Browse Prior Art Database

Fiber Optic Measuring Head for Surface Examination

IP.com Disclosure Number: IPCOM000048371D
Original Publication Date: 1982-Jan-01
Included in the Prior Art Database: 2005-Feb-08
Document File: 2 page(s) / 35K

Publishing Venue

IBM

Related People

Korth, HE: AUTHOR

Abstract

All optical information from a solid or liquid surface, e.g., color distribution, glare, scatter, fluorescence, refractive index, dispersion and coating film thickness, is extracted using a sample fiber-optic pick-up head to collect light emerging from the surface and to direct it to a spectrometer.

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Fiber Optic Measuring Head for Surface Examination

All optical information from a solid or liquid surface, e.g., color distribution, glare, scatter, fluorescence, refractive index, dispersion and coating film thickness, is extracted using a sample fiber-optic pick-up head to collect light emerging from the surface and to direct it to a spectrometer.

Pick-up head 1 on test surface 2 consists of a cylindrical tube with polished interior walls 3 acting as a cylindrical mirror for the illuminating light leaving the front end of fiber bundle 4 under different angles and with rotation symmetry about the fiber axis. The different angles of the illuminating light are obtained from light sources 5a, 5b, 5c with collecting lenses 6a, 6b, 6c, respectively, arranged with different off-sets from the fiber axis; color filters 7a, 7b, 7c associated with each light source can be used to color-encode the different illumination angles. Upon transmission in fiber bundle 4, the light maintains its angle with respect to the fiber axis but is distributed with rotational symmetry.

The light reflected from test surface 2 under different angles is picked up by a signal fiber 7 and directed to a polychromator 8 incorporating dispersing element 9 and opto-electronic converter 10, e.g., a photodiode array. The output signal of polychromator 8 is fed to a computer via line 11 for spectral analysis. The effective aperture of signal fiber 7 and of polychromator 8 is chosen such that only light...