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Proceedings Paper

Shape measurement method of concave mirrors
Author(s): Miroslav Pech; Miroslav Hrabovský; Petr Schovánek; Dušan Mandát; Libor Nožka
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Paper Abstract

The theory, optical, mechanical, and software design for a special Hartmann wavefront analyzer is presented. This method is applied for the non-contact method of concave mirrors shape measurements. The so-called Hartmann test is used with the digital image reading and the fast computer data evaluation. In this method a small mask with several holes is used. Holes are radially positioned. The wavefront sensor measures a tilt of the wavefront or the mirror surface. The tilt measurements are then converted into a replica of the wavefront by performing a form of integration called wavefront reconstruction. Our institute Joint Laboratory of Optics produces segmented mirrors for the Pierre Auger observatory fluorescent detector. We use this method as the qualitative measuring of this spherical mirror segments. These segments are unique because they are light and ultrathin. The production of mirrors is based on standard operations commonly used in the optical industry (cutting, drilling, milling, grinding and polishing), with the difference that they are extremely thin. This fact can cause segment shape instability in the production process. This method objectively defines the shape and specifies the difference of the segment shape from an ideal surface in micrometer accuracy.

Paper Details

Date Published: 12 April 2007
PDF: 5 pages
Proc. SPIE 6609, 15th Czech-Polish-Slovak Conference on Wave and Quantum Aspects of Contemporary Optics, 660918 (12 April 2007); doi: 10.1117/12.739671
Show Author Affiliations
Miroslav Pech, Joint Lab. of Optics of Palacky Univ. and Institute of Physics (Czech Republic)
Miroslav Hrabovský, Joint Lab. of Optics of Palacky Univ. and Institute of Physics (Czech Republic)
Petr Schovánek, Joint Lab. of Optics of Palacky Univ. and Institute of Physics (Czech Republic)
Dušan Mandát, Joint Lab. of Optics of Palacky Univ. and Institute of Physics (Czech Republic)
Libor Nožka, Joint Lab. of Optics of Palacky Univ. and Institute of Physics (Czech Republic)


Published in SPIE Proceedings Vol. 6609:
15th Czech-Polish-Slovak Conference on Wave and Quantum Aspects of Contemporary Optics

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