Rick,

I'm not sure if a geophone would be good for this type of thing,
maybe....I'm CCing the PSN mailing list. Maybe someone on the list has some
ideas for you.

PSN'ers, please CC Rick at seadog@....... since he is not on the list.

-Larry Cochrane
Redwood City, PSN


----- Original Message -----
From: "Rick Howard" 
To: 
Sent: Sunday, August 12, 2001 12:43 AM
Subject: geophone for urban search work


> Larry,
>
> Please advise whether you feel a geophone like the Mark
> Products L10B you have for sale might prove useful as
> a device to detect a person tapping on a collapsed structure
> when buried under rubble.
>
> I'm a Technical Search Specialist for one of the FEMA
> Urban Search & Rescue Task Forces, and we use a
> sophisticated device (http://www.delsar.com) as a person
> locator, but this equipment is expensive and limited as
> far as access for training.  How might a geophone work as
> as a detector if someone was tapping on a structure (pipe,
> concrete, etc) 20-100 feet away?  The general frequency
> range the Delsar unit calls for is 1-3000 Hz.  I'd love
> to buy a geophone to experiment with.  I can solder circuits
> pretty well, if you can recommend a circuit to go with it.
>
> Any advice would be appreciated.  I serve in search and
> rescue as a volunteer; you'll incur no liability in
> giving me your recommendation - I'm just looking to
> experiment with other available, cheaper tools in a
> quest to do my search job better.
>
> Thanks -
>
> Rick Howard
> Tech Search Specialist
> California Task Force 3, Menlo Park
>
> ____________________________________________________________
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