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Type: Artigo de periódico
Title: High resolution demodulation technique for Sagnac fibre optics gyroscopes using a low frequency quasi-synchronous clock
Author: Fernandes, AP
Ferreira, EC
Dias, JAS
Abstract: A simple technique which employs a low frequency quasi-synchronous clock was developed to measure duty-cycles with high resolution. For the same measurement resolution, the proposed circuit can operate with clock frequencies typically 1000 times lower than in conventional digital duty-cycle measurement system with synchronous clock. The proposed circuit is composed of only two Digital Direct Synthesis integrated circuits and one Complex Programmable Logic Device. Experimental results obtained with a prototype of the proposed time measurement system show that, for an emulated zero-cross fibre optics gyroscope output signal with 100 kHz and Delta T = 100 ns (duty-cycle of 50.25%), a resolution of 100 ps can be achieved using a 10.01 MHz frequency clock. (C) 2011 Elsevier GmbH. All rights reserved.
Subject: Duty-cycle measurement
Fibre optics gyroscopes
Zero-cross demodulator
Quasi-synchronous clock
Country: Alemanha
Editor: Elsevier Gmbh, Urban & Fischer Verlag
Citation: Aeu-international Journal Of Electronics And Communications. Elsevier Gmbh, Urban & Fischer Verlag, v. 66, n. 2, n. 150, n. 152, 2012.
Rights: fechado
Identifier DOI: 10.1016/j.aeue.2011.06.003
Date Issue: 2012
Appears in Collections:Unicamp - Artigos e Outros Documentos

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