Physics
Scientific paper
Dec 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985msngr..42....2p&link_type=abstract
The Messenger, vol. 42, p. 2-3
Physics
Interferometry:Methods Of Reduction, Methods Of Reduction:Interferometry
Scientific paper
Interferometric techniques have been used in optical testing for a long time. The introduction of the laser made this method a routine procedure in the evaluation of the quality of optical components. The interpretation of interferograms is in principie very simple. The fringes represent lines of equal phase difference between two wavefronts, one of which is often flat or spherical. The height difference between two adjacent fringes is usually one wavelength of the radiation used. From the shape and relative order number of the fringes, the map representing the phase difference between the two wavefronts can be reconstructed. Using this phase map, one can then proceed to calculate the more meaningful physical quantities like refractive index variation, distance or stress. This modelling process is different for each application. At ESO, interferometry is used in the testing of optical components for instruments, and programs have been developed that fit the phase map to a set of orthogonal quasi-Zernike eigenfunctions, representing the well-known optical aberrations like spherical aberration or coma. A difficulty has always been to enter into the computer the positions and order numbers of the fringes; up to now this was done manually. This paper briefly describes a new method of fringe analysis that reduces the manual interaction to aminimum, a more detailed explanation will be given in a forthcoming article.
Dekker Hans
Pirenne Benoit
Ponz Daniel
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