Heterodyne grating interferometer based on a quasi-common-optical-path configuration for a two-degrees-of-freedom straightness measurement

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Title:	Heterodyne grating interferometer based on a quasi-common-optical-path configuration for a two-degrees-of-freedom straightness measurement
Authors:	Lee,JY;Hsieh,HL;Lerondel,G;Deturche,R;Lu,MP;Chen,JC
Contributors:	機械工程學系
Keywords:	DISPLACEMENT MEASUREMENT;MEASUREMENT SYSTEM;LASER;MICROSCOPY;POSITION;SENSOR;RANGE
Date:	2011
Issue Date:	2012-03-27 17:07:18 (UTC+8)
Publisher:	國立中央大學
Abstract:	We present a heterodyne grating interferometer based on a quasi-common-optical-path (QCOP) design for a two-degrees-of-freedom (DOF) straightness measurement. Two half-wave plates are utilized to rotate the polarizations of two orthogonally polarized beams. The grating movement can be calculated by measuring the phase difference variation in each axis. The experimental results demonstrate that our method has the ability to measure two-DOF straightness and still maintain high system stability. The proposed and demonstrated method, which relies on heterodyne interferometric phase measurement combined with the QCOP configuration, has the advantages of high measurement resolution, relatively straightforward operation, and high system stability. (C) 2011 Optical Society of America
Relation:	APPLIED OPTICS
Appears in Collections:	[Departmant of Mechanical Engineering ] journal & Dissertation

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