Sujet : Re: Strings that can vibrate forever (almost)
De : jeroen (at) *nospam* nospam.please (Jeroen Belleman)
Groupes : sci.electronics.designDate : 25. May 2024, 10:36:43
Autres entêtes
Organisation : A noiseless patient Spider
Message-ID : <v2s7r2$2q1o9$1@dont-email.me>
References : 1 2 3
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On 5/25/24 07:04, Jan Panteltje wrote:
On a sunny day (Thu, 23 May 2024 11:04:02 +0200) it happened Jeroen Belleman
<jeroen@nospam.please> wrote in <v2n0m9$1m371$2@dont-email.me>:
On 5/23/24 07:08, Jan Panteltje wrote:
Strings that can vibrate forever (kind of)
https://www.sciencedaily.com/releases/2024/05/240522130402.htm
Source:
Delft University of Technology
Summary:
Researchers have engineered string-like resonators capable of vibrating longer at ambient temperature
than any previously known solid-state object -- approaching what is currently only achievable near absolute zero
temperatures.
Their study pushes the edge of nanotechnology and machine learning to make some of the world's most sensitive mechanical
sensors.
>
Interesting for inertial navigation!
>
Mechanical 214 kHz resonator with a Q of 6.6 billion at room temperature
see paper:
https://www.nature.com/articles/s41467-024-48183-7
figure 4
>
Interesting, indeed, but this looks *very* fragile!
Yes, but maybe not enough free space to move so much it breaks?
As I understand it, if a string touches something, it tends to stick.
That was one of the problems that caused low yields in early devices.
I just hope they used a Faraday cage and kept it away from other sources and their harmonics in the 214 kHz range.
Wallwarts! bats? some other piezo stuff.
With a Q > 1e9, coupling to outside influences is by definition
very weak. I don't see this thing becoming important as a low
noise oscillator element though. Pity. Maybe it's useful as a
precision thermometer.
Jeroen Belleman