White-light interferometry, Hilbert transform, and noise

0399454 - FZÚ 2014 RIV US eng C - Konferenční příspěvek (zahraniční konf.)
Pavlíček, Pavel - Michálek, Václav
White-light interferometry, Hilbert transform, and noise.
Czech-Polish-Slovak Optical Conference on Wave and Quantum Aspects of Contemporary Optics /18./. Bellingham: SPIE, 2012 - (Peřina jr., J.; Nožka, L.; Hrabovský, M.; Senderáková, D.; Urbańczyk, W.). Proceedings of SPIE, 8697. ISBN 978-0-8194-9481-8. ISSN 0277-786X.
[Czech-Polish-Slovak optical conference on wave and quantum aspects of contemporary optics /18./. Ostravice (CZ), 03.09.2012-07.09.2012]
Grant CEP: GA TA ČR TA01010517
Výzkumný záměr: CEZ:AV0Z10100522
Klíčová slova: white-light interferometry * Hilbert transform * noise * measurement uncertainty
Kód oboru RIV: BH - Optika, masery a lasery

White-light interferometry is an established and proved method for the measurement of the geometrical shape of objects. The advantage of white-light interferometry is that it is suitable for the measurement of the shape of objects with smooth as well as rough surface. The information about the longitudinal coordinate of the surface of the measured object is obtained from the white-light interferogram. The interferogram is the intensity at the detector expressed as the function of the position of the object. (The object is moved along the optical axis during the measurement process.) If the shape of an object with rough surface is measured, the phase of the interferogram is not evaluated because it is a random value. The information about the longitudinal coordinate is obtained from the center of the interferogram envelope. A classical method for the calculation of the envelope of white-light interferogram is the demodulation by means of Hilbert transform.
Trvalý link: http://hdl.handle.net/11104/0226778