Zero-crossing demodulation for open-loop Sagnac interferometers

Tselikov, A. A.; Arruda, Josiel Urbaninho de; Blake, J.

doi:10.1109/50.712244

Cited by 15 publications

(11 citation statements)

References 6 publications

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“…This sensor measures the non-reciprocal phase changes that arise between light propagating in clockwise and counter-clockwise directions. In gyroscope sensing applications, the phase shift gives a measure of the rotation of the loop about its axis (Saida & Hotate, 1999;Barbour & Schmidt, 2001;Tselikov et al, 1998). The optical configuration shown in Fig.…”

Section: Optical Configurationsmentioning

confidence: 99%

Modern Metrology Concerns

Cocco¹

2012

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is a professional engineer in the field of racing and luxury automobiles who has worked in Research & Design Department of Ferrari F1 team and in Maserati Product Development as electronic integration project chief. Currently he is responsible for electronic parts in Supply Quality of Automobili Lamborghini S.p.A. He earned a master degree in Telecommunication Engineering and a Ph.D. in Information Engineering. He specialized in electronic measurement and digital signal processing and has published several papers for international conferences and journals. ContentsPreface XI Section Introduction 1

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Section: Optical Configurationsmentioning

confidence: 99%

Modern Metrology Concerns

Cocco¹

2012

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“…The output signal of open-loop IFOG is nonlinear, so it is necessary to introduce special signal processing techniques. A lot of techniques have been developed to extend the linear range of open-loop gyroscopes, such as passive phase shift 1 , zero-crossing demodulation 2,3 . Although the huge technological effort has been exerted to optimize the performance of IFOG, the techniques will increase the cost and make the structure of IFOG complicated.…”

Section: Introductionmentioning

confidence: 99%

A novel realization of signal processing to improve the precision of the open-loop IFOG

Li¹,

Chen²,

Fu³

2005

SPIE Proceedings

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With the development of the technique of the digital signal processor, the using of digital signal processor in the open loop IFOG (interferometric fiber optic gyroscope) signal processing brings a great improvement of the performance of IFOG, especially in the technique of digital filtering, acquisition the values of arcsine and inverse tan function. The traditional way to get the values of inverse tan function is linear interpolation technique in digital signal circuit. This article put forward a new way to acquire the values of inverse tan function, the proportion of the second order Bessel function to the first order Bessel function and the proportion of the fourth order Bessel function to the second order Bessel function by using of the virtue of DSP, high speed of data processing. The fundamental, second and fourth harmonic signals from photoelectrical detector are sampled and demodulated by analog circuit. Then the signals from analog circuit are sampled into DSP by a 24-bit analog-to-digital converter, which is used to improve the dynamical range of the system. Then DSP computes the values mentioned above by polynomial approach. The simulation in Mathematic and Microsoft Visual C++ 6.0 proved that the method of polynomial approach to the functions has higher precision compared to the method of linear interpolation. Meanwhile the designed circuit shows it can meet the demand of real time data process. The tested results of designed circuit prove it has a great improvement in the dynamic range and precision of IFOG.

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“…C. Santos é professor doutor do Departamento de Engenharia de Energia e Automação Elétricas -PEA da Escola Politécnica da Universidade de São Paulo -EPUSP, São Paulo -SP, CEP: 05508-010, BRASIL (e-mail: josemir@pea.usp.br). utilizadas, que apresentam duas vantagens em relação às técnicas anteriormente publicadas de análise de sinais interferométricos, sejam as do domínio da freqüência (entre as quais destacam-se a de "lock-in" [2] e a de filtragem e processamento das harmônicas de ordem n = 1, 2, 3 e 4 [3] do referido sinal), sejam as do domínio do tempo (com ênfase à de detecção de cruzamentos por zero do referido sinal interferométrico [4]). A técnica ora proposta permite implementações em topologias mais simples, oferecendo em sua saída, medidas não apenas independentes da flutuação da potência óptica do enlace, mas, principalmente, com excelente relação sinal-ruído, comparável à obtida utilizando "lock-in" profissional [1].…”

Section: Introductionunclassified

Coherent Demodulation of the Output Signal of Optical Voltage Transformer

Almeida

Santos²

2005

IEEE Latin Am. Trans.

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This work addresses a technique of coherent demodulation based on the synchronous detection of peak and valley values of the photocurrent produced by a photodiode connected through an optical fiber to the output of a recover interferometer, which is part of an Optical Voltage Transformer (OVT). The adopted OVT topology allows the recover interferometer output signal to hold the relevant information about the ac high-voltage applied to a sensor interferometer. A series of tests was conducted to estimate the OVT performance, in a laboratory environment, measuring ac high-voltages up to 20kV. The good results obtained are very promising, and encourages to pursue this research aiming to develop an OVT prototype suitable for application in electrical distribution and transmission substations.Index Terms-high voltage techniques, optical fiber transducers, optical variables measurement, signal demodulation, signal processing.

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Zero-crossing demodulation for open-loop Sagnac interferometers

Cited by 15 publications

References 6 publications

Modern Metrology Concerns

Modern Metrology Concerns

A novel realization of signal processing to improve the precision of the open-loop IFOG

Coherent Demodulation of the Output Signal of Optical Voltage Transformer

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