Skytte, Jacob Lercke

I denne afhandling undersøger vi en nyligt introduceret optisk teknik, 2D Static Light Scattering (2DSLS). Teknikken er baseret på fjernmålinger, er ikke-invasiv, fleksibel og er potentielt velegnet til in-line proceskontrol. Desuden indeholder 2DSLS signalet informationer fra flere forskellige optiske fænomener, hvilket kan benyttes til at uddrage oplysninger om kemisk sammensætning og underliggende mikrostruktur af den undersøgte prøve.Hovedformålet i denne afhandling er at undersøge 2DSLS teknikken i forbindelse med mejeri applikationer. Dette omfatter forståelsen af de forskellige parametre i den eksperimentelle opstilling af teknikken, såvel som forståelsen af 2DSLS signalets potentiale og begrænsninger. Desuden undersøges forskellige metoder til at kvantificere signalet. Her bliver både etablerede fysiske modeller såvel som statistiske beskrivelser evalueret og diskuteret.Der lægges stor vægt på at bruge 2DSLS teknikken til at skelne mellem forskellige protein mikrostrukturer i yoghurt baserede produkter. Potentielt vil dette give mulighed for proceskontrol, i forhold til mikrostruktur, under yoghurt produktion. Da mikrostrukturen er en vigtig parameter for forbrugerens accept af yoghurt produkter, kan denne specifikke proceskontrol være særdeles gavnlig. For at få referencemålinger af den faktuelle mikrostruktur, undersøger vi hvordan mikroskopi billeder af yoghurt kan kvantificeres objektivt. Vi præsenterer hermed også et studie der sammenligner en række af forskellige deskriptorer af mikroskopi billedernes tekstur.Throughout this thesis we investigate a recently introduced optical technique denoted 2D static light scattering (2DSLS). The technique is remote sensing, non-invasive, highly flexible, and appears to be well suited for in-line process control. Moreover, the output signal contains contributions from several different optical phenomena, which can be utilised to provide information on chemical composition and underlying microstructure of an investigated sample. The main goal of this thesis is to provide an exploratory study of the 2DSLS technique in relation to dairy based applications. This includes getting an understanding of the various parameters in the setup as well as understanding the output signal in terms of potential and limitations. Furthermore, suitable ways of quantifying the signal are investigated. Here, both established physical models and statistical descriptions of the signal are evaluated and discussed. There is a major emphasis on using 2DSLS to discriminate between different protein microstructures in yogurt products. This potentially allows for process control, in relation to microstructure, during yogurt manufacture. As microstructure is critical for consumer acceptability, this specific process control can be highly beneficial. To provide suitable reference measures on the actual microstructure, we investigate how to quantify micrographs of yogurts objectively. We provide a comparative study, that includes a broad range of different image texture descriptors

Online Research Database In Technology

2D Static Light Scattering for Dairy Based Applications

http://orbit.dtu.dk/ws/files/99926968/phd333_Skytte_JL.pdf

2D Static Light Scattering for Dairy Based Applications

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Online Research Database In Technology