[time-nuts] NPR Story I heard this morning
xaos at darksmile.net
Mon Nov 3 13:16:22 EST 2014
Why Strontium over Caesium?
Is it because it just sounds more hi-tech ? LOL
Maybe stupid question to most here, but I do
not know the answer.
On 11/03/2014 12:59 PM, Chris Albertson wrote:
> On Mon, Nov 3, 2014 at 8:17 AM, xaos <xaos at darksmile.net> wrote:
>> Small correction: The numbers were 10E-16.
> No I think it was "one part in 10E16" ;) But the interesting thing was
> they used numbers rather then saying something like "really super ultra
> But you are right, no two clocks will ever agree at that level because they
> will experience different gravitational fields. At this level the reason
> to have a clock is no longer to tell time. It is to measure the
> gravitational field. With an array of many clocks like these we might be
> able to map the density of the interior of the earth or detect black holes
> or who knows what. I think it opens up a new area of observation. When
> ever this happens we discover things we never would have thought of. Maybe
> in 40 years these Strontium oscillators will be mass produced for $2 each.
> Does anyone know how much "g" changes per cm of altitude? I'm to lazy to
> figure it out.
>> One important concept that was discussed was this:
>> If the next generation clock was even more accurate
>> (maybe by an order or two), then no two clocks
>> can ever agree on the time.
>> Minute changes in gravity and other factors will
>> always make each clock completely different.
>> So, to that I said: WOW! Wait just a damn minute.
>> I got into this so I can tell time precisely. Now I'm back
>> to to the beginning.
>> I know I am exaggerating a bit here but still.
>> On 11/03/2014 11:09 AM, Chris Albertson wrote:
>>> Yes, A story about time and frequency standards. They actually used
>>> numbers like 10E16 in the story. Apparently at that level your clock can
>>> measure a change in elevation of a few centimeters because of the
>>> relativistic effects of the reduced gravity field in just a few cm.
>>> On Mon, Nov 3, 2014 at 6:28 AM, xaos <xaos at darksmile.net> wrote:
>>>> This morning, as I was driving to work,
>>>> I heard this really cool story on NPR radio here in NYC.
>>>> This is the link to the story:
>>>> What a nice way to start the week.
>>>> Past stories with similar headlines.
>>>> George Hrysanthopoulos, N2FGX
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