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Optical Engineering

Measuring the parallelism of transparent and nontransparent plates
Author(s): Alberto Jaramillo-Nunez; Carlos I. Robledo-Sanchez; Alejandro Cornejo-Rodriguez
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Paper Abstract

A technique for measuring the parallelism of the surfaces of transparent and nontransparent plates is presented. To obtain a measure of the wedge angle between the two surfaces of the transparent plate, the technique utilizes the displacement of a laser beam that is produced after passing through the sample twice. To measure the parallelism in nontransparent plates a Twyman-Green interferometer is used in conjunction with the apparatus described for measuring transparent plates. In this case, the displacement of the laser beam is produced after reflection off a single face of the plate. In both cases, the measurements can be made visually with the aid of an electronically generated circular scale stored on a personal computer, or automatically by the same computer. The precision of the measurements can be suitably modified by changing the setup parameters.

Paper Details

Date Published: 1 December 1996
PDF: 5 pages
Opt. Eng. 35(12) doi: 10.1117/1.601083
Published in: Optical Engineering Volume 35, Issue 12
Show Author Affiliations
Alberto Jaramillo-Nunez, Instituto Nacional de Astrofisica (Mexico)
Carlos I. Robledo-Sanchez, Instituto Nacional de Astrofisica (Mexico)
Alejandro Cornejo-Rodriguez, Instituto Nacional de Astrofisica (Mexico)

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