Hi Geoff and list,
Thanks for the ideas, it is the very think-tank nature of these exchanges
that can trigger fresh ideas. In this case it was the mention of a spring
and types of spring that made me think of a vacuum, and then water
barometer. A quick Google and I found that 34 foot is about the length of
the column of water required. As it happens my floor level to water surface
is about 10 metres which would about do it!
I would then need to monitor the water level at the top of the water
barometer. What do you think? at the very least I would get warning of
changes in the weather!
Regards,
Andy

On 10 November 2010 04:45, Geoffrey  wrote:

> I've always thought optical might be the best way to go
> but everyone seems to resist that idea for one reason
> or another.
>
> A mirror at the pivot point with a small radius
> not sure, but mechanical amplification
> looks possible with a laser.
>
> I'm just not smart enough to figure it all out.
>
> Need a committee of scientists and engineers.
>
> Will anyone send a seismometer to
> Mars/Venus or ????
>
> Id like to see what they send if they do.
>
> I think the ladder should be 316 stainless steel.
>
> Regards,
> geoff
>
>
> -----Original Message----- From: Andrew Little
> Sent: Sunday, November 07, 2010 10:50 PM
>
> To: psnlist@..............
> Subject: Re: sensor in a well
>
> Thanks Geoff,
> There is an iron ladder down to the water's surface 10m. The house was
> built in 1923 and we are not keen climb down. I suppose I need to monitor
> the typical fluctuation in water level. Perhaps one of these laser measures
> as used for room dimensions would work, aimed at a suitable float. Once the
> seasonal variation is determined then a suitable sensor would have to
> operate over that range. If the movement is slight then a coil/magnet float
> might do the trick. If we are talking 50cm I think I need another solution.
> Perhaps optical?
> Andy
>
>
>
> On 7 November 2010 22:59, Geoffrey  wrote:
> Possibly float a magnet on the surface
> held in place by whatever and then
> have a coil on the wall of the well ?
>
> or, vice versa.
>
> getting the stuff into place is a big wonder.
>
> I often thought a big water tower might make a good
> vertical sensor if you hydraulically amplify
> the pressure changes related to ground motion.
> The water is a fluid and non-compressible
> with lots of mass and momentum, every tiny undulation should
> cause considerable pressure change.
>
> Sort of like a little pressure on the break pedal causes
> big pressure in the hydraulic cylinders.
>
> When I look at the water tower at Falcon Field
> at Mesa AZ, I often think of it as a potential seismometer.
>
> But such a thing must be dedicated only to sensing.
>
> Maybe a denser fluid like mercury ?
>
> A barometer like device that reacts to motion
> instead of air pressure.
>
> geoff
>
>
> -----Original Message----- From: Ted Channel
> Sent: Friday, November 05, 2010 6:02 PM
> To: psnlist@..............
> Subject: Re: sensor in a well
>
>
>
>
> Hi Andy,  Is it possible to email me a pdf or copy of the article....or a
> .jpg......very interesting.
> Ted
>
> ----- Original Message ----- From: Andrew Little
> To: psnlist@..............
> Sent: Friday, November 05, 2010 11:28 AM
> Subject: sensor in a well
>
> Hi PSN list,
> I have a copy of The Amateur Scientist by C.L. Strong 1960. It is a
> collection of projects and articles from The Scientific American. In the
> Earth Science section are several articles on seismology. It was this book
> that first got me interested in the subject. One article by Elmer Rexin
> describes using a float in a well to detect seismic events.
> I happen to have a well under my house, it is cut into the limestone, the
> water surface is 10 Metres below the floor of the cellar. I know of one
> sink-hole on the plateau above the village so It is possible that the well
> could be connected to an aquifer in the limestone hillside. The well in the
> article did have a connection to lake Michigan and so acted as part of a
> giant "U-tube".
> Anyway, the point of all this is to ask if anyone thinks there could be an
> advantage in setting up some form of sensor in the well, and if so, have you
> any ideas?
> Regards,
> Andy
>
>
>
>
> __________________________________________________________
>
> Public Seismic Network Mailing List (PSNLIST)
>
> To leave this list email PSNLIST-REQUEST@.............. with the body of
> the message (first line only): unsubscribe
> See http://www.seismicnet.com/maillist.html for more information.
>
>
>
>
>
> __________________________________________________________
>
> Public Seismic Network Mailing List (PSNLIST)
>
> To leave this list email PSNLIST-REQUEST@.............. with the body of
> the message (first line only): unsubscribe
> See http://www.seismicnet.com/maillist.html for more information.
>
Hi Geoff and list,
Thanks for the ideas, it is the very think-tank natur=
e of these exchanges that can trigger fresh ideas. In this case it was the =
mention of a spring and types of spring that made me think of a vacuum, and=
 then water barometer. A quick Google and I found that 34 foot is about the=
 length of the column of water required. As it happens my floor level to wa=
ter surface is about 10 metres which would about do it!

I would then need to monitor the water level at the top of the water barome=
ter. What do you think? at the very least I would get warning of changes in=
 the weather!
Regards,
Andy

On 10 N=
ovember 2010 04:45, Geoffrey <gmvoeth@...........> wrote:

I've always t=
hought optical might be the best way to go

but everyone seems to resist that idea for one reason

or another.



A mirror at the pivot point with a small radius

not sure, but mechanical amplification

looks possible with a laser.



I'm just not smart enough to figure it all out.



Need a committee of scientists and engineers.



Will anyone send a seismometer to

Mars/Venus or ????



Id like to see what they send if they do.



I think the ladder should be 316 stainless steel.



Regards,

geoff





-----Original Message----- From: Andrew Little

Sent: Sunday, November 07, 2010 10:50 PM
<=
br>
To: psnlist@web=
tronics.com

Subject: Re: sensor in a well



Thanks Geoff,

There is an iron ladder down to the water's surface 10m. The house was =
built in 1923 and we are not keen climb down. I suppose I need to monitor t=
he typical fluctuation in water level. Perhaps one of these laser measures =
as used for room dimensions would work, aimed at a suitable float. Once the=
 seasonal variation is determined then a suitable sensor would have to oper=
ate over that range. If the movement is slight then a coil/magnet float mig=
ht do the trick. If we are talking 50cm I think I need another solution. Pe=
rhaps optical?


Andy







On 7 November 2010 22:59, Geoffrey <gmvoeth@...........> wrote:

Possibly float a magnet on the surface

held in place by whatever and then

have a coil on the wall of the well ?



or, vice versa.



getting the stuff into place is a big wonder.



I often thought a big water tower might make a good

vertical sensor if you hydraulically amplify

the pressure changes related to ground motion.

The water is a fluid and non-compressible

with lots of mass and momentum, every tiny undulation should

cause considerable pressure change.



Sort of like a little pressure on the break pedal causes

big pressure in the hydraulic cylinders.



When I look at the water tower at Falcon Field

at Mesa AZ, I often think of it as a potential seismometer.



But such a thing must be dedicated only to sensing.



Maybe a denser fluid like mercury ?



A barometer like device that reacts to motion

instead of air pressure.



geoff





-----Original Message----- From: Ted Channel

Sent: Friday, November 05, 2010 6:02 PM

To: psnlist@web=
tronics.com

Subject: Re: sensor in a well









Hi Andy, =A0Is it possible to email me a pdf or copy of the article....or a=
 .jpg......very interesting.

Ted



----- Original Message ----- From: Andrew Little

To: psnlist@web=
tronics.com

Sent: Friday, November 05, 2010 11:28 AM

Subject: sensor in a well



Hi PSN list,

I have a copy of The Amateur Scientist by C.L. Strong 1960. It is a collect=
ion of projects and articles from The Scientific American. In the Earth Sci=
ence section are several articles on seismology. It was this book that firs=
t got me interested in the subject. One article by Elmer Rexin describes us=
ing a float in a well to detect seismic events.


I happen to have a well under my house, it is cut into the limestone, the w=
ater surface is 10 Metres below the floor of the cellar. I know of one sink=
-hole on the plateau above the village so It is possible that the well coul=
d be connected to an aquifer in the limestone hillside. The well in the art=
icle did have a connection to lake Michigan and so acted as part of a giant=
 "U-tube".


Anyway, the point of all this is to ask if anyone thinks there could be an =
advantage in setting up some form of sensor in the well, and if so, have yo=
u any ideas?

Regards,

Andy









__________________________________________________________



Public Seismic Network Mailing List (PSNLIST)



To leave this list email PSNLIST-REQUEST@.............. with the body of the m=
essage (first line only): unsubscribe

See h=
ttp://www.seismicnet.com/maillist.html for more information.











__________________________________________________________



Public Seismic Network Mailing List (PSNLIST)



To leave this list email PSNLIST-REQUEST@.............. with the body of the m=
essage (first line only): unsubscribe

See h=
ttp://www.seismicnet.com/maillist.html for more information.