Error-free demodulation of pixelated carrier frequency interferograms
نویسندگان
چکیده
منابع مشابه
Robust phase demodulation of interferograms with open or closed fringes.
We present two robust algorithms for fringe pattern analysis with partial-field and closed fringes. The algorithm for partial-field fringe patterns is presented as a refinement method for precomputed coarse phases. Such an algorithm consists of the minimization of a regularized cost function that incorporates an outlier rejection strategy, which causes the algorithm to become robust. On the bas...
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We demonstrate a method to directly demodulate closed-fringe interferograms using a kind of active contour called a snake. This method can be used to demodulate a single closed-fringe interferogram when its background illumination and/or contrast terms have a spatial frequency similar to the spatial frequency of the equivalent normalized interferogram. Among other cases, this problematic usuall...
متن کاملPhase demodulation of interferograms with open or closed fringes
Analysis of fringe patterns with partial--field and/or closed fringes is still a challenging problem that requires the development of robust methods. This paper presents a method for fringe pattern analysis with those characteristics. The method is initially introduced as a phase refinement process for computed coarse phases, as those obtained from partial--field patterns with a full-field meth...
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A parametric method to carry out fringe pattern demodulation by means of a particle swarm optimization is presented. The phase is approximated by the parametric estimation of an nth-grade polynomial so that no further unwrapping is required. A particle swarm is used to optimize the input parameters of the function that estimates the phase. A fitness function is established to evaluate the parti...
متن کاملEffect of Carrier Frequency Offset on Frequency-Domain Differential Demodulation in OFDM Systems
This paper analyzes the effect of the carrier frequency offset on frequency-domain differential demodulation in orthogonal frequency division multiplexing (OFDM) systems. The exact signal-to-noise ratio (SNR) expression is derived in the presence of the frequency offset. Using this exact SNR expression, the SNR degradation due to the frequency offset is quantified and the symbol error rate (SER...
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ژورنال
عنوان ژورنال: Optics Express
سال: 2010
ISSN: 1094-4087
DOI: 10.1364/oe.18.018492