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Proceedings Paper

Image Spectrograms Of Three-Dimensional Objects: Metrological Applications
Author(s): Alain Lacourt
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Paper Abstract

We propose an imagery device presenting a double particularity: (1) one of the axes of the image space is an axis of the temporal frequencies Ov; that is, the image is inscribed in a projection of the spectrum of the white light emanating from the object; (2) the image is anamorphosable at will. The light radiated by the achromatic object is dispersed by an auxiliary grating, then projected on the entrance slit of a spectroscope. The spectroscope, in again dispersing the chromatic components removed by the slit, reproduces a unique image of the object. By playing with the position of the auxiliary grating, for example, we arbitrarily modify the geometrical dispersion of the device; it results that the size of the image in one of its dimensions (that corresponding to the Ov axis) is anamorphosable at will. Besides the possibility of anamorphosis, the realization of image spectrograms opens interesting possibilities in metrology (absolute measurements of thickness, in particular).

Paper Details

Date Published: 18 April 1978
PDF: 4 pages
Proc. SPIE 0136, 1st European Conf on Optics Applied to Metrology, (18 April 1978); doi: 10.1117/12.956140
Show Author Affiliations
Alain Lacourt, University of Franche-Comte (France)

Published in SPIE Proceedings Vol. 0136:
1st European Conf on Optics Applied to Metrology
Michel H. Grosmann; Patrick Meyrueis, Editor(s)

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