1 July 1990 Optical delay line for stellar interferometer
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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.
© (1990) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Bertrand Koehler, Emmanuel Manil, "Optical delay line for stellar interferometer", Proc. SPIE 1236, Advanced Technology Optical Telescopes IV, (1 July 1990); doi: 10.1117/12.19188; https://doi.org/10.1117/12.19188


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