Digital demodulation of an interferometer for the characterization of vibrating microstructures

Brandon Douglas Pitt; Tristan Jorge Tayag; Mendy Lynn Nelson

doi:10.1117/12.505795

4 November 2003 Digital demodulation of an interferometer for the characterization of vibrating microstructures

Brandon Douglas Pitt, Tristan Jorge Tayag, Mendy Lynn Nelson

Proceedings Volume 5188, Advanced Characterization Techniques for Optics, Semiconductors, and Nanotechnologies; (2003) https://doi.org/10.1117/12.505795
Event: Optical Science and Technology, SPIE's 48th Annual Meeting, 2003, San Diego, California, United States

Abstract

The rapid expansion of the microelectromechanical systems (MEMS) industry and the increasing number of applications in communications, displays, and sensing has led to an increasing demand for robust characterization techniques capable of in situ characterization of MEMS structures. Interferometry is well suited to such characterization due to its wide measurement dynamic range, its fine resolution, and its non-invasive qualities. We have constructed a fiber optic interferometer for the in situ characterization of MEMS structures. We report the development and implementation of a real-time digital signal processing (DSP) algorithm to demodulate the interferometer. We have developed a computationally efficient algorithm for both stabilization of the interferometer at quadrature and determination of the target’s vibration amplitude. We have verified our demodulation scheme using a piezoelectric transducer driven mirror as the target. Our current system will measure vibration amplitudes down to 10 nm. Both theoretical and experimental results are presented.

Citation Download Citation

Brandon Douglas Pitt, Tristan Jorge Tayag, and Mendy Lynn Nelson "Digital demodulation of an interferometer for the characterization of vibrating microstructures", Proc. SPIE 5188, Advanced Characterization Techniques for Optics, Semiconductors, and Nanotechnologies, (4 November 2003); https://doi.org/10.1117/12.505795

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