1 December 1996 Measuring the parallelism of transparent and nontransparent plates
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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.
Alberto Jaramillo-Nunez, Carlos I. Robledo-Sanchez, Alejandro Cornejo-Rodriguez, "Measuring the parallelism of transparent and nontransparent plates," Optical Engineering 35(12), (1 December 1996). https://doi.org/10.1117/1.601083 . Submission:

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