Re: Strings that can vibrate forever (almost)

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