標題: Full-field refractive index distribution measurement of a gradient-index lens with heterodyne interferometry
作者: Hsieh, Hung-Chih
Chen, Yen-Liang
Wu, Wang-Tsung
Chang, Wei-Yao
Su, Der-Chin
光電工程學系
光電工程研究所
Department of Photonics
Institute of EO Enginerring
關鍵字: GRIN lens;heterodyne interferometry;full-field measurement;refractive index;sine wave fitting algorithm
公開日期: 1-Oct-2010
摘要: A light beam coming from a circular heterodyne light source with an electro-optic modulator is incident on a gradient-index lens obliquely. The reflected light passes through an analyzer and an imaging lens, and is recorded by a fast CMOS camera. A group of periodic sinusoidal segments recorded by each pixel is modified, and its associated phase is derived with a unique technique. The processes are applied to other pixels; the two-dimensional phase distribution can be obtained similarly. The estimated data are substituted into the special equations derived from Fresnel's equations, and the full-field refractive index distribution of the gradient-index lens can be obtained. This method has the merits of both common-path interferometry and heterodyne interferometry.
URI: http://dx.doi.org/10.1088/0957-0233/21/10/105310
http://hdl.handle.net/11536/150024
ISSN: 0957-0233
DOI: 10.1088/0957-0233/21/10/105310
期刊: MEASUREMENT SCIENCE AND TECHNOLOGY
Volume: 21
Appears in Collections:Articles