Abstract
Nd:YAG rod wavefront distortion has been quantified in aTwyman-Green interferometer which employs themultiplicative analogical moiré phase-shifting method for demodulation. The measuring procedureis based on the superimposition of a transmission grating located outside theinterferometric module with a phase modulated high-frequency Twyman-Greenspatial carrier. Later, a set of fringe patterns, provided by low-passfiltering of the phase-shifted multiplicative moiré patterns obtained, iscombined in a generic phase-shifting algorithm (GPSA). The interesting testinformation is achieved once the previous procedure has been carried out with andwithout the transparent object located in the measuring area. The wavefrontdistortion (WFD) is calculated by the subtraction of these results provided bythe GPSA, or directly if a differential phase-shifting algorithm (DPSA) is employed. The WFD obtainedis in accordance with characteristics of the test object. The comparison ofthe results obtained with both families of algorithms provides information aboutthe sensitivities to error sources of the DPSA employed. A first approximation tothe analysis of significant error sources of DPSAs is presented.
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