A complete, self-contained fast-steering-mirror (FSM) mechanism is reported consisting of a housing, a mirror and mirror-mounting cell, three PZT (piezoelectric) actuators, and a counterbalance mass. Basically, it is a comparatively stiff, two-axis (tip-tilt), self-balanced FSM. Prior technology required two systems back-to-back on a center bulkhead, employing six opposing actuators, which must then be electronically balanced and recalibrated from time to time. The present invention requires only three (or three pairs for flight redundancy) actuators. If a PZT actuator degrades, the inherent balance remains, and compensation for degraded stroke is made by simply increasing the voltage to the PZT. Prior designs typically do not pivot at the mirror optical center, creating unacceptable beam shear.
This work was done by James D. Moore and Johnathan W. Carson of Caltech for NASA’s Jet Propulsion Laboratory. NPO-45985
This Brief includes a Technical Support Package (TSP).
Self-Balancing, Optical-Center-Pivot, Fast- Steering Mirror
(reference NPO-45985) is currently available for download from the TSP library.
Don't have an account?
Overview
The document is a Technical Support Package from NASA's Jet Propulsion Laboratory (JPL) concerning the Self-Balancing, Optical-Center-Pivot, Fast-Steering Mirror, identified by the NASA Tech Brief NPO-45985. It is intended to disseminate information about advancements in aerospace technology that may have broader scientific, technological, or commercial applications.
The document outlines the key features and components of the fast-steering mirror system, which is designed for precision optical applications. It includes a titanium housing that is lightweight, with a mass of approximately 1.2 kg, and incorporates athermal interface mounting feet to ensure stability and performance across varying temperatures. The mirror system is engineered for fine adjustments, allowing for six degrees of freedom (6 DOF) adjustments, which is crucial for maintaining optical alignment and performance in dynamic environments.
An exploded view of the assembly is provided, detailing components such as the titanium mirror cell, bonded PZT (piezoelectric transducer) elements, and a counterbalance weight. The PZT elements are integral to the system, enabling rapid and precise movements of the mirror, which is essential for applications requiring high-speed optical adjustments.
The document emphasizes the importance of compliance with U.S. export regulations, indicating that the information may contain proprietary data from Caltech/JPL. It also provides contact information for further inquiries, directing interested parties to the Innovative Technology Assets Management office at JPL.
Overall, this Technical Support Package serves as a resource for understanding the capabilities and applications of the Self-Balancing, Optical-Center-Pivot, Fast-Steering Mirror, highlighting its potential impact on various fields beyond aerospace, including commercial and scientific endeavors. The document reflects NASA's commitment to sharing technological advancements and fostering partnerships that can leverage these innovations for broader societal benefits.
