28 June 2006 VLTI-PRIMA fringe tracking testbed
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Abstract
One of the key components of the planned VLTI dual feed facility PRIMA is the Fringe Sensor Unit (FSU). Its basic function is the instantaneous measurement of the Optical Path Difference (OPD) between two beams. The FSU acts as the sensor for a complex control system involving optical delay lines and laser metrology with the aim of removing any OPD introduced by the atmosphere and the beam relay. We have initiated a cooperation between ESO and MPE with the purpose of systematically testing this Fringe Tracking Control System in a laboratory environment. This testbed facility is being built at MPE laboratories with the aim to simulate the VLTI and includes FSUs, OPD controller, metrology and in-house built delay lines. In this article we describe this testbed in detail, including the environmental conditions in the laboratory, and present the results of the testbed subsystem characterisation.
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Roberto Abuter, Roberto Abuter, Sebastian Rabien, Sebastian Rabien, Frank Eisenhauer, Frank Eisenhauer, Johannes Sahlmann, Johannes Sahlmann, Nicola Di Lieto, Nicola Di Lieto, Marcus Haug, Marcus Haug, Anders Wallander, Anders Wallander, Samuel Lévêque, Samuel Lévêque, Serge Ménardi, Serge Ménardi, Françoise Delplancke, Françoise Delplancke, Nicolas Schuhler, Nicolas Schuhler, Stefan Kellner, Stefan Kellner, Robert Frahm, Robert Frahm, "VLTI-PRIMA fringe tracking testbed", Proc. SPIE 6268, Advances in Stellar Interferometry, 62682Y (28 June 2006); doi: 10.1117/12.671318; https://doi.org/10.1117/12.671318
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