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|Title:||Measurement of slopes and profile of an optical lens by shearography||Authors:||Tay, C.J.
|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. https://doi.org/10.1016/S0263-2241(96)00060-7||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||URI:||http://scholarbank.nus.edu.sg/handle/10635/58455||ISSN:||02632241||DOI:||10.1016/S0263-2241(96)00060-7|
|Appears in Collections:||Staff Publications|
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