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Image Quality Control and Alignment of a Submillimeter Balloon-Borne Segmented Telescope (1997)

Ristorcelli, I. ; Lamarre, J.M. ; Giard, M. ; [et al.]

Springer

Experimental astronomy 7 (1997), S. 13-33

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ISSN: 1572-9508

Keywords: Submillimeter telescope ; Segmented mirror ; balloon-borne experiments ; space instrumentation

Source: Springer Online Journal Archives 1860-2000

Topics: Physics

Notes: Abstract PRONAOS is a balloon-borne system dedicated to astronomical observations in the submillimeter range (180µm - 1050µm) based on the use of a 2m Cassegrain telescope. The primary mirror consists of six CFRP (Carbon Fiber Reinforced Plastic) panels, each being positioned by three actuators. The rotation angles of the panels have been measured in the visible range with the help of a CCD and digital centroiding techniques that were necessary because of the light scattering on the CFRP mirror. The translation movements (along the optical axis) of the panels have been measured with an interference technique in the submillimeter range. Both visible and submillimeter measurements were also necessary to determine the alignment of the telescope - focal instrument system with the star sensor. The whole alignment process leads to a precision of ±8″ for the rotation angles and ±7µm for the translation of each panel, sufficient for a qualification of the system.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1023/A:1007979618534

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Analyseur de réponses neuronales a base de microprocesseur (1978)

Giard, M. H. ; Pernier, J. ; Bailly, G. ; [et al.]

Springer

Medical & biological engineering & computing 16 (1978), S. 425-428

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ISSN: 1741-0444

Keywords: Activité unitaire de neurones ; Micro-processeur

Source: Springer Online Journal Archives 1860-2000

Topics: Biology , Chemistry and Pharmacology , Medicine

Description / Table of Contents: Summary This relatively low-cost unit based on the microprocessor allows two post-stimulation chronohistogram to be built from individual neuron activities, and the results to be displayed on a screen and reproduced on a printout.

Abstract: Zusammenfassung Dieses relativ preiswerte Gerät, das auf einem Micro-Prozesor basiert, ermöglicht, daß zwei Post-Stimulations-Chronohistogramme aus individuellen Neuronentätigkeiten erstellt, und die Resultate auf einen Bildschirm projektiert und auf einem Druckbild reproduziert werden.

Notes: Sommaire D'un prix de revient relativement faible, cet appareil réalisé à base de micro-processeur permet de construire deux chronohistogrammes de post stimulation à partir d'activités unitaires de neurones, de visualiser les résultats sur un écran et de les éditer sur une table traçante.