid, a moulded rubber seal and a sachet of silica gel. I stick a PCB disk
> soldered electrical feed through pins over a hole in the lid, using two
> part acrylic adhesive. The amplifier is mounted inside the lid of the
> jar, to
> keep it dry. The input impedance is about 50 M Ohms.
Sounds interesting in theory, but how well does it actually work?
Do you have any data/spectra from your piezo device that shows it
picks up teleseismic events as well as a my horizontal 4.5 Hz geophone?
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