Re:22-Year-Old Lidar Whiz Claims Breakthrough
by dheera on Tuesday May 23, 2017 @03:22PM
(#14404345)
Water does absorb infrared well but it's not because it has lower energy. Infrared is absorbed well due to the spectrum of vibrational transitions. Ultraviolet is also absorbed well, due to electronic transitions. There is a "window" in the visible light that is not absorbed well by many transitions.
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Re:22-Year-Old Lidar Whiz Claims Breakthrough
by eric_h on Tuesday May 23, 2017 @03:39PM
(#14404509)
> but it's not because it has lower energy...There is a "window" in the visible light
fair enough, I got my physics a bit wrong there, but I was under the impression that that window was in the blue/green part of the spectrum since I do know that water is good at blocking UV and even cosmic radiation.
I also know that it's good at blocking visible red, because if you go further than about 20-30 feet down on a sunny day and cut yourself, your blood looks green.
Is there an additional window in the infrared part of the spectrum that supports GP's point?