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Registered Member #29
Joined: Fri Feb 03 2006, 09:00AM
Location: Hasselt, Belgium
Posts: 500
Excellent observation radiotech. The wave does indeed carry angular momentum. As a result, there will be a "twisting" effect on the dish as a result of the reaction torque (as well as a reaction force) on the dish as a result of radiation pressure on the dish. The effect is _VERY_ small tho'.
Registered Member #29
Joined: Fri Feb 03 2006, 09:00AM
Location: Hasselt, Belgium
Posts: 500
The force exerted on the vanes of the Crooke's radiometer is dominated by the thermodynamic effects of the gas particles striking the vanes. In fact, shining light on the radiometer causes the vanes to rotate in the _wrong_ direction, if radiation pressure was assumed to be the cause. (Rotates with black sides trailing. If radiation pressure was the cause, the white sides would trail.)
Radiometers rotate in the 'right' direction if sufficiently evacuated but with much less torque.
I'm with Steve, I think these guys are selling snake oil. They have a basis set that is only orthogonal for short distance on axis communication. It's a neat solution to a problem nobody has.
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BBC: 'Twisted' waves could boost capacity of wi-fi and TV
