Optical delay line nanometer-level pathlength control law design for space-based interferometry

Robert L. Grogan; Gary H. Blackwood; Robert J. Calvet

doi:10.1117/12.317176

24 July 1998 Optical delay line nanometer-level pathlength control law design for space-based interferometry

Robert L. Grogan, Gary H. Blackwood, Robert J. Calvet

Proceedings Volume 3350, Astronomical Interferometry; (1998) https://doi.org/10.1117/12.317176
Event: Astronomical Telescopes and Instrumentation, 1998, Kona, HI, United States

Abstract

This article is concerned with the discussion of a control law design for a brassboard optical delay line (ODL) developed for the interferometry technology program at the JPL to support the space-based optical interferometry missions. Variations on the ODL brassboard design will be flown on the space interferometry mission and new millennium separated spacecraft interferometer. The brassboard ODL was designed to meet both the performance and environmental requirements for space interferometry. A control experiment was contrived to evaluate how well the brassboard optical delay line can control optical pathlength jitter. Fringe visibility resolution requirements for space interferometry prescribe that the optical pathlength from the two collecting telescope apertures must be equal and stable to within a few nanometers RMS. This paper describes the classical frequency domain lop shaping techniques that were used to design a control law for the experiment. Included is a description of a methodology for managing the control authority for the three actuation stages of the ODL, as well as, an input shaping technique for handling the large dynamic range issues. Experimental performance results characterizing closed loop control of residual optical jitter in an ambient laboratory environment are reported.

Citation Download Citation

Robert L. Grogan, Gary H. Blackwood, and Robert J. Calvet "Optical delay line nanometer-level pathlength control law design for space-based interferometry", Proc. SPIE 3350, Astronomical Interferometry, (24 July 1998); https://doi.org/10.1117/12.317176

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