PSN-L Email List Message
Subject: Re: AS-1 Type Sensor
From: gpayton@.............
Date: Sun, 23 Jan 2011 16:15:50 -0600
AMEN on Chris! Excellent & Beautiful drawing. Do you have photos of =
finished instrument?
Jerry Payton
From: Kay Wyatt=20
Sent: Sunday, January 23, 2011 4:06 PM
To: psnlist@.................
Subject: Re: AS-1 Type Sensor
Bob,
I have a little more update to date information on the AS-1. You are =
correct that Jeff Batten passed away. His wife has been able to engage =
a friend who is an electrical/mechanical engineer into taking on Jeff's =
work. There is quite a bit of backlog in providing AS-1 seismometers to =
the IRIS Seismographs in Schools project http://www.iris.edu/hq/sis so =
he will be concentrating on that first. However, I am told by IRIS that =
he is planning on making improvements to Jeff's design and will be =
working on that as soon as he can catch up.
Chris Chapman has provided me with one of his period extending circuit =
designs which I am testing. Chris has been an invaluable resource to =
me. I am so glad that he is back online. What a resource he is!
Kay Wyatt
----- Original Message -----=20
From: Bob McClure=20
To: psnlist@.................
Sent: Sunday, January 23, 2011 1:18 PM
Subject: Re: AS-1 Type Sensor
It seems for now that anyone who wants an AS-1 sensor will have to =
build their own. Chris Chapman informed me that GeoffBatten =
unfortunately died a couple of months back and his widow does not seem =
to have found anyone to make more AS-1's. I do not know how hard it will =
be to obtain the BlackBox amplifier that is a vital part of the AS-1 =
system. Chris may be eventually able to supply us with a circuit diagram =
of an amplifier providing the necessary bass boost, but he is =
recuperating at his home in the Midlands, and presently unable to access =
his papers in his primary residence in Upwaltham. Meanwhile, my digital =
inverse filter, implemented in WQFilter.exe, can be helpful. Larry is =
working on coding this filter for use in WinQuake.
I want to remind all that the connections between the spring ends and =
the sensor are also flexure points, and deserve every bit as much =
attention to slip-stick friction and flat spots as the boom attachment. =
I have learned this from hard experience.
Bob
On Sun, Jan 23, 2011 at 2:54 PM, Richard Schneider =
wrote:
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
AMEN on Chris! Excellent & Beautiful drawing. Do =
you have=20
photos of finished instrument?
Jerry Payton
Sent: Sunday, January 23, 2011 4:06 PM
Subject: Re: AS-1 Type Sensor
Bob,
I have a little more update to date information =
on the=20
AS-1. You are correct that Jeff Batten passed away. His wife =
has=20
been able to engage a friend who is an electrical/mechanical engineer =
into=20
taking on Jeff's work. There is quite a bit of backlog in =
providing AS-1=20
seismometers to the IRIS Seismographs in Schools project http://www.iris.edu/hq/sis so he =
will be=20
concentrating on that first. However, I am told by IRIS that he is =
planning on making improvements to Jeff's design and will be working on =
that as=20
soon as he can catch up.
Chris Chapman has provided me with one of his =
period=20
extending circuit designs which I am testing. Chris has been an =
invaluable=20
resource to me. I am so glad that he is back online. What a =
resource=20
he is!
Kay Wyatt
----- Original Message -----
Sent: Sunday, January 23, 2011 =
1:18=20
PM
Subject: Re: AS-1 Type =
Sensor
It seems for now that anyone =
who wants=20
an AS-1 sensor will have to build their own. Chris Chapman informed me =
that=20
GeoffBatten unfortunately died a couple of months back and his widow =
does not=20
seem to have found anyone to make more AS-1's. I =
do not=20
know how hard it will be to obtain the BlackBox amplifier that is a =
vital part=20
of the AS-1 system. Chris may be eventually able to supply us with a =
circuit=20
diagram of an amplifier providing the necessary bass boost, but he is=20
recuperating at his home in the Midlands, and presently unable to =
access his=20
papers in his primary residence in Upwaltham. Meanwhile, my digital =
inverse=20
filter, implemented in WQFilter.exe, can be helpful. Larry is working =
on=20
coding this filter for use in WinQuake.
I want to remind all =
that the=20
connections between the spring ends and the sensor are also flexure =
points,=20
and deserve every bit as much attention to slip-stick friction and =
flat spots=20
as the boom attachment. I have learned this from hard=20
experience.
Bob
On Sun, Jan 23, 2011 at 2:54 PM, Richard =
Schneider=20
<cfi2fly@.........> =
wrote:
Hello PSN,
I would appreciate any comments regarding my AS-1 type sensor. =
It's=20
close to the original design. I did not like the knife edge aluminum =
boom=20
attached to a score mark in the aluminum mast, so I modified the =
boom to=20
mast attachment. I am using two razor blades. One on the boom and =
one on the=20
mast. Hardened steel on steel. Friction is much less. Free running=20
oscillations have a much longer duration. Does anyone have a better=20
suggestion? I would like to hear from you.
=
Also, Chris, if you read this, if I reversed the coil and =
magnet, would=20
the effort be worth the results?
Thank you all,
=
Richard
=
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