20 September 2002 Demodulation technique for interferometric phase with a one-dimensional discrete Hilbert transform
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Abstract
The demodulation scheme by using a discrete Hilbert transform that can change the interferometric phase by π/2 has been investigated. In-quadrature components of a fringe pattern are obtained from one captured interferogram by using a one-dimensional (1-D) discrete Hilbert transform and a 1-D discrete high-pass filtering that are based on a digital signal processing technique. The phase distribution in the range of 15π[rad] can be demodulated with the proposed method. The 1-D discrete Hilbert transform can be extended to two-dimensional calculation with a raster sampling procedure.
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Hiroto Watanabe, Hiroto Watanabe, Ribun Onodera, Ribun Onodera, Yukihiro Ishii, Yukihiro Ishii, } "Demodulation technique for interferometric phase with a one-dimensional discrete Hilbert transform", Proc. SPIE 4919, Advanced Materials and Devices for Sensing and Imaging, (20 September 2002); doi: 10.1117/12.465828; https://doi.org/10.1117/12.465828
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