1 September 2001 Phase errors in low-frequency vibration measurement with high-speed phase-shifting speckle pattern interferometry
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Optical Engineering, 40(9), (2001). doi:10.1117/1.1397764
Abstract
When mechanical vibrations are measured by means of a dynamic phase-shifting speckle pattern interferometer, the deformation can be tracked with an error that depends on the amplitude and frequency of the vibration. We use a numerical simulation based on a detailed mathematical model of the system to predict the expected frequency response of the root mean square (rms) measurement error in the time-varying phase difference maps. The performance of four phase- shifting algorithms (three-frame, four-frame, Carre, and Schwider- Hariharan five-frame) and a temporal phase unwrapping method is studied over a range of vibrational amplitudes and frequencies. The numerical results indicate that the Carre algorithm is the preferred phase-shifting method to measure vibrations with a dynamic electronic speckle pattern interferometry (ESPI) system. Vibration frequencies up to 30% of the carrier frequency can be measured with an rms phase change error less than l0% of the vibration amplitude. The numerical results are finally compared with experimental data, acquired using a 1000 frame/s phase-shifting speckle interferometer together with a laser vibrometer, which provides a reference phase measure.
Pablo D. Ruiz, Jonathan Mark Huntley, Y. Shen, C. R. Coggrave, Guillermo H. Kaufmann, "Phase errors in low-frequency vibration measurement with high-speed phase-shifting speckle pattern interferometry," Optical Engineering 40(9), (1 September 2001). http://dx.doi.org/10.1117/1.1397764
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KEYWORDS
Picosecond phenomena

Phase shifts

Speckle

Interferometers

Cameras

Error analysis

Vibrometry

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