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Title: Measurement of slopes and profile of an optical lens by shearography
Authors: Tay, C.J. 
Shang, H.M. 
Neo, A.L.
Keywords: Lens
Issue Date: Jul-1996
Citation: Tay, C.J.,Shang, H.M.,Neo, A.L. (1996-07). Measurement of slopes and profile of an optical lens by shearography. Measurement: Journal of the International Measurement Confederation 18 (3) : 185-191. ScholarBank@NUS Repository.
Abstract: In this paper, an optical technique based on speckle-shearing interferometry and a double refractive-index method is employed for the measurement of surface slopes and profile of an optical lens. The lens to be studied is mounted on one side of a glass tank filled with water and illuminated with a collimated coherent light source. The lens image is captured on a photographic film placed at the image plane of an image-shearing camera. A second exposure on the photographic film is made after the container is refilled with a liquid of different refractive index. The resulting photograph yields a fringe pattern which represents lines of constant derivatives of the surface profile. Test results conducted on a plano-concave lens compared favorably with theoretical predictions. Copyright © 1996 Elsevier Science Ltd.
Source Title: Measurement: Journal of the International Measurement Confederation
ISSN: 02632241
DOI: 10.1016/S0263-2241(96)00060-7
Appears in Collections:Staff Publications

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