PSN-L Email List Message

Subject: Re: AS-1 Type Sensor
From: Geoffrey gmvoeth@...........
Date: Mon, 24 Jan 2011 19:43:46 +0000


I understand Al has terrible temperature coefficients
and it would be better to have a welder
build you one out of steel ?.

But I do not know how badly a steel frame would effect the overall
results, being steel is magnetic ?.

Is there any non magnetic building material with excellent temperature coefficient ?

geoff




-----Original Message----- 
From: Ted
Sent: Monday, January 24, 2011 1:31 PM
To: psnlist@..............
Subject: Re: AS-1 Type Sensor


Hi Kay,   Please would you email me directly?   I have some questions about your AS1.   Great pdf file, thanks so much.
Ted.    tchannel@............

----- Original Message ----- 
From: Kay Wyatt
To: psnlist@..............
Sent: Sunday, January 23, 2011 3:01 PM
Subject: Re: AS-1 Type Sensor

Hi Richard,

Chris Chapman has provided considerable guidance to me and suggested two possible alternatives to the knife edge of the AS-1.

In the first example, he suggested clamping a standard razer blade to BOTH the horizontal arm and the vertical support.  The razer 
blade flexes very nicely with little friction.  Since I build seismometers for schools which sometimes have eager hands around them, 
I chose not to use a razer blade.  Even though the ends can be dulled, if the arm is bent too far it can snap and I was afraid of 
pieces flying off into eyes.

The second design that Chris suggested I thought was so clever it was close to magic.  It is hard to describe, so I just uploaded a 
PDF file that has the design drawings that I made for my seismometer.  The pivot mechanism is shown on page two of the PDF file. 
You can see from my work that it had strong influence from Chris Chapman who I consider to be my good friend.  Here is the link to 
the PDF file:

http://www.oregonshakes.com/temp/DesignDrawings4.pdf

Enjoy!
Kay Wyatt



----- Original Message ----- 
From: Richard Schneider
To: PSNLIST@..............
Sent: Sunday, January 23, 2011 11:54 AM
Subject: AS-1 Type Sensor

Hello PSN,

I would appreciate any comments regarding my AS-1 type sensor. It's close to the original design. I did not like the knife edge 
aluminum boom attached to a score mark in the aluminum mast, so I modified the boom to mast attachment. I am using two razor blades. 
One on the boom and one on the mast. Hardened steel on steel. Friction is much less. Free running oscillations have a much longer 
duration. Does anyone have a better suggestion? I would like to hear from you.

See my pic's here:  http://picasaweb.google.com/cfi2fly/MyPictures#

Also, Chris, if you read this, if I reversed the coil and magnet, would the effort be worth the results?

Thank you all,

Richard 

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