I increased the s/n ratio by getting those small cubic super magnets, 
arranging them in a column and have them sit inside the core of the 
pickup coil.  They move with the arm of the Lehman sensor (being 
attached to it).

Ian

Geoffrey wrote:

> Hello PSN:
>
> Can someone out there run down a list of
> best ways to increase the signal to noise
> ratio of a seismic sensor ?
>
> Things like:
> 1. in a mass spring system use a larger mass
> 2. use a phased array
> 3. use low resistance's in the circuitry
> 4. use a narrow bandwidth
> 5. use a high Q
> 6. shield everything against anything not a seismic signal.
> 7. a high signal to noise ratio is not possible for the average 
> amateur due to cost
>   it might take a bunch of amatures to pool their monies and talents to
>   create a decent seismic sensor, possibly such a thing is only possible
>   at a university where both money and talent exists.
>
> Does any know of a system out there with the
> highest signal to noise ratio...if so can we see it ?
>
> More then likely it is in military hands
> and is secret ?
>
> In all the discussions I have seen in this group
> none seem to concentrate on signal to noise ratio.
>
> Sincerely;
> gmvoeth
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