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Author Topic: Is it possible to convert light energy into sound?  (Read 8701 times)

Namine

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Namine asked the Naked Scientists:
   
I have a question.

Is there any device or gadget created with can convert light into sound?

What do you think?
« Last Edit: 24/04/2010 22:30:02 by _system »


 

Offline yamo

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Is it possible to convert light energy into sound?
« Reply #1 on: 25/04/2010 09:14:43 »
a cd player?

sonoluminescence  converts sound into light...
 

Offline RD

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Is it possible to convert light energy into sound?
« Reply #2 on: 25/04/2010 10:01:43 »
Laser microphone ?

OK the laser microphone (and the CD player and optic fibre) do not convert light directly into sound:
they convert light into electricity, electricity into magnetism (loudspeaker), producing sound.


In photoacoustic imaging light produces heat which produces (ultra)sound ...

Quote
Photoacoustic imaging, as a hybrid biomedical imaging modality, is developed based on the photoacoustic effect. In photoacoustic imaging, non-ionizing laser pulses are delivered into biological tissues (when radio frequency pulses are used, the technology is referred to as thermoacoustic imaging). Some of the delivered energy will be absorbed and converted into heat, leading to transient thermoelastic expansion and thus wideband (e.g. MHz) ultrasonic  emission. The generated ultrasonic waves are then detected by ultrasonic transducers to form images.

http://en.wikipedia.org/wiki/Photoacoustic_imaging_in_biomedicine
« Last Edit: 25/04/2010 10:08:54 by RD »
 

Offline Geezer

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Is it possible to convert light energy into sound?
« Reply #3 on: 25/04/2010 21:06:21 »
A light bulb and a phototransistor works quite well. You can drive the light bulb from an audio amplifier so that the light output is modulated by the audio signal. Then you receive the light with the phototransistor and amplify it to reproduce the audio signal.

You could also replace the lightbulb with a couple of LEDs.
 

Offline RD

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Is it possible to convert light energy into sound?
« Reply #4 on: 25/04/2010 21:33:01 »
Photophone used modulated beam of sunlight to transmit sound ...

http://en.wikipedia.org/wiki/Photophone

Has the advantage that you can't be disturbed by a photophonecall in the middle of the night.  :)
« Last Edit: 26/04/2010 17:31:00 by RD »
 

The Naked Scientists Forum

Is it possible to convert light energy into sound?
« Reply #4 on: 25/04/2010 21:33:01 »

 

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