What is Digg?16 Comments
- thecolor11, on 10/12/2007, -0/+1Why not save yourself and use an IR LED. Their response is more linear, so AM comes out cleaner. Laser diodes are better with digital signals, because you can turn them on past the knee voltage and back off quickly.
- Jibberish, on 10/12/2007, -0/+1ocontinuum: People do not user lasers for communications because it is faster, they use lasers through Fiber Optics because you do not get any Electromagnetic interference of the signal (Visible Light is immune to 60Hz hum, transformers, lightning spikes, etc…), less attenuation of the signal characteristics over distance (signal goes further) compared to copper transmission media, and because the bandwidth offered by a single Fiber Optic cable is dramatically larger than that of it's copper predecessor. Last time I checked, Laser light and Radio waves are all forms of light constituting parts of the electromagnetic spectrum. All forms of light travel at 3x10^8 m/s through a vacuum. Fiber optics are a form of glass, when light hits a more dense material like glass it slows down and refracts the light (bends) so actually Radio signals propagate (move) faster than lasers through Fiber Optics because they propagate through a less dense medium like air.
- ocontinuum, on 10/12/2007, -0/+0ohh sht this is the guy i emailed concering the project smart dude
- amwmedia, on 10/12/2007, -0/+0why don't people use this same tech for computer networking? How cool would that be? Instead of buying a directional wireless ant, use lasers!
- ocontinuum, on 10/12/2007, -0/+0soo old did this for my 9th grade science fair project(im in 11th) won it of course
- tdkyo, on 10/12/2007, -0/+0Gonna do for my Physics project. :-)
- nugget, on 10/12/2007, -0/+0Very cool.
- jltyler, on 10/12/2007, -0/+0I remember doing something like this at a program at UofM like 7years ago. Back then we used a laser a razor blade and a reciever. It was about the laser diffraction.
- geetee, on 10/12/2007, -0/+0amwmedia: fiber optics
- Eddimond, on 10/12/2007, -0/+0also, Hax0r, to make the laser bounce off windows the angle of the laser, from the normal, has to be greater than the critical (usually between 40 and 50 in glass, it's dependant on the density of the glass), causing total internal reflection(this is how fibre optics work). Hope that helps.
- scotty6969, on 10/12/2007, -0/+0cool
- Eddimond, on 10/12/2007, -0/+0I know this is over a year old, but I just wanna say that Ocontinuum is wrong. Laser isn't faster than radio waves. Infact, all waves in the electro magnetic spectrum travle at the speed of light (300 000 000m/s).
- inactive, on 10/12/2007, -0/+0mirrors? :)
- inactive, on 10/12/2007, -0/+0Make magazine worthy
- hax0r, on 10/12/2007, -0/+0How can this be modified to bounce the laser off of a window to hear the sound from inside the room? I imagine you'd have to hit it at a very acute angle so you could catch the reflected beam.
- ocontinuum, on 10/12/2007, -0/+0people do use lasers for communication because it is faster then radio waves but it is to impractical except for somthin like building to building or town to town communication since they can go thru walls
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