Expand this Topic clickable element to expand a topic
Skip to content
Optica Publishing Group

Dual-confocal fiber-optic method for absolute measurement of refractive index and thickness of optically transparent media

Not Accessible

Your library or personal account may give you access

Abstract

We present a novel noncontact optical method for absolute measurement of refractive index and thickness of optically transparent media. The method is based on a simple dual-confocal fiber-optic sensor design. It includes two independent confocal channels consisting of two identical apertureless fiber-optic-type confocal microscopes constructed by use of a single 2×2 fiber coupler. A geometrical-ray model is used to obtain the analytical dependence between the sample’s refractive index and its thickness. The measurement method provides high accuracy in spatially locating the specific imaging points that correspond to the backreflected intensity peaks of the confocal responses. Thus, a simultaneous measurement of the sample refractive index and thickness is achieved.

© 2002 Optical Society of America

Full Article  |  PDF Article
More Like This
Simultaneous measurement of refractive index and thickness by combining low-coherence interferometry and confocal optics

Seokhan Kim, Jihoon Na, Myoung Jin Kim, and Byeong Ha Lee
Opt. Express 16(8) 5516-5526 (2008)

Measurement of thickness and refractive index of transparent material synchronously based on chromatic confocal sensor

Wu Yunquan, Chang Suping, Zeng Wenhan, Jiang Xiangqian, and Lu Wenlong
Opt. Express 31(26) 42754-42763 (2023)

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Figures (3)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Equations (3)

You do not have subscription access to this journal. Equations are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Select as filters


Select Topics Cancel
© Copyright 2024 | Optica Publishing Group. All Rights Reserved