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Estimating the relative shrinkage profile of newsprint
Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE).
Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE), Halmstad Embedded and Intelligent Systems Research (EIS), Laboratoriet för intelligenta system.
2003 (Engelska)Ingår i: Optical Engineering: The Journal of SPIE, ISSN 0091-3286, E-ISSN 1560-2303, Vol. 42, nr 5, s. 1467-1475Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

When water is removed from the paper during paper making, a dimensional change occurs in which the paper shrinks in the direction perpendicular to the direction of processing. The dimensional changes vary across the web and influence, e.g., the surface and compression properties of the paper; they also complicate the control of the paper machine. In this article, a robust method for estimating the relative shrinkage profile is presented. The method is based on a one-dimensional recording of the imprints from the forming fabric, using a fluorescence technique. The recording is transformed into a time-frequency spectrum, on which three different frequency estimators have been evaluated. In simulations on synthetic data and measurements on paper profiles the estimator that maximizes the correlation energy showed the most robust and accurate performance of the methods evaluated, even at a low signal-to-noise ratio.

Ort, förlag, år, upplaga, sidor
Redondo Beach, Calif.: SPIE, The International Society for Optical Engineering , 2003. Vol. 42, nr 5, s. 1467-1475
Nyckelord [en]
Fluorescence, Frequency estimators, Paper shrinkage, Simulations
Nationell ämneskategori
Teknik och teknologier
Identifikatorer
URN: urn:nbn:se:hh:diva-216DOI: 10.1117/1.1567260ISI: 000182985900041Scopus ID: 2-s2.0-0038380679Lokalt ID: 2082/511OAI: oai:DiVA.org:hh-216DiVA, id: diva2:237394
Tillgänglig från: 2006-11-24 Skapad: 2006-11-24 Senast uppdaterad: 2018-03-23Bibliografiskt granskad
Ingår i avhandling
1. Non-Invasive Multidimensional Imaging Applied on Biological Substances
Öppna denna publikation i ny flik eller fönster >>Non-Invasive Multidimensional Imaging Applied on Biological Substances
2002 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

This thesis presents the research and development of a microwave in-strument to capture tomographic information from the inner structure ofthe biological sample. The principle of the instrument is based on theanisotropy introduced by the fibres in materials such as wood and musclesin terms of information regarding changes in the fibre structure. The in-formation is presented as images representing the state of polarization us-ing Stokes parameters, the complex polarization ratio, and the ellipticityand the linear tilt angles. The theory of wave propagation in anisotropicmedia is discussed and related to the dielectric properties of wood. Ex-periments have shown that the developed instrument can be utilized invarious applications such as localizing knots and cavities in wood andto detect mechanical contamination of meat. A second instrument hasbeen improved by introducing a new signal analysis step to estimate therelative shrinkage profile of paper. The estimator is based on trackingfrequency variations in the joint time frequency spectrum and follows thelower bound of the problem for the relevant noise levels.

Ort, förlag, år, upplaga, sidor
Göteborg: Chalmers university of technology, 2002. s. 154
Serie
Doktorsavhandlingar vid Chalmers Tekniska Högskola, Ny serie, ISSN 0346-718X ; 1886
Nyckelord
Microwave propagation, Tomography, Polarimetry, Frequency estimation, Anisotropic media, Wood, Muscles, Paper
Nationell ämneskategori
Naturvetenskap
Identifikatorer
urn:nbn:se:hh:diva-2461 (URN)2082/2863 (Lokalt ID)91-7291-204-9 (ISBN)2082/2863 (Arkivnummer)2082/2863 (OAI)
Disputation
(Engelska)
Anmärkning

[Paper A] Kaestner, A.P. & Bååth, L.B., Microwave polarimetry based scanning for internal defects, Submitted to IEEE Transactions on Antennas and Propagation.

Scopus-ID: 2-s2.0-0036389438

Tillgänglig från: 2009-04-16 Skapad: 2009-04-16 Senast uppdaterad: 2018-09-11Bibliografiskt granskad

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Nilsson, Carl Magnus

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