RF Orbital Angular Momentum: March 2011

Researchers are continuing to find new ways to use RF spectrum more efficiently.

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I believe that OAM may have some unique applications in RF signaling especially for new multi-spectral coding techniques, search for SETI and in the remote detection of bombs, land mines and IEDs.

By combining RF OAM with Nuclear Quadrapole Resonance (NQR) it may be possible to overcome many of the limitations of NQR at the moment for detecting explosives. NQR produces a very weak signal that happens to be in the RF bands of commercial broadcasting. So remote (or even close proximity detection) is a real challenge. The attraction of OAM is the possibility of detecting NQR response to OAM modulated signals at a distance through spatial filtering of the response signal to elminiate common RF interference. Also OAM appears to have no limit to "modulation" power i.e the OAM can be made powerful enough to even create physical resonance as for example the "optical spammer" noted in some of the OAM research. Other resonance stimulation may be possible such as rapidly changing the direction and polarity of the OAM. "Pumping" the NQR sensitive molecules into higher circular vibrational modes with OAM resonance can also be used to enable a secondary OAM RF signal to absorbed, emitted or cross modulated in the detection process. The use of such techniques might enable to detection of explosives at a distance and conceivably even be used to disable explosive devices. This includes atomic bombs which need to use a conventional explosive to ignite the fission core.

An excellent overview of OAM can be found at:
http://www.physics.irfu.se/Publications/Presentations/ThideEtBergman%3ACSC_SETI%3A2008.pdf

RF Orbital Angular Momentum

Friday, March 11, 2011

Vorticity Transmission Could Increase Spectrum Efficiency

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