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-   -   Planar driven by light ? (http://www.diyaudio.com/forums/planars-exotics/224383-planar-driven-light.html)

Thomas Spilcker 26th November 2012 07:26 PM

Planar driven by light ?
 
Just a ide ? You transform musik into a flashing light and on the membran / mylar is somthing light reakting on , so it vil move in harmoni with the light ? Then you will have a very light and free membran ! Thomas.

audioquestM-40 27th November 2012 12:37 AM

Light and electricity travel and nearly the same speed so fundamentally there may not be an advantage...unless one is perhaps more efficient and linear than the other...all ideas are worth exploring though

SEdwards 27th November 2012 06:25 AM

Hey Thomas,

Since light is an electromagnetic field, this is basically how electrostatics work. You have a fluctuating EM field and the electric charges react to it by moving back and forth.

oshifis 27th November 2012 11:30 AM

Quote:

Originally Posted by Thomas Spilcker (Post 3257918)
on the membran / mylar is somthing light reakting on

You mean a photon drive? Like the one commonly used in the spaceships (not currently, but in the distant future)? :rolleyes:

geraldfryjr 27th November 2012 11:48 AM

Quote:

Originally Posted by SEdwards (Post 3258600)
Hey Thomas,

Since light is an electromagnetic field, this is basically how electrostatics work. You have a fluctuating EM field and the electric charges react to it by moving back and forth.



ESL's do not work by magnetics or even electromagnetic forces for that matter.

They are strictly electrostatic!!

The diaphragm is moved by the differences of (voltages) static forces acting upon it.

Magnetism has know effect on them at all!!!

FWIW

jer :)

geraldfryjr 27th November 2012 12:16 PM

I used to have such discussions as this with a friend back in the mid 80's.

And some thing like this is now being done on an acoustical level using ultrasonic's with two modulated beams intersecting each other.

And the result of the two signals beating against each other results in excitation of the air at lower frequency's in the audible range at the point were the two beams intersect.
The result is the modulated signal.

My friend had this idea to do this with light waves, in which I understood him fully.

But my question to him is how would you transfer the force of the photons beating against each other to excite the molecules of the air in the same fashion.

If light is a electromagnetic wave than how do you excite the air with out a physical means.
The only other way I know how to do this is to use Heat or Plasama.

Light is at one frequency range and if the resonate frequency of the oxygen and nitrogen in the air is in this range it may be possible to do so but it would require a lot of power just to jiggle a few molecules.
And you have to have a lot of displacement to make some decent SPL's to be practical.

Cheers !!

jer :)

SEdwards 27th November 2012 12:46 PM

Hi jer,

Compared to the speed of light the changes in voltage are small enough that statics is a good approximation and no significant magnetic field is generated, I agree.

Electric and magnetic fields are different components of the same thing (the electromagnetic field strength tensor) though and distinguished only by the frame of reference. Photons are the force carrying particles for the electromagnetic field.

I only wanted to point out that all of these speaker techs are based on electric charges responding to light (changes in the the electromagnetic field) if you think about it from that point of view.

I'm a quantum physics grad student so I have my classical EM under control. Quantum physics will always be mysterious, however...

Quote:

Originally Posted by geraldfryjr (Post 3258891)
ESL's do not work by magnetics or even electromagnetic forces for that matter.

They are strictly electrostatic!!

The diaphragm is moved by the differences of (voltages) static forces acting upon it.

Magnetism has know effect on them at all!!!

FWIW

jer :)


geraldfryjr 27th November 2012 01:04 PM

Very cool, I never got that far into Physics.
But I try to follow as close as I can.
I try to follow quantum physics and mechanics but I haven't grasped the complete understanding of a lot of it yet.

jer :)

SEdwards 27th November 2012 01:11 PM

You could say that those who follow the path of physics academia have a lack of common sense and are pretty naive. Professors always encourage you to keep going but in the end there aren't enough jobs for everyone and we are cheap labor.

The good thing is that no one understands quantum physics, not really. But thinking about the fundamental questions doesn't help you to write papers. 'Shut up and calculate!' Once you have a Nobel prize you can think about it again...

alexberg 28th November 2012 12:09 AM

Quote:

Originally Posted by geraldfryjr (Post 3258909)

My friend had this idea to do this with light waves, in which I understood him fully.


Cheers !!

jer :)

You'll be blind and deaf at the power level required to create non-linearities in the air. For instance, when laser pulse makes snap noise in the air the power level is already tremendous


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