Ultrasound

I think before you decide what platform to use, you need to figure out if this is even possible

From my understanding the answer is no to stopping it, you may be able to diffract it a bit but with a PI, probably not enough to even measure

Think of standing in a room with the light on, does it get darker when you turn on a the music up loud (Short of it blowing the house fuse )… no, ultrasound is only marginally higher frequency than audible compared to the frequency of light and is also a completely different wave type (Movement of Air vs movement of photons through air)

Now if the ultrasound was detected by something connected to a switch and it turned off the light then sure, but I suspect this is not what you want to achieve, it is the use of Ultrasound to directly block the light and that’s what I think is the part that wont work

Just my two pence worth

Another option would be to use the ultrasound to interfere with a surface that is transparent under normal conditions but when the sound wave hits it, it vibrates / changes its properties to go opaque ? this I could see as a plausible option though I do not know the materials you would need

Peter

On their own, sound waves cannot be used to block light.

That said, you can use certain crystal material that will go opaque if you hit it with ultrasound and block the light.

To go into any more detail we need to know the full requirements of your problem.

If you describe what you want to do we might be able to find an acceptable solution for you.

DAB

Hello DAB, thankyou for replying.
We hope to make a barrier using ultrasound, a cross section creation that is powerful enough to hold or keep some of the light in place, enough to see some kind of image or outline of instance of it working. I've read that ultrasound can be used to stop light. Saying that, The type or frequenc used wasnt mentioned. Only that ultrasound was used in an array type format. Another section of this topic I've read is the use of Non-reciprocal Brillouin scattering induced transparency which is used for controlling light propagation in a dielectric medium, and for producing slow and fast light, one of the mediums in order for this to work is the air around us. Is there a way of holding the light, even for a minute second using ultrasound in the ways specified above and how exactly would someone go about in doing this. If not, Is there a way of sustaining light in a the air without using fog or a Literal (in your face) material. http://www.nature.com/nphys/journal/vaop/ncurrent/full/nphys3236.html

AndAG

Ps. Bristol University | News | December: Haptic shapes using ultrasound - They've created shapes using ultrasound in the air (not vivible ones, touvhable ones) . We want to know that whether using a system similar to the array that is used on the example above, whether the scale is too small or not, can result in the theory becoming a reality.

Pps. We are also looking for people to help in our efforts and to work closely with us in the creation of this project, and other projects we have in mind. Thankyou for your time, once again.

Hello Peter, thanks for replying

What you're saying sound promising though, even if it would diffract it in the slightest. it would mean that it is working would it not? What platform would you suggest using in order to generate something close enough for a measurable reading.

Thankyou

Hi Mub,

If you want to produce a refraction barrier in air an intense low frequency sound wave will work better than an ultrasonic sound wave. Ultrasonic frequencies are quickly absorbed. Have you ever noticed how the bass of a passing car with sub woofers is all that you can hear and that you can hear it from a block away. Now while I doubt that it can actually be done let's assume that you can produce a refraction gradient in the air that is as high as a piece of glass. If your light hits the glass at 90 degrees it will pass through in a straight line. As the angle of incidence increases, the light will refract more and a portion will reflect from the boundary between the two different refraction indices. This of course will not stop the light as you wanted to do only divert it. Based on you original question and the lack of specifics it seems that the answer to your question is "no" you can not stop light with ultrasound.

John

hi everyone , thanks for ur help.

my questin my be generic, but what I wanna do is to hold light using ultrasound(raspberry pi or arduino).

once again thanks for ur help

cheers

Hi Mub,

Electromagnetic radiation only exists in the state of movement. If you try to hold it the light will be absorbed and change to longer and longer wavelengths diffusing into the environment.

John

Hi Andrew,

After looking at the paper they are changing the transparency of a material by setting up standing waves within the substance.

They are not technically catching light, per se, but just creating an optical switch.

As for holding light steady in free air, I doubt that it can be done.  That is why they use fog and manipulate the water molecules to create an image.

I do like the idea of a virtual touch and feel object created by the ultrasound device.  I can see why you want to combine the textural component with a visual one.

Have you considered using a viscous fluid?  You could use the ultrasonic energy to manipulate the free space shape of the fluid to provide the visual and textual result you are looking for.

I will consider you problem further to see if any ideas come to me later.

Please keep us appraised of your progress.  I can see some very interesting applications of this technology.

DAB

Thanks once again for replying to this thread. I understand what you're saying and see the potential problems that can arise from trying that. In addition to before. On a paper I read, scientists were able to create "Slow light" by using a crystal. Would it be possible to reflect hold diffract etc light of an ultrasonic array type formation. The aim being to sustain some form of image using dry everyday air as the medium for this. I'm also interested in the fluid method you described briefly, can you abbreviate more on that and possibly supply some links to readable sources, that viscous fluid method has peaked my interest.

Thank you again DAB and we will gladly keep you posted on anything that happens. Your insight is helpful and defiantly most welcome.

Yours AndAG

light can be redirected by IR, and very strong Low Freq, but ultrasound seems impossible.  Light itself can also act as a particle in behavior.