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Proceedings Paper

Design and performance of a small two-axis high-bandwidth steering mirror
Author(s): Gregory C. Loney
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Paper Abstract

A two-axis, high-bandwidth, small-aperture steering mirror called the High Bandwidth Steering Mirror (HBSM) has been designed, fabricated, and tested. The mirror/mechanism prototype functions within a servo loop either scanning a field of view or tracking a radiation source. The design focused on elements making up the beam-steering mechanism: mirror, restoring flexures, actuators, position sensors, and encompassing housing, and the part each component plays in making a mechanical system suitable for high-bandwidth operation. Inclusion of a novel flexural support allows one-degree peak-to-peak angular stroke (shaft space) at low frequencies and a small-signal closed-loop bandwidth of up to 10 kHz without the usual mechanical resonance-induced loop instabilities. This increased bandwidth allows substantial rejection of a disturbance spectrum in the 10-1000 Hz range and execution of fast, complex scan patterns. Pointing accuracies of 0.2 micronrad have been achieved in the laboratory. Details of the mechanical design and fabrication issues as well as the control-loop implementation are discussed. Test data are presented along with reports of the mirror's performance in use as an extended sensor.

Paper Details

Date Published: 1 February 1991
PDF: 9 pages
Proc. SPIE 1454, Beam Deflection and Scanning Technologies, (1 February 1991); doi: 10.1117/12.28030
Show Author Affiliations
Gregory C. Loney, Lincoln Lab./MIT (United States)


Published in SPIE Proceedings Vol. 1454:
Beam Deflection and Scanning Technologies
Leo Beiser; Gerald F. Marshall, Editor(s)

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