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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

PSICAM - point-source integrating-cavity absorption meter. This type of the absorption meter is optimized for use with dispersion of particles, i.e. a medium that not only absorbs but also scatters light. In this instrument, the sample fills a spherical integrating cavity which is illuminated by a "point source" located at the center of the cavity. Due to the high and diffuse reflectivity of the cavity surface, light scattered by particles in the sample is to a large degree retained inside the cavity, making the power of light reaching a detector located at the cavity surface and shielded from the direct illumination by the point source, dependent primarily on the absorption of light by the sample.