dorsal/arxiv
View SchemaAnalyzing laser-plasma interferograms with a Continuous Wavelet Transform Ridge Extraction technique: the method
| Authors | P. Tomassini, A. Giulietti, L. A. Gizzi, M. Galimberti, D. Giulietti, M. Borghesi, O. Willi |
|---|---|
| Categories | |
| ArXiv ID | physics/0111140 |
| URL | https://arxiv.org/abs/physics/0111140 |
| DOI | 10.1364/AO.40.006561 |
| Journal | Appl. Optics 40, 35 (2001) |
Abstract
Laser-plasma interferograms are currently analyzed by extracting the phase-shift map with FFT techniques (K.A.Nugent, Applied Optics {\bf 18}, 3101 (1985)). This methodology works well when interferograms are only marginally affected by noise and reduction of fringe visibility, but it can fail in producing accurate phase-shifts maps when dealing with low-quality images. In this paper we will present a novel procedure for the phase-shift map computation which makes an extensive use of the Ridge Extraction in the Continuous Wavelet Transform (CWT) framework. The CWT tool is {\it flexible} because of the wide adaptability of the analyzing basis and it can be very {\it accurate} because of the intrinsic noise reduction in the Ridge Extraction. A comparative analysis of the accuracy performances of the new tool and the FFT-based one shows that the CWT-based tool phase maps are considerably less noisy and it can better resolve local inhomogeneties.
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"abstract": "Laser-plasma interferograms are currently analyzed by extracting the\nphase-shift map with FFT techniques (K.A.Nugent, Applied Optics {\\bf 18}, 3101\n(1985)). This methodology works well when interferograms are only marginally\naffected by noise and reduction of fringe visibility, but it can fail in\nproducing accurate phase-shifts maps when dealing with low-quality images.\n In this paper we will present a novel procedure for the phase-shift map\ncomputation which makes an extensive use of the Ridge Extraction in the\nContinuous Wavelet Transform (CWT) framework. The CWT tool is {\\it flexible}\nbecause of the wide adaptability of the analyzing basis and it can be very {\\it\naccurate} because of the intrinsic noise reduction in the Ridge Extraction.\n A comparative analysis of the accuracy performances of the new tool and the\nFFT-based one shows that the CWT-based tool phase maps are considerably less\nnoisy and it can better resolve local inhomogeneties.",
"arxiv_id": "physics/0111140",
"authors": [
"P. Tomassini",
"A. Giulietti",
"L. A. Gizzi",
"M. Galimberti",
"D. Giulietti",
"M. Borghesi",
"O. Willi"
],
"categories": [
"physics.plasm-ph",
"physics.optics"
],
"doi": "10.1364/AO.40.006561",
"journal_ref": "Appl. Optics 40, 35 (2001)",
"title": "Analyzing laser-plasma interferograms with a Continuous Wavelet Transform Ridge Extraction technique: the method",
"url": "https://arxiv.org/abs/physics/0111140"
},
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