23 July 1993 Holographic interferometry in nondestructive testing of composite materials
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Proceedings Volume 1983, 16th Congress of the International Commission for Optics: Optics as a Key to High Technology; 1983B4 (1993) https://doi.org/10.1117/12.2308819
Event: 16th Congress of the International Commission for Optics: Optics as a Key to High Technology, 1993, Budapest, Hungary
Abstract
The accuracy of a phase-shifting Ronchi test with a sinusoidal transmission grating is discussed. By supressing higher order diffraction components, sheared interferograms with a signal to noise ratio in excess of 60 to 1 have been achieved. The effects of non-sinusoidal characteristics of the grating and phase-shift errors were minimised by the use of a seven-sample phase-shifting algorithm. An aberrated wavefront from a lens was measured with a relative accuracy of better than 0.3%.
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Zdenek Zemanek, Zdenek Zemanek, } "Holographic interferometry in nondestructive testing of composite materials", Proc. SPIE 1983, 16th Congress of the International Commission for Optics: Optics as a Key to High Technology, 1983B4 (23 July 1993); doi: 10.1117/12.2308819; https://doi.org/10.1117/12.2308819
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