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Photocathode
Light sensitive layer that emits photoelectrons under illumination. The photoelectron current is proportional over a wide range to the illumination intensity. Photocathodes are characterized by their spectral sensitivity. Typical sensitivity curves for visible light detection are named for example S1, S20 or S25. The electron emission takes place within less than one Picosecond.
PIV
The particle imaging velocimetry describes a measurement method where two pictures of particles are taken. As the time difference between this pictures is well defined, the position difference for each particle allows to calculate the local particle speed. High-Speed cameras allow to extend traditional PIV applications as they may acquire successive PIV images with high repetition rates.
Pixel (picture element)
Smallest element of a digitally captured or processed image
