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Proceedings Paper

Optical coating for thermofluidodynamic experiments cuvettes in microgravity conditions: the technology and performances
Author(s): M. Tacconi; Germano Dionisio; M. Simoncini; P. G. Falciani
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Paper Abstract

The aim of the present paper is to present the results of a research, developed in Officine Galileo, on a special coating that is used on cuvettes for thermofluidodynamic experiments in Microgravity as on the BDPU (Bubbles Drops and Particles Unit), which will flight on the IML2 in June 1994, and on the Inex-Mam (Interactive Experiment on Marangoni Migration) module that has been launched with a Maser Sounding Rocket in November 1993. The very stringent optical and thermal requirements and the Microgravity environmental conditions led to the development of a multilayer coating on a quartz covette with a low reflectivity in the visible (< 1.5% at 633 nm and < 4.0% in the range 400-800 nm), a good reflectivity (> 80.0%) in the IR above 3.7 micrometers (this is the upper cut wavelength of Suprasil 300 Quartz, the cuvette materials), and an average transparency > 20.0% in the range of 0.8-3.7 micrometers . These performances allow to reach an extremely low IR emissivity (< 0.1 above 5.0 micrometers ) of the external cuvettes surfaces, but simultaneously allow a partial thermal images acquisition of the fluid surface within the cuvette (in the range 0.8-3.7 micrometers ) and the application of interferometric diagnostic systems in the visible range (PDI: Point Diffraction Interferometer at 633 nm). In the paper the achieved performances in the visible and thermal ranges are discussed with respect to the experiments cuvettes requirements, and a description of the used technology is given.

Paper Details

Date Published: 30 September 1994
PDF: 8 pages
Proc. SPIE 2210, Space Optics 1994: Space Instrumentation and Spacecraft Optics, (30 September 1994); doi: 10.1117/12.188126
Show Author Affiliations
M. Tacconi, Officine Galileo (Italy)
Germano Dionisio, Officine Galileo (Italy)
M. Simoncini, Officine Galileo (Italy)
P. G. Falciani, Officine Galileo (Italy)


Published in SPIE Proceedings Vol. 2210:
Space Optics 1994: Space Instrumentation and Spacecraft Optics
Thierry M. Dewandre; Joachim J. Schulte-in-den-Baeumen; Emmanuel Sein, Editor(s)

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