PSN-L Email List Message

Subject: Re: Finders Keepers ?
From: Larry Cochrane lcochrane@..............
Date: Fri, 13 Nov 2009 16:38:26 -0800

Geoffrey wrote:
> I have heard of two companies selling
> NEW velocity type sensors.
> One is somewhere in TEXAS selling the HS-10
> for like $3000 new down to 0.75Hz
> If lucky you will find one used.
> And another in PASADENA california selling a similar device.
> I really like the HS10 but not the price.
> As one of the little people $3000 may as well
> be $3,000,000 :-)
> The best alternative is to build your own or
> buy from a third party catering to educators.
> Im not sure Larry sells the geophone part
> but he does the electronics. Maybe he will
> include new technology like one of these MEMS
> thingys in the future ?

Not at $1800.00 each! Maybe someday when the price drops to under $300.00 in 
quantities of 100 or less.

> But Acceleration gives you an odd picture
> compared with velocity or actual displacement.
> I think you can use calculus in a program to convert between
> acceleration and other forms of the very same data
> but not sure. So like maybe you record acceleration
> then convert your data to whatever else.

One of the features in WinQuake is Integration. When you integrate data from an 
accelerometer you will get velocity and if you integrate once more you get displacement.

Larry Cochrane
Redwood City, PSN

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