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1.3 PHYSICAL SCIENCES, Optics
An out-of-plane sensitive electronic speckle pattern interferometer (ESPI) using holographic optical elements (HOEs) for studying rotations and vibrations is presented. Phase stepping is implemented by modulating the wavelength of the laser diode in a path length imbalanced interferometer. The time average ESPI method is used for vibration measurements. Some factors influencing the measurements accuracy are reported. Some advantages and limitations of the system are discussed.
Viswanath Bavigadda, Mohesh Moothanchery, Manojit Pramanik, Emilia Mihaylova, Vincent Toal, "Compact holographic optical element-based electronic speckle pattern interferometer for rotation and vibration measurements," Proc. SPIE 10127, Practical Holography XXXI: Materials and Applications, 101270X (6 April 2017); DOI: 10.1117/12.2251266