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Titolo:
Automatic phase stepping in fiber-optic ESPI by closed-loop gain switching
Autore:
Martini, G; Facchini, M; Parisi, D;
Indirizzi:
Univ Pavia, Dipartimento Elettron, I-27100 Pavia, Italy Univ Pavia PaviaItaly I-27100 partimento Elettron, I-27100 Pavia, Italy Commiss European Communities, Joint Res Ctr, Ispra Site, Inst Syst Engn & Informat, I-21020 Ispra, Italy Commiss European Communities Ispra Italy I-21020 t, I-21020 Ispra, Italy
Titolo Testata:
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
fascicolo: 4, volume: 49, anno: 2000,
pagine: 823 - 828
SICI:
0018-9456(200008)49:4<823:APSIFE>2.0.ZU;2-T
Fonte:
ISI
Lingua:
ENG
Soggetto:
SHIFTING INTERFEROMETRY;
Keywords:
electrooptic measurements; electro optic modulation; optical fibers; optical fiber telemetry; optical interferometry; phase modulation; speckle;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Engineering, Computing & Technology
Citazioni:
11
Recensione:
Indirizzi per estratti:
Indirizzo: Martini, G Univ Pavia, Dipartimento Elettron, Via Palestro 3, I-27100 Pavia, Italy Univ Pavia Via Palestro 3 Pavia Italy I-27100 100 Pavia, Italy
Citazione:
G. Martini et al., "Automatic phase stepping in fiber-optic ESPI by closed-loop gain switching", IEEE INSTR, 49(4), 2000, pp. 823-828

Abstract

In this paper we describe a new technique for automatic phase stepping In fiber-optic Electronic Speckle Pattern Interferometry, (ESPI), useful in both single-point and imaging configurations. The proposed technique is basedon closed-loop switching of the gain sign in the control loop used to stabilize the reference wavefront phase, with the aid of a Proportional-Integral (P.I.) controller. Simulation and experimental results are compared, showing that by a synchronization signal or by a proper choice of the feedback loop parameters, a sequence of pi/2 steps of the reference wavefront phase,all of the same sign, is obtained. The residual fluctuation of each phase step amounts to +/-2.5 mr over a bandwidth of 200 Hz, This level of phase stability is well suited for ESPI aplications.

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Documento generato il 03/04/20 alle ore 11:00:14