Diskriminierung textilrelevanter Tierhaare durch Fourieranalyse zweidimensionaler Oberflächenprofile

Scanning electron microscopy (SEM) is currently the most reliable method to identify animal fibres and to determine the composition of animal fibre mixtures. The SEM-analysis is time consuming and requires an operator experienced in animal fibre analysis. There is the need of objective criteria, which make it possible to evaluate the microscopic pictures in an automated process. One of the major problems is the detection of the edge heights of the cuticle scales. These are of particular significance for the differentiation of wool and speciality fibres. The approach pursued in this work is the analysis of two-dimensional fibre profiles, which potentially can be obtained in an automated process, either with profilometric methods or through edge detection in microscopic fibre photographs. Especially white-light interferometry , light microscopy and scanning electron microscopy are used. The profiles are submitted to Fourier-analysis and the obtained spectra are evaluated with regard to the height and length of the cuticle scales as well as to their variation. Models for animal fibre profiles are developed and analysed. This leads to parameters that facilitate the interpretation of the spectra of animal fibre profiles. One set of parameters, the area under the spectrum and the position of the main peak in the smoothed spectrum, is directly derived from the amplitude spectrum and relates to the height and length of the cuticle scales of the fibres. Another set of four parameters is obtained by fitting a symmetric distribution function to a spectrum which has a logarithmic frequency axis. This function is a mixture of the Gauß- and Lorentz-distribution. The four parameters relate to the height and length of the cuticle scales of the fibres as well as their variation. Within the context of a discriminant analysis, these parameters enable to quantitatively identify the composition of fibre mixtures. Taking into account the hit rate for single fibres, the composition of merino-cashmere mixtures can be determined with an error of 3%. The comparison of hit rates in the discriminant analysis shows no difference between white-light interferometry , light microscopy and scanning electron microscopy. The investigations have been conducted with merino wool with mean diameters of 17, 20, 24 and 31 µm, mohair as well as cashmere from China, Mongolia and Iran.

Grantor dc:publisher

Publikationsserver der RWTH Aachen University

Year dc:date

2006

Author dc:creator

• Zalfen, Udo

Contributors dc:contributor

• Höcker, Hartwig

• info:eu-repo/classification/ddc/540
• Chemie
• Tierhaar
• Wolle
• Kaschmir
• Fourieranalyse
• Diskriminanzanalyse
• Profilometrie
• Kantendetektion
• discriminant analysis
• Fourier analysis
• profilometry
• wool
• cashmere

Statement dc:rights

• info:eu-repo/semantics/openAccess

Language dc:language

ger

Identifier

https://publications.rwth-aachen.de/search?p=id:%22RWTH-CONV-123194%22

OAI identifier oai:identifier

oai:publications.rwth-aachen.de:61537