#WaveGuide
Got pulled down a rabbit hole learning about Schumann resonances, which are electromagnetic wave resonances in the atmosphere because the area between the earth's surface and the ionosphere acts as a spherical waveguide. The energy input is from lightning, which is practically continuous (50 strikes/s) when viewed worldwide. The fundamental frequency involved is 7.83 Hz, with various weaker harmonics above that.
How I got pulled into the rabbit hole...
Of *course* people are selling woo / magic / New Age B.S. around this stuff. But I'm sorry to say, your little trace-printed-on-a-PCB antenna supposedly broadcasting on this frequency to boost its "natural healing properties" is not going to be an effective radiator at sub-8 Hz, even if you turn it into a spiral to make it longer. The wavelength of the 7.83 Hz fundamental is ~38,000 km, so a basic quarter-wave antenna should be >9000 km long...
Ars Technica probably has the deepest details on these ‘normal’ AR glasses appearing at this winters CES, RayNeo x3 Pro. They are $1500.
It would be nice to see a YouTube video of them in action if that’s possible. Not sure how you can manipulate the projection optics to focus that near to the eye. A focus ‘set up’ routine?
Does Wikipedia have an article on ‘waveguide’?
I love #Csound to create playable instruments. #PhysicalModelling is fun and Csound is so powerful here.
Here's my #Handpan instrument http://juliencoder.de/sound/handpan-3.0.zip
Here's the handpan in a complete Csound physically modelled band:
https://youtu.be/nnDppQ3tgfU
And here's the handpan in a #Pop song with other hard- and softsynths and vocals:
https://youtu.be/Q9ErBjaMTZM
#SoundDesign #Synthesis #Waveguide #Resonator #Music #Ambisonics
Mediocre #whisky , but very good packaging! Smokehead #cantenna #2_4GHz #wifi #bluetooth #waveguide #antenna
Have any of you folks encountered thus type Soviet waveguide relay before?
Looking for:
A pinout for the connector
A datasheet with the specs for driving it
Connector type.
This is X-band based on the waveguide dimensions.
The Waveguide Explanation You Wish You’d Had At School https://hackaday.com/2024/08/09/the-waveguide-explanation-you-wish-youd-had-at-school/ #transmissionline #RadioHacks #microwave #waveguide
The Waveguide Explanation You Wish You’d Had At School https://hackaday.com/2024/08/09/the-waveguide-explanation-you-wish-youd-had-at-school/ #transmissionline #RadioHacks #microwave #waveguide
The Waveguide Explanation You Wish You’d Had At School - Anyone who has done an electronic engineering qualification will at some point hav... - https://hackaday.com/2024/08/09/the-waveguide-explanation-you-wish-youd-had-at-school/ #transmissionline #radiohacks #microwave #waveguide
"The inherent stability of the #terahertz beat frequency between the signal and idler fields of an optical parametric oscillator is transferred to a microwave frequency of a Kerr #soliton comb, and synchronization is achieved via a coupling #waveguide without the need for electronic locking."
"We illustrate the potential of these concepts by fabricating #nanostructures that are impossible to make with any other known method: #waveguide-coupled high-Q silicon photonic cavities that confine telecom #photons to 2 nm air gaps with an aspect ratio of 100, corresponding to mode volumes more than 100 times below the #diffraction limit. Scanning transmission electron microscopy measurements confirm the ability to build devices with sub-nanometre dimensions."
A team of researchers has made a breakthrough discovery in the world of Beyond 5G/6G (B5G/6G) #signal #transmission. They have created a #waveguide made of #niobium that speeds up the transition of B5G/6G signals.
#Physics #Technology #sflorg
https://www.sflorg.com/2023/10/phy10102301.html
A strange piece of #RF #junk
There is a clear WR-90 #waveguide going into that shielded end of the thing.
Applications and Beyond
NIL's impact spans diverse fields:
•
Optics: #Lenses, #prisms, #waveguide couplers for #AR/#XR
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Nanotechnology: Custom nanostructures
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Biomedicine: Precise #diagnostics, point-of-care devices and lab-on-a-chip
Novel approach to control energy wave
Synthetic metamaterial directs mechanical waves along specific path
https://showme.missouri.edu/2023/scientists-create-novel-approach-to-control-energy-waves-in-4d
https://news.ycombinator.com/item?id=36996075
Creating synthetic spaces for higher-order topological sound transport
https://www.nature.com/articles/s41467-021-25305-z
Waveguide: https://en.wikipedia.org/wiki/Waveguide
Structure that guides waves e.g. sound, light, radio waves, other EM waves w. min. loss of E by restricting E transmission to 1 direction
"Here we show that a leaky oscillation with #anisotropic perturbation rather can achieve completely zero crosstalk realized by subwavelength grating (SWG) #metamaterials. The oscillating fields in the SWGs enable coupling coefficients in each direction to counteract each other, resulting in completely zero crosstalk."
Hah. Apparently I'm the #waveguide person these days.
"Hey I have these two large waveguide dummy loads, do you want them?"
And here they are.
#microwaves #surplus #junk
Referenced link: https://phys.org/news/2023-05-team-dynamically-trions-waveguide.html
Discuss on https://discu.eu/q/https://phys.org/news/2023-05-team-dynamically-trions-waveguide.html
Originally posted by Phys.org / @physorg_com: http://nitter.platypush.tech/physorg_com/status/1658128412999929856#m
Team manages to dynamically control trions with a #waveguide @postech2020 @NatureComms https://www.nature.com/articles/s41467-023-37481-1 https://phys.org/news/2023-05-team-dynamically-trions-waveguide.html