Contouring Of Tooth Imprints By Means Of A Fluorescence Technique Adapted To A Spatially Filtered Moire Illumination

Frans H. M. Jongsma; Paul Lambrechts; Guido Vanherle

doi:10.1117/12.966001

12 July 1983 Contouring Of Tooth Imprints By Means Of A Fluorescence Technique Adapted To A Spatially Filtered Moire Illumination

Frans H. M. Jongsma, Paul Lambrechts, Guido Vanherle

Author Affiliations +

Proceedings Volume 0361, Biostereometrics '82; (1983) https://doi.org/10.1117/12.966001
Event: 26th Annual Technical Symposium, 1982, San Diego, United States

Abstract

A technique has been developed to produce plane equidistant contouring surfaces on tooth-imprints. This technique consists of spatially filtering a negative obtained by photographing the imprint under a Moire illumination. Unfortunately this technique turned out to be very sensitive for a non-uniform surface reflectivity. To obtain an object-brightness depending only upon the contouring mechanism, the imprint has been coated with a fluorescent dye. A HeCd-laser (λ=422 nm) served as a lightsource for the projection of the Moire-interference pattern on the imprint. The radiation of the fluorescent coating (λ=530 nm) is used to form an image on the negative. In this way the surface with specular reflection properties is transformed into a Labertian surface. The spatial filtering technique allows multiple exposures of the final negative enabling an increased depth of field. Contour mappings with a resolution in depth of less than 10 μm have been obtained.

Citation Download Citation

Frans H. M. Jongsma, Paul Lambrechts, and Guido Vanherle "Contouring Of Tooth Imprints By Means Of A Fluorescence Technique Adapted To A Spatially Filtered Moire Illumination", Proc. SPIE 0361, Biostereometrics '82, (12 July 1983); https://doi.org/10.1117/12.966001

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KEYWORDS

Moire patterns

Coating

Diffraction

Optical filters

Diffraction gratings

Electronic filtering

Luminescence

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