14 August 2001 Collimation testing based on self-imaging
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Proceedings Volume 4419, 4th Iberoamerican Meeting on Optics and 7th Latin American Meeting on Optics, Lasers, and Their Applications; (2001); doi: 10.1117/12.437235
Event: IV Iberoamerican Meeting of Optics and the VII Latin American Meeting of Optics, Lasers and Their Applications, 2001, Tandil, Argentina
Abstract
It is proposed a technique to test the collimation status of a beam. The testing combines a moire beating technique with a digital technique. A self-image of the grating produced by a collimated beam is stored in the memory of the frame grabber. When a decollimation of the laser beam exists, the self-image period is modified. The digital subtraction between both self-image gratings produce a beating pattern. The beating moire fringe spacing is related to the decollimation degree of the illuminating beam. The validity of the technique is verified experimentally by using lenses of various focal lengths.
© (2001) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Roberto Daniel Torroba, Nestor A. Bolognini, Myrian C. Tebaldi, Alberto A. Tagliaferri, "Collimation testing based on self-imaging", Proc. SPIE 4419, 4th Iberoamerican Meeting on Optics and 7th Latin American Meeting on Optics, Lasers, and Their Applications, (14 August 2001); doi: 10.1117/12.437235; https://doi.org/10.1117/12.437235
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KEYWORDS
Moire patterns

Collimation

Lenses

Frame grabbers

Lanthanum

CCD cameras

Digital signal processing

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