PSN-L Email List Message

Subject: Re: Magnetic Phono Cartridge as a Seismic Velocity sensor ?
From: Matt Zieleman matthew.zieleman@.........
Date: Wed, 12 May 2010 08:38:29 -0700


I believe this is called an optical lever.

On Wed, May 12, 2010 at 8:31 AM, Geoffrey  wrote:

> Back to the light thingy,
> Given A Mass and Spring:
> It Seems To Me You might get
> X1000 magnification of motion
> by putting a light source with a small radius
> fixed to a stationary location connected to the mass and then
> like 50 to 100 feet more away sensing
> the lights motion.
> It all has to do with the fact that as the radius increases
> so does the velocity at the perimeter.
> And if you can bounce the light beam between two mirrors
> It might travel 100 feet in a relatively small space.
> It will not matter that light is only 400 to 800 angstrums ??(not sure of
> spelling)
> because one nano meter at the source becomes one micro meter
> at its destination, and, like light has no mass ??
>
> Have you ever seen such a mechanically amplified sensor before ?
>
I believe this is called an optical lever.

On Wed, May 12, 2010 at 8:31 AM, Geoffrey <gmvoeth@...........> wrote:
Back to the light thingy,
Given A Mass and Spring:
It Seems To Me You might get
X1000 magnification of motion
by putting a light source with a small radius
fixed to a stationary location connected to the mass and then
like 50 to 100 feet more away sensing
the lights motion.
It all has to do with the fact that as the radius increases
so does the velocity at the perimeter.
And if you can bounce the light beam between two mirrors
It might travel 100 feet in a relatively small space.
It will not matter that light is only 400 to 800 angstrums ??(not sure of spelling)
because one nano meter at the source becomes one micro meter
at its destination, and, like light has no mass ??

Have you ever seen such a mechanically amplified sensor before ?

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