The bandwidth of the laser is not narrow. It’s actually fairly wide, certainly not monochromatic. As is the photodetector bandwidth. That’s why red scattered laser light gets into the detector. Neither one is monochromatic. And that’s precisely why the CD laser appears RED even though it’s wavelength is 760 nm. Which is invisible. Hel-loo! I must be smarter than those other people you’re listening to. You’re following the wrong sheep.
What's the deal with coloring CD's and/or tray mechanism
I just stumbled across an old thread discussing this process, and the sonic advantages. It's intriguing, and I wonder what other members think. I am primarily into vinyl, and don't listen to cd's that often, but if I can improve the audio quality, then I am interested, to say the least.
I am concerned though, about painting the tray of my McIntosh, for fear of damage, and also de-valuing it's re-sale value
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As I explained earlier - spilled light would appear as mostly red but it shows as white (no red at all), because all camera sensors can see infrared and filters are not able to filter it completely. If you cannot understand it I cannot help it. Also LED transmitters have narrow band, like this one: http://www.vishay.com/docs/81009/tsal6100.pdf As you can see there is no light emitted below 840nm (Fig. 8) while visible light ends at 750nm. If you compare two cameras one with the film and another with digital sensor set to the same sensitivity you’ll find that infrared won’t be visible on the picture made with film camera but will show as white light on the one with digital sensor. It is not because of "spilled" light but because digital sensor is sensitive to infrared and film isn’t. I’m not sure if your understanding of this is as poor as one of the class D amps, but it is getting close. No sense to discuss it any further. |
kijanki "As I explained earlier - spilled light would appear as mostly red but it shows as white (no red at all), because all camera sensors can see infrared and filters are not able to filter it completely. If you cannot understand it I cannot help it. Also LED transmitters have narrow band, like this one: http://www.vishay.com/docs/81009/tsal6100.pdf As you can see there is no light emitted below 840nm (Fig. 8) while visible light ends at 750nm. If you compare two cameras one with the film and another with digital sensor set to the same sensitivity you’ll find that infrared won’t be visible on the picture made with film camera but will show as white light on the one with digital sensor. It is not because of "spilled" light but because digital sensor is sensitive to infrared and film isn’t. I’m not sure if your understanding of this is as poor as one of the class D amps, but it is getting close. No sense to discuss it any further." We are not on the same page. Not even close. I define infrared light as above 700 nm. Therefore if there is red in the CD laser light it MUST be because the 760 nm nominal wavelength is NOT monochromatic. It has SOME RED light in it. And that RED LIGHT has wavelenths BELOW 700 nm since that is where visible light ENDS. This conversation can serve no purpose anymore. |
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