Prediction of spectral shifts proportional to source distances by time-varying frequency or wavelength selection

Details Prediction of spectral shifts proportional to source distances by time-varying frequency or wavelength selection Prediction of spectral shifts proportional to source distances by time-varying frequency or wavelength selection

2008-12-04

arxiv.org/abs/0812.1004v1

Proceedings of SPIE Volume 7057, Paper 7057-11, 2008

Physics

General Physics

15 pages, 10 figures. Nature of Light II: Light in Nature, SPIE Optics+Photonics, San Diego, Aug 2008

Scientific paper

Any frequency selective device with an ongoing drift will cause observed spectra to be variously and simultaneously scaled in proportion to their source distances. The reason is that detectors after the drifting selection will integrate instantaneous electric or magnetic field values from successive sinusoids, and these sinusoids would differ in both frequency and phase. Phase differences between frequencies are ordinarily irrelevant, and recalibration procedures at most correct for frequency differences. With drifting selection, however, each integrated field value comes from *the sinusoid of the instantaneously selected frequency at its instantaneous received phase*, hence the waveform constructed by the integration will follow the drifting selection with a phase acceleration given by the drift rate times the slope of the received phase spectrum. A phase acceleration is literally a frequency shift, and the phase spectrum slope of a received waveform is an asymptotic measure of the source distance, as the path delay presents phase offsets proportional to frequency times the distance, and eventually exceeding all initial phase differences. Tunable optics may soon be fast enough for realizing such shifts by Fourier switching, and could lead to pocket X-ray devices; sources continuously variable from RF to gamma rays; capacity multiplication with jamming and noise immunity in both fibre and radio channels, passive ranging from ground to deep space; etc.

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