Nonlinear error signal extraction technique for real-time digital automatic control of optical interferometers

Fabrizio Barone; Enrico Calloni; Luciano DiFiore; Aniello Grado; Leopoldo Milano; G. Russo

doi:10.1117/12.207691

20 April 1995 Nonlinear error signal extraction technique for real-time digital automatic control of optical interferometers

Fabrizio Barone, Enrico Calloni, Luciano DiFiore, Aniello Grado, Leopoldo Milano, G. Russo

Author Affiliations +

Proceedings Volume 2444, Smart Structures and Materials 1995: Smart Sensing, Processing, and Instrumentation; (1995) https://doi.org/10.1117/12.207691
Event: Smart Structures and Materials '95, 1995, San Diego, CA, United States

Abstract

In this paper we describe the non linear error signal extraction, which is an efficient and robust technique for the automatic control of optical interferometers. It represents a global solution to the problem of the longitudinal error signal extraction also when the uncontrolled optical system spans hundreds of fringes. This technique basically uses classic modulation techniques (phase modulation, mechanical modulation, etc.), but extends their range of validity using also the information available at the output photodiode. We have digitally implemented such technique following modular hardware and software architectures. In fact, the hardware consists of commercial VME boards for A/D and D/A conversion and processing, housed in standard VME crates, while the software algorithm is written in standard C language for portability and easy integration within digital control architectures.

Citation Download Citation

Fabrizio Barone, Enrico Calloni, Luciano DiFiore, Aniello Grado, Leopoldo Milano, and G. Russo "Nonlinear error signal extraction technique for real-time digital automatic control of optical interferometers", Proc. SPIE 2444, Smart Structures and Materials 1995: Smart Sensing, Processing, and Instrumentation, (20 April 1995); https://doi.org/10.1117/12.207691

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