PSN-L Email List Message

Subject: Re: geophone for urban search work
From: Bob Fryer bfryer@............
Date: Sun, 12 Aug 2001 20:55:08 -0700

Hello Rick,

Water departments have a rather simple device used to precisely locate
leaks before digging up a street.  I think they also call it a geo-phone.
It worked very well the only time that I used one.  Configuration was like
a giant stethoscope.  Didn't appear to have any electronics.


>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" 
>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 ( 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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Larry Cochrane <cochrane@..............>