PSN-L Email List Message
Subject: Re: Signal To Noise Ratio of a Seismic Sensor
From: John Popelish jpopelish@........
Date: Sat, 25 Mar 2006 13:01:51 -0500
> just to clarify what I said about magnets, I've drawn a simple sketch:
You might crank the signal up a bit more by splitting that stack of
magnets in half, and clamping or gluing them on opposite sides of an
iron slug, with the magnets repelling each other at the attachment to
the slug. The slug should sit in the center of the coil.
The coil generates voltage in proportion to the flux that is passing
radially through the coil, and this arrangement crowds a lot more of
the flux in that direction. It also makes the total magnetic field
balanced, so that the Earth's magnetic field cannot push or pull on
the magnets as it changes. This reduces interference from things like
Your present design wasts a lot of flux that passes out the hole in
the coil and generates no signal. Making the change I am suggesting
might double your signal while reducing some sources of interference
and not increasing resistive noise at all.
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