Contactless dimensional measurement by laser beam scanning

Constantin Blanaru; Victor S. Damian; Dan Apostol; Gheorghe Popescu; V. Valeanu; H. Bozdog; Dorin Todor

doi:10.1117/12.203476

8 March 1995 Contactless dimensional measurement by laser beam scanning

Constantin Blanaru, Victor S. Damian, Dan Apostol, Gheorghe Popescu, V. Valeanu, H. Bozdog, Dorin Todor

Proceedings Volume 2461, ROMOPTO '94: Fourth Conference in Optics; (1995) https://doi.org/10.1117/12.203476
Event: ROMOPTO '94: 4th Conference on Optics, 1994, Bucharest, Romania

Abstract

Accurate dimensional measurement is a stringent demand of today technology. Sometimes, the measurement is difficult because the body under test is not touchable. A modern solution of these two problems is contactless dimensional measurement by laser beam scanning. A moving mirror, driven by a scanner, reflects the incident He-Ne laser beam and forces it to describe a plane. A collimator transforms the plane in a parallel one, which defines the measuring field. When the test body is in the measuring field, it generates a shadow area, with a length proportional to the dimension of the body. This light distribution focuses on the surface of a photo-detector and then the electronic system processes it in order to display the results of the measurement. To prove this method, a set-up has been developed; its block-diagram is presented and the preliminary results are reported. Measuring range is (2 - 75) mm, resolution is of 1 micrometers and the accuracy is +/- 10 micrometers (2 (sigma) ).

Citation Download Citation

Constantin Blanaru, Victor S. Damian, Dan Apostol, Gheorghe Popescu, V. Valeanu, H. Bozdog, and Dorin Todor "Contactless dimensional measurement by laser beam scanning", Proc. SPIE 2461, ROMOPTO '94: Fourth Conference in Optics, (8 March 1995); https://doi.org/10.1117/12.203476

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KEYWORDS

Optical testing

Mirrors

3D scanning

Helium neon lasers

Laser scanners

Scanners

Signal detection

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