NDLI: Application of Decentralized Control to a Laser Alignment System

Content Provider	IEEE Xplore Digital Library
Author	Long, Theresa W. Bliss, Erlan S.
Copyright Year	1992
Description	Author affiliation: Laser Technology Program, L-463, Lawrence Livermore National Laboratory, Livermore, CA, 94551 (Long, Theresa W.; Bliss, Erlan S.)
Abstract	Light propagating through a large laser system is subject to numerous perturbations which can cause deviations from the desired path. Closed loop alignment controls are typically located at key points to compensate for such errors. We have tested a decetralized approach to the alignment control of such a laser system. The decentralized control system has a modular structure in which the control command for each subsystem is a function of only two errors, the error detected by that subsystem's own sensor and the error detected by the sensor in the preceding subsystem. Therefore, although the controller uses local information, the whole alignment system can operate in a coordinated fashion. On the other hand, any design change of a subsystem will cause redesign of only one additional controller, the one for the subsystem immediately downstream. The rest of the system remains unchanged, as we verified in the laboratory by disabling one control loop to simulate a change in the subsystem. The control accuracy of the whole system remained the same after the controller downstream of the disabled loop was modified. This modular approach increases design flexibility and facilitates future expansion of the system.
Starting Page	1623
Ending Page	1627
File Size	457243
Page Count	5
File Format	PDF
ISBN	0780302109
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1992-06-24
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	American Automatic Control Council(AACC)
Subject Keyword	Distributed control Control systems Centralized control Optical control Error correction Laboratories Large-scale systems Laser theory Laser beams Mirrors
Content Type	Text
Resource Type	Article

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