Control strategy of LAROCA delay line

Michel Sghedoni; Jean Marc LeBlanc; Michel Dugue; Pierre Antonelli; Pascal Boucher

doi:10.1117/12.188875

4 October 1994 Control strategy of LAROCA delay line

Michel Sghedoni, Jean Marc LeBlanc, Michel Dugue, Pierre Antonelli, Pascal Boucher

Proceedings Volume 2264, Vibration Monitoring and Control; (1994) https://doi.org/10.1117/12.188875
Event: SPIE's 1994 International Symposium on Optics, Imaging, and Instrumentation, 1994, San Diego, CA, United States

Abstract

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.

Citation Download Citation

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); https://doi.org/10.1117/12.188875

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