Precision and sensitivity optimization for white-light interferometric fiber-optic sensors

Tapia-Mercado, J.; Khomenko, A. V.; García-Weidner, A.

doi:10.1109/50.914487

Cited by 41 publications

(34 citation statements)

References 11 publications

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“…Having the merit of compact structure, short coherence length, easy to adjustment light path, any fringe constant and so on, FVISAR is widely used in the velocity (acceleration) measurement since it is posed in 1996 by scientist L. Levin. [2] Great efforts have been made to improve the AFVISAR technique with emphasis on the device reform [3,4] or the technique application [5,6 ]. The analysis of measuring error for AFVISAR system is infrequent.…”

Section: Introductionmentioning

confidence: 99%

Analysis of measuring error for AFVISAR system

Wang

Meng

2008

SPIE Proceedings

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AFVISAR (all fiber velocity interferometer system for any reflector), which is developed from laser Doppler method, has been proved to be effective and powerful technique in acceleration (and velocity) measurement. The measuring error of AFVISAR system must be studies in order to achieve accurate measure result. However, the existing theoretical research about this problem is inadequate.In this paper, firstly, the principle of AFVISAR is analyzed with Doppler frequency shift theory and the mathematic equations for acceleration calculating are concluded. The theoretical model of the measuring error is put forward by considering object moving direction bias angle and corresponding expression of the deviation is established. Then, an example is taken to illustrate the effect that the bias angle brings to acceleration calculation. In the following paragraph, the error creating by ignoring the second-order Doppler frequency shift is analyzed and the calculation formulas are demonstrated. Finally, the effect of the spectral characteristics of fiber laser are studied, and the relative error is calculated.

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Section: Introductionmentioning

confidence: 99%

Analysis of measuring error for AFVISAR system

Wang

Meng

2008

SPIE Proceedings

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“…[1][2][3][4][5][6][7][8] In a white-light measurement system, light from a low-coherence source, such as a light-emitting diode (LED), a superluminescent LED, or a broadband lamp, is transmitted to a single or multiplexed fiber sensors. A fringe pattern is produced by the light transmitted by or reflected from the sensor and recorded either spectrally by an optical spectrum analyzer (OSA) or temporally by a photodiode in a scanning interferometric system.…”

Section: Introductionmentioning

confidence: 99%

“…The fringe analysis approach most often used for white-light interferometers is the fringe peak tracking method, in which the peak position of a fringe or the fractional sample points between fringes in the interferogram are identified to determine the fringe order and to estimate the OPD of the sensor. [1][2][3][4][5] Although this fringe analysis method has been successfully used in many single interferometric sensor systems, it requires a high signal-tonoise ratio (SNR) to determine the fringe orders correctly and detect the peak positions accurately and cannot be directly applied to multiplexed sensor systems.…”

Section: Introductionmentioning

confidence: 99%

Frequency-estimation-based signal-processing algorithm for white-light optical fiber Fabry–Perot interferometers

2005

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A novel signal-processing algorithm based on frequency estimation of the spectrogram of single-mode optical fiber Fabry-Perot interferometric sensors under white-light illumination is described. The frequency-estimation approach is based on linear regression of the instantaneous phase of an analytical signal, which can be obtained by preprocessing the original spectrogram with a bandpass filter. This method can be used for a relatively large cavity length without the need for spectrogram normalization to the spectrum of the light source and can be extended directly to a multiplexed sensor system. Experimental results show that the method can yield both absolute measurement with high resolution and a large dynamic range. Performance analysis shows that the method is tolerant of background noise and variations of the source spectrum.

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“…For example usually white light single mode fiber interferometer provides stable and large signal to noise ratio while in the interferometers based on multi-mode fiber, cheaper optical components are employed (Song et al, 2001;Manojlovi et al, 2010). Generally there are several WLI topologies corresponding to the standard optical fiber interferometer and their combinations (Yuan, 2002;Mercado et al, 2001;). As an example Fig.…”

Section: White Light Fiber Interferometrymentioning

confidence: 99%