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• PCA
• PDS
• PECVD
• PEG
• phase
  • angle
  • shift parameter
• Planck constant
• PM
  • PM₁
  • PM_2.5
  • PM₁₀
• PMT
• polar nephelometer
• primary organic aerosol
• PS
• PSA
• PSD
• PSF
• PSICAM
• PV

PSF - point spread function, an image of a point light source viewed through an optical system and/or a turbid medium. PSF represents the effect on the image formation of imperfections of the system and/or of the scattering of light by the medium. See also Point spread function: Definition and Beam spread function: Definition