A novel shearing interferometer is described that uses an optimized phase grating as the shearing element. The method has a number of advantages over a conventional Michelson interferometer shearing device, including light efficiency, simplicity, and low cost. Quantitative fringe analysis is easily carried out by in-plane translation of the grating and the use of standard phase-shifting algorithms. The influence of higher diffraction orders on the noise in the measured phase distributions is discussed. Downloaded From: http://opticalengineering.spiedigitallibrary.org/ on 05/15/2015 Terms of Use: http://spiedl.org/terms
Ein neues Verfahren zur berührungslosen Messung des Augeninnendrucks (IOP) beruht auf der Tatsache, dass die Schwingungseigenschaften des Auges vom IOP abhängig sind. Es werden Verfahren beschrieben, mit denen das menschliche Auge berührungslos zu Schwingungen angeregt werden kann. Mit einem piezokeramischen Ultraschallwandler wurden Messungen in-vivo durchgeföhrt. Damit konnten die dem Messverfahren zugrundegelegten Prinzipien bestätigt werden.
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