Adaptive control system for improvement of contrast in interferograms

Nicolás Veloz; Jesús González-Laprea; Rafael Escalona

doi:10.1117/12.2024136

6 September 2013 Adaptive control system for improvement of contrast in interferograms

Nicolás Veloz, Jesús González-Laprea, Rafael Escalona

Proceedings Volume 8839, Dimensional Optical Metrology and Inspection for Practical Applications II; 88390N (2013) https://doi.org/10.1117/12.2024136
Event: SPIE Optical Engineering + Applications, 2013, San Diego, California, United States

Abstract

The present work consists on the development of an adaptive control system to compensate the reduction of the contrast in interferograms caused by mechanical vibrations present in a Mirau based interference microscopy system. The control generates random signals that are injected during the integration time of the camera through a piezoelectric device in order to change the phase of the interferometer. Each obtained image has different control signals injected during the integration time. The contrast is evaluated and if the contrast is improved, the signal injected is adjusted to seek for a better improvement. The best signals collected are added to the control signal, which is applied to the system after the adaptation process is over. The control scheme implemented is capable of finding signals to compensate the main frequency noisy components of the system.

Citation Download Citation

Nicolás Veloz, Jesús González-Laprea, and Rafael Escalona "Adaptive control system for improvement of contrast in interferograms", Proc. SPIE 8839, Dimensional Optical Metrology and Inspection for Practical Applications II, 88390N (6 September 2013); https://doi.org/10.1117/12.2024136

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