Rayleigh distance

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Rayleigh distance [′rā·lē ‚dis·təns]

(physics)

For electromagnetic, acoustic, or elastic waves emitted from a uniformly excited planar array transmitting a sinusoidal signal, the distance from the array at which there is a transition from a near-field region, in which the radiated energy is confined to a cylindrical region, to a far-field region, in which the wave field exhibits spherical spreading and the field amplitude varies inversely with range.

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