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Proceedings Paper

Nonlinear error signal extraction technique for real-time digital automatic control of optical interferometers
Author(s): Fabrizio Barone; Enrico Calloni; Luciano DiFiore; Aniello Grado; Leopoldo Milano; G. Russo
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Paper 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.

Paper Details

Date Published: 20 April 1995
PDF: 7 pages
Proc. SPIE 2444, Smart Structures and Materials 1995: Smart Sensing, Processing, and Instrumentation, (20 April 1995); doi: 10.1117/12.207691
Show Author Affiliations
Fabrizio Barone, Istituto Nazionale di Fisica Nucleare and Univ. di Napoli (Italy)
Enrico Calloni, Istituto Nazionale di Fisica Nucleare (Italy)
Luciano DiFiore, Istituto Nazionale di Fisica Nucleare (Italy)
Aniello Grado, Istituto Nazionale di Fisica Nucleare and Univ. di Napoli (Italy)
Leopoldo Milano, Istituto Nazionale di Fisica Nucleare and Univ. di Napoli (Italy)
G. Russo, Istituto Nazionale di Fisica Nucleare and Univ. della Calabria (Italy)


Published in SPIE Proceedings Vol. 2444:
Smart Structures and Materials 1995: Smart Sensing, Processing, and Instrumentation
William B. Spillman, Editor(s)

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