fáziseltéréstl
Fáziseltéréstl is a term used in physics and engineering to denote a phase shift, the difference in the phase angle between two periodic signals or waves. The shift is commonly expressed in radians or degrees and, for a constant frequency f, corresponds to a time delay Δt via φ = ωΔt, where ω = 2πf. In optics, a phase shift produced by a path length difference ΔL is φ = (2π/λ)ΔL, with λ the wavelength. Different conventions may apply opposite signs depending on the reference.
Causes of phase shifts include differences in propagation speed through media, geometric path differences, dispersion, modulation,
Measurement and estimation methods rely on comparing phases. Interferometry (for example Michelson or Mach–Zehnder setups) directly
Applications span telecommunications, where phase modulation and phase-shift keying encode information; radar and LIDAR, where phase
Challenges include the periodic nature of phase modulo 2π, which requires unwrapping to obtain continuous phase