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Absolute phase can be recovered by the fringe order maps.
This paper designs three color phase-coding fringes to determine the fringe order pixel by pixel.
The mapping rule is designed from the rounded phase values to the fringe order of each pixel.
The Tardy method was used to quantify the fringe order (n), that calculates the maximum shear stress value in each selected point.
First, the governing equations that relate to the CGS measurements and the elastic solution at mode I V-notch tip are derived in terms of the stress intensity factor, material constant, notch angle and fringe order.
Fig. 6 Connecting fringe order.
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With the two parts, relative phase and fringe orders, the absolute phase can be obtained directly.
Moreover, errors will not diffuse, because the relative phase and fringe orders are uncorrelated.
The fringe orders and the relative phase are calculated simultaneously, and this algorithm can circumvent the phase unwrapping process.
Moreover, this method can encode more fringe orders than composited two-frequency methods for the unwrapping processing of measurement phases map.
Color strips were used to mark each 2π phase-change period and three neighboring colors as a group were used as codewords to identify the fringe orders.
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