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Proceedings Paper

Optical delay line for stellar interferometer
Author(s): Bertrand Koehler; Emmanuel Manil
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Paper Abstract

One of the major design guidelines of the CHARON program (consisting of a cross shaped array of five 26 cm diameter telescopes allowing variable baselines up to 50 m) was to avoid the utilization of a laser metrology, principally for simplicity and cost reasons. The objective was to achieve a delay line whose vibration level during translation remains negligible, i.e., less tham 12 nm RMS for a 15 msec exposure time, without any measurement of the actual optical path length introduced by the delay line. The optical delay line is built around a 1-meter stroke, retail-market translation table whose carriage can move at speeds between 0.1 micron/sec and 1 mm/sec, while generating a low vibrational level. Results indicate that the performance values achieved were satisfactory for both optical and mechanical aspects.

Paper Details

Date Published: 1 July 1990
PDF: 10 pages
Proc. SPIE 1236, Advanced Technology Optical Telescopes IV, (1 July 1990); doi: 10.1117/12.19188
Show Author Affiliations
Bertrand Koehler, Aerospatiale (Germany)
Emmanuel Manil, Aerospatiale (France)

Published in SPIE Proceedings Vol. 1236:
Advanced Technology Optical Telescopes IV
Lawrence D. Barr, Editor(s)

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