Gratien Bouillon

Etalonnage des lunettes autocollimatrices par interférométrie en lumière laser

Calibration of autocollimators is usually done using a sine bar. In this paper we describe an interferometric method in which only conventional metrological laboratory equipment is used, namely an helium–neon laser and a Michelson interferometer. The precision obtained is comparable for both interferometric and sine-bar methods. For comparison purposes, a very simple third calibration method has also been used. Here, a previously calibrated autocollimator serves as the reference. [Translated by the journal]

Métrologie de bancs d'optique. Application au cas particulier d'un spectromètre à réseau concave disposé selon le montage de Rowland

A new method is described for the alignment of the optical components in a Rowland concave grating spectrometer. The method is based on a system of optical mounts which have been specially designed to allow the rapid and precise substitution of calibration standards in place of the actual optical components. The calibration procedure describes the determination of the optimum position of the horizontal, coplanar, and vertical axes which minimize the errors in position and orientation of the optical components. The basic principles of the method are quite general and can be applied to many different situations.[Journal translation]

Contribution à l'analyse du profil de la section droite des solides de révolution

A mathematical technique using the Fourier series for analyzing the measured shape of the right section of a solid of revolution is proposed. The functions of the shape profile, the base circumference, and the base waviness permit the determination of the shape errors distribution; they permit also the determination of the bearing area curve and the shape parameters. The arithmetical average deviation is used as the parameter for assessing the irregularity of the shape profile.

Méthode d'orientation optimale d'un polygone optique par rapport à l'axe d'une table tournante

A procedure for the optimum orientation of an optical polygon is given. Such a procedure is recommended when an optical polygon is used for the calibration of instruments such as optical dividing heads and rotary tables. Theoretical formulas as well as numerical examples are given.