標題: Optical encoder based on the fractional Talbot effect
作者: Kao, CF
Lu, MH
光電工程學系
Department of Photonics
關鍵字: optical encoder;Talbot effect;self-image
公開日期: 1-Jun-2005
摘要: This paper presents a reflective optical encoder based on the Talbot self-image of binary phase grating. The proposed encoder has several advantages in comparison to conventional Moire effect based encoders, including larger gap between gratings, higher gap tolerance and greater light passage efficiency. This encoder with gap 220 mu m can accurately measure the position of linear stages which move at high-speed. The encoder includes a grating scale with period 20 mu m and provides a signal period of 20 mu m with a frequency response of approximately 200 kHz. This system and the associated electronics provide an interpolation factor of 200 that gives a resolution of 0.1 mu m. The repeatability is 0.2 mu m for a traveling length of 600 mm. (C) 2005 Elsevier B.V. All rights reserved.
URI: http://dx.doi.org/10.1016/j.optcom.2005.02.006
http://hdl.handle.net/11536/13642
ISSN: 0030-4018
DOI: 10.1016/j.optcom.2005.02.006
期刊: OPTICS COMMUNICATIONS
Volume: 250
Issue: 1-3
起始頁: 16
結束頁: 23
Appears in Collections:Articles


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