Abbreviation for piezoelectric transducer. This component modulates the phase of the interference pattern across the detector by moving the objective and hence the reference surface.

A registered trademark of Clevite Corporation to identify a family of lead zirconate -- lead titanate compositions. It has become a common acronym for all piezoelectric ceramics. Ratio of peak energy stored per cycle divided by total dissipation in a radian period. High Q dynamic systems exhibit longer rise and delay times.

Lead (Plumbum = Pb) Zirconate Titanate; a common man-made piezoelectric ceramic.