Title :
A quarter-wave phase stepping for fiber-optic ESPI by zero-crossing detection
Author :
Park, Hyoung Jun ; Song, Minho
Author_Institution :
Div. of Electron. & Inf. Eng., Chonbuk Nat. Univ., Chonju, South Korea
Abstract :
By locating zero-crossings in interference signal, a fast and accurate π/2 phase stepping has been achieved for fiber-optic ESPI. We obtained phase errors less than 0.6 mrad, regardless of nonlinear characteristics of the PZT phase modulator.
Keywords :
electronic speckle pattern interferometry; fibre optic sensors; optical modulation; phase modulation; phase shifting interferometry; PZT phase modulator; fiber-optic ESPI; interference signal; phase errors; quarter-wave phase stepping; zero-crossing detection; Interference; Laser beams; Optical devices; Optical fibers; Optical interferometry; Phase detection; Phase modulation; Signal generators; Speckle; Vibration measurement;
Conference_Titel :
Lasers and Electro-Optics Society, 2005. LEOS 2005. The 18th Annual Meeting of the IEEE
Print_ISBN :
0-7803-9217-5
DOI :
10.1109/LEOS.2005.1548331
