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HandWiki. Precursor. Encyclopedia. Available online: https://encyclopedia.pub/entry/37730 (accessed on 12 November 2026).
HandWiki. Precursor. Encyclopedia. Available at: https://encyclopedia.pub/entry/37730. Accessed November 12, 2026.
HandWiki. "Precursor" Encyclopedia, https://encyclopedia.pub/entry/37730 (accessed November 12, 2026).
HandWiki. (2022, December 02). Precursor. In Encyclopedia. https://encyclopedia.pub/entry/37730
HandWiki. "Precursor." Encyclopedia. Web. 02 December, 2022.

Precursor

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The content is sourced from: https://handwiki.org/wiki/Physics:Precursor

Precursors are characteristic wave patterns caused by dispersion of an impulse's frequency components as it propagates through a medium. Classically, precursors precede the main signal, although in certain situations they may also follow it. Precursor phenomena exist for all types of waves, as their appearance is only predicated on the prominence of dispersion effects in a given mode of wave propagation. This non-specificity has been confirmed by the observation of precursor patterns in different types of electromagnetic radiation (microwaves, visible light, and terahertz radiation) as well as in fluid surface waves and seismic waves.

precursor dispersion classically

References

  1. See L. Brillouin, Wave Propagation and Group Velocity (Academic Press, New York, NY, 1960), Ch. 1.
  2. Pleshko, Peter; Palócz, István (1969-06-02). "Experimental Observation of Sommerfeld and Brillouin Precursors in the Microwave Domain". Physical Review Letters (American Physical Society (APS)) 22 (22): 1201–1204. doi:10.1103/physrevlett.22.1201. ISSN 0031-9007.  https://dx.doi.org/10.1103%2Fphysrevlett.22.1201
  3. See A. Sommerfeld, Lectures on Theoretical Physics (Academic Press, New York, NY, 1950), Vol. 4, p. 88-101, for further details of this derivation.
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