20 April 1995 Nonlinear error signal extraction technique for real-time digital automatic control of optical interferometers
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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.
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Fabrizio Barone, Fabrizio Barone, Enrico Calloni, Enrico Calloni, Luciano DiFiore, Luciano DiFiore, Aniello Grado, Aniello Grado, Leopoldo Milano, Leopoldo Milano, G. Russo, 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); doi: 10.1117/12.207691; https://doi.org/10.1117/12.207691
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