Measurement for thickness variation of a latex membrane by ESPI method

Anand Krishna Asundi; Lijun Jiang

doi:10.1117/12.347771

7 May 1999 Measurement for thickness variation of a latex membrane by ESPI method

Anand Krishna Asundi, Lijun Jiang

Proceedings Volume 3740, Optical Engineering for Sensing and Nanotechnology (ICOSN '99); (1999) https://doi.org/10.1117/12.347771
Event: Optical Engineering for Sensing and Nanotechnology (ICOSN '99), 1999, Yokohama, Japan

Abstract

A simple and unique ESPI based system for real-time monitoring and measuring of thickness variation of semi-transparent membrane with an 'optically rough surface' is described in this paper. When membrane or film is illuminated by a coherent beam, a speckle pattern is produced on its rough surface. Reflected beams from both the bottom and top surfaces of the membrane combine and form a speckle interferometric pattern, which can be captured by CCD camera. Subtraction of sequentially captured images result in correlation fringes corresponding to thickness variation of the specimen. The beams reflected from both bottom and top surfaces serve as 'reference' beam for each other mutually. All the beams coming from the tested object possess an auto-reference feature and this makes the system more stable and simple.

Citation Download Citation

Anand Krishna Asundi and Lijun Jiang "Measurement for thickness variation of a latex membrane by ESPI method", Proc. SPIE 3740, Optical Engineering for Sensing and Nanotechnology (ICOSN '99), (7 May 1999); https://doi.org/10.1117/12.347771

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available