A simple and robust technique for absolute phase measurement based on number theory is presented. The new, to our knowledge, technique, which is compared with the Gushov–Solodkin algorithm, surmounts the shortcomings in the Gushov–Solodkin algorithm. The technique permits the three-dimensional shape measurement of objects that have discontinuous height steps and has resulted in a new and more powerful method of measuring surface absolute profile. Experimental results are presented that demonstrate the validity of the principle.
© 2001 Optical Society of America
(120.2650) Instrumentation, measurement, and metrology : Fringe analysis
(120.5050) Instrumentation, measurement, and metrology : Phase measurement
(120.6650) Instrumentation, measurement, and metrology : Surface measurements, figure
(150.6910) Machine vision : Three-dimensional sensing
Jingang Zhong and Yonglin Zhang, "Absolute Phase-Measurement Technique Based on Number Theory in Multifrequency Grating Projection Profilometry," Appl. Opt. 40, 492-500 (2001)