Optics: measuring and testing – By dispersed light spectroscopy – Utilizing a spectrometer
Patent
1983-05-11
1985-12-24
Willis, Davis L.
Optics: measuring and testing
By dispersed light spectroscopy
Utilizing a spectrometer
356 73, 356359, 356366, G01B 902
Patent
active
045602778
ABSTRACT:
Disclosed is a process for the qualitative and quantitative measurement of irregularities and impurities on and in transparent or semitransparent flexible sheet materials, comprising the steps of producing interference fringes by obliquely directing a light beam onto the surface of a sheet to be examined to produce two partial beams; placing the sheet to be examined on a reflecting reference surface and forming the partial beams by reflection from this reference surface and from the surface to be examined; superposing the two partial beams, whereby an interference field is obtained which is equivalent to the surface profile of the sheething to be examined; evaluating the interference field to determine the extension of the surface profile; additionally irradiating the sheet by a polarized light beam; passing the polarized light beam through a second polarizer; and evaluating the polarized light beam after passing through the second polarizer. Also disclosed is an apparatus for carrying out this process.
REFERENCES:
patent: 3359852 (1967-12-01), Wilczynski et al.
patent: 4367951 (1983-01-01), Hammon
Hoechst Aktiengesellschaft
Koren Matthew W.
Willis Davis L.
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