Strings that can vibrate forever (almost)

[Jan Panteltje]

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

[Jeroen Belleman]

Post by Jan Panteltje
Strings that can vibrate forever (kind of)
https://www.sciencedaily.com/releases/2024/05/240522130402.htm
Delft University of Technology
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
https://www.nature.com/articles/s41467-024-48183-7
figure 4

Interesting, indeed, but this looks *very* fragile!

Jeroen Belleman

[Jan Panteltje]

On a sunny day (Thu, 23 May 2024 11:04:02 +0200) it happened Jeroen Belleman

Post by Jeroen Belleman

Post by Jan Panteltje
Strings that can vibrate forever (kind of)
https://www.sciencedaily.com/releases/2024/05/240522130402.htm
Delft University of Technology
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
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?

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.

[Jeroen Belleman]

Post by Jan Panteltje
On a sunny day (Thu, 23 May 2024 11:04:02 +0200) it happened Jeroen Belleman

Post by Jeroen Belleman

Post by Jan Panteltje
Strings that can vibrate forever (kind of)
https://www.sciencedaily.com/releases/2024/05/240522130402.htm
Delft University of Technology
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
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.

Post by Jan Panteltje
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

[Phil Hobbs]

Post by Jeroen Belleman

Post by Jan Panteltje
On a sunny day (Thu, 23 May 2024 11:04:02 +0200) it happened Jeroen Belleman

Post by Jeroen Belleman

Post by Jan Panteltje
Strings that can vibrate forever (kind of)
https://www.sciencedaily.com/releases/2024/05/240522130402.htm
Delft University of Technology
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
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.

Post by Jan Panteltje
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

Possibly some sort of sensor.

Because the oscillation obeys a differential equation, while it takes Q
cycles to respond to external forcing,it responds instantly to any effect
that changes the mass or spring constant.

Cheers

Phil Hobbs

[john larkin]

Post by Jan Panteltje
Strings that can vibrate forever (kind of)
https://www.sciencedaily.com/releases/2024/05/240522130402.htm
Delft University of Technology
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
https://www.nature.com/articles/s41467-024-48183-7
figure 4

It might not have the stability or tempco of a quartz crystal. The SiN
string will surely have a different thermal expansion factor than the
silicon substrate.

It would be cool to have a worldwide (or even in space) array of
thousands of 3-axis gravitational wave detectors, instead of just
three single-axis sites. We could image g-waves at high resolution.

[Bill Sloman]

Post by john larkin

Post by Jan Panteltje
Strings that can vibrate forever (kind of)
https://www.sciencedaily.com/releases/2024/05/240522130402.htm
Delft University of Technology
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
https://www.nature.com/articles/s41467-024-48183-7
figure 4

It might not have the stability or tempco of a quartz crystal. The SiN
string will surely have a different thermal expansion factor than the
silicon substrate.
It would be cool to have a worldwide (or even in space) array of
thousands of 3-axis gravitational wave detectors, instead of just
three single-axis sites. We could image g-waves at high resolution.

It's a project in progress, but the projected launch date is currently
2035. I may survive long enough to see the launch.

https://en.wikipedia.org/wiki/Laser_Interferometer_Space_Antenna