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4 October 1994 Control strategy of LAROCA delay line
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The 3-meter stroke `LAROCA' Delay Line (DL) was designed, built and tested in France in 1993, with full success in terms of performance and of length and loading scalability. The highly stringent stability requirements in delay line motion led to devise an original guiding and motorizing concept that affords outstanding displacement accuracy, minimizing lateral and, more importantly, longitudinal vibrations. LAROCA's architecture hinges on a two-stage concept: a high-precision upper carriage, for precision positioning, controlled for longitudinal vibration compensation by a high-bandwidth, hybrid analog/digital controller, and a less accurate lower carriage for global DL translation on a two-cylindrical-rail track using a classical position control system. Excellent interstage decoupling, using a contactless suspension, yields long-stroke capability together with the required stability of the high- precision stage. After a presentation of the LAROCA project requirements and an overview of the general architecture, this paper describes the overall servo-control subsystem. Finally some important results are presented.
© (1994) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Michel Sghedoni, Jean Marc LeBlanc, Michel Dugue, Pierre Antonelli, and Pascal Boucher "Control strategy of LAROCA delay line", Proc. SPIE 2264, Vibration Monitoring and Control, (4 October 1994);

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