On 8/25/16 8:12 PM, Bill Metzenthen wrote:
On 26/08/16 08:14, Hal Murray wrote:
billm...@gmail.com said:
If the conductor also has magnetic properties (e.g. if iron were
used) then
magnetic saturation could be an issue.
Ah... Sorry I wasn't clear. How about
Is skin depth an interesting
On 26/08/16 08:14, Hal Murray wrote:
billm...@gmail.com said:
If the conductor also has magnetic properties (e.g. if iron were used) then
magnetic saturation could be an issue.
Ah... Sorry I wasn't clear. How about
Is skin depth an interesting concept if you are using materials commonly
frequency measurement"
<time-nuts@febo.com>
Cc: <mag...@rubidium.se>
Sent: Wednesday, August 24, 2016 11:06 AM
Subject: Re: [time-nuts] Optical link connects atomic clocks over 1400 km of
fibre
Don't over-interpret the 50 Hz aspect, I don't remember those details from
4.5 mon
to shield against DC and low frequency magnetic field usually high
permeability magnetizable material -- Permalloy, Mu-metal or similar is
used, the field concentrates in the high permeability material and
"behind it" is no left over magnetic field
73
Alex
On 8/25/2016 11:10 AM, Magnus
billm...@gmail.com said:
> If the conductor also has magnetic properties (e.g. if iron were used) then
> magnetic saturation could be an issue.
Ah... Sorry I wasn't clear. How about
Is skin depth an interesting concept if you are using materials commonly used
for magnetic shielding, for
On 26/08/16 06:33, Hal Murray wrote:
billm...@gmail.com said:
Skin depth is probably a good place to start with in roughly estimating the
thickness needed. In copper at 50 Hz, ...
Is skin depth an appropriate concept for magnetic shielding? Or does it get
messed up by saturation?
Skin
billm...@gmail.com said:
> Skin depth is probably a good place to start with in roughly estimating the
> thickness needed. In copper at 50 Hz, ...
Is skin depth an appropriate concept for magnetic shielding? Or does it get
messed up by saturation?
--
These are my opinions. I hate spam.
Hi,
On 08/25/2016 11:04 AM, Bill Metzenthen wrote:
On 25/08/16 18:25, Poul-Henning Kamp wrote:
In message
<1057836989.2088307.1472104857885.javamail.ya...@mail.yahoo.com>, Br
uce Griffiths writes:
You'd need a rather thick copper jacket to shield effectively
against the 50Hz
On 25/08/16 18:25, Poul-Henning Kamp wrote:
In message <1057836989.2088307.1472104857885.javamail.ya...@mail.yahoo.com>, Br
uce Griffiths writes:
You'd need a rather thick copper jacket to shield effectively
against the 50Hz magnetic field.
As in: A good-sized fraction of the
Hi
There is also the minor issue of putting the (very thick) layers on in a spiral
around the "core". You put one layer on clockwise and the next counter
clockwise. Since the materials are quite springy, controlling the whole process
through heat treating is a real chore.
Bob
> On Aug 25,
Bruce wrote:
As long as you don't saturate it, bend it, hit it or drop it.
And that is AFTER you form it to shape and then anneal it in a Hydrogen
atmosphere.
You may (probably would) need several layers, perhaps of different
high-permeability alloys, with a thick outermost layer of soft
In message <1057836989.2088307.1472104857885.javamail.ya...@mail.yahoo.com>, Br
uce Griffiths writes:
>You'd need a rather thick copper jacket to shield effectively
>against the 50Hz magnetic field.
As in: A good-sized fraction of the wavelength if I recall :-)
Electric fields are so
t; >>
>> >> I do not know if optical fibers are even slightly antiferromagnetic
>> >> but maybe doping can make them susceptible?
>> >>
>> >>> On Wed, 24 Aug 2016 09:31:57 +1200, you wrote:
>> >>>
>> >>> W
a.org/wiki/Magnetostriction
>> >> https://en.wikipedia.org/wiki/Piezomagnetism
>> >>
>> >> I do not know if optical fibers are even slightly antiferromagnetic
>> >> but maybe doping can make them susceptible?
>> >>
>> >>> On Wed, 2
ving rise to the 50Hz
disturbance?
> >>> DaveB, NZ
> >>>
> >>> - Original Message -
> >>> From: "Magnus Danielson" <mag...@rubidium.dyndns.org>
> >>> To: <time-nuts@febo.com>
> >>> Cc: <mag...@ru
ble?
>>
>>> On Wed, 24 Aug 2016 09:31:57 +1200, you wrote:
>>>
>>> What is the coupling mechanism giving rise to the 50Hz disturbance?
>>> DaveB, NZ
>>>
>>> ----- Original Message -
>>> From: "Magnus Danielson
to the 50Hz disturbance?
DaveB, NZ
- Original Message -
From: "Magnus Danielson" <mag...@rubidium.dyndns.org>
To: <time-nuts@febo.com>
Cc: <mag...@rubidium.se>
Sent: Wednesday, August 24, 2016 8:54 AM
Subject: Re: [time-nuts] Optical link connects atomic
t;From: "Magnus Danielson" <mag...@rubidium.dyndns.org>
>To: <time-nuts@febo.com>
>Cc: <mag...@rubidium.se>
>Sent: Wednesday, August 24, 2016 8:54 AM
>Subject: Re: [time-nuts] Optical link connects atomic clocks over 1400 km of
>fibre
>
>> ...
>>
to the 50Hz disturbance?
DaveB, NZ
- Original Message - From: "Magnus Danielson"
<mag...@rubidium.dyndns.org>
To: <time-nuts@febo.com>
Cc: <mag...@rubidium.se>
Sent: Wednesday, August 24, 2016 8:54 AM
Subject: Re: [time-nuts] Optical link connects atomic
tract...@ihug.co.nz said:
> What is the coupling mechanism giving rise to the 50Hz disturbance?
My guess would be mechanical. Maybe from a nearby transformer.
--
These are my opinions. I hate spam.
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time-nuts mailing list --
Re: [time-nuts] Optical link connects atomic clocks over 1400 km of
fibre
The presentations and posters at 8FSM and EFTF York have been interesting.
The PTB link-end is even more stable than the clock, but only in frequency
stability.
More links is planned, among those between LNE-SYRTE a
The presentations and posters at 8FSM and EFTF York have been
interesting. The PTB link-end is even more stable than the clock, but
only in frequency stability.
More links is planned, among those between LNE-SYRTE at Paris
Observatory and NPL outside London. Such links aid in the comparison
Some interesting developments in european atomic clocks.
http://physicsworld.com/cws/article/news/2016/aug/22/optical-link-connects-atomic-clocks-over-1400-nbsp-km-of-fibre
http://www.nature.com/articles/ncomms12443
The time kept by atomic clocks in France and Germany has been compared
for the
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