Resonant scanning mechanism

John Wallace; Mike Newman; Homero Gutierrez; Charlie Hoffman; Tim Quakenbush; Dan Waldeck; Christopher Leone; Miro Ostaszewski

doi:10.1117/12.2061069

7 October 2014 Resonant scanning mechanism

John Wallace, Mike Newman, Homero Gutierrez, Charlie Hoffman, Tim Quakenbush, Dan Waldeck, Christopher Leone, Miro Ostaszewski

Author Affiliations +

Proceedings Volume 9220, Infrared Sensors, Devices, and Applications IV; 92200C (2014) https://doi.org/10.1117/12.2061069
Event: SPIE Optical Engineering + Applications, 2014, San Diego, California, United States

Abstract

Ball Aerospace & Technologies Corp. developed a Resonant Scanning Mechanism (RSM) capable of combining a 250- Hz resonant scan about one axis with a two-hertz triangular scan about the orthogonal axis. The RSM enables a rapid, high-density scan over a significant field of regard (FOR) while minimizing size, weight, and power requirements. The azimuth scan axis is bearing mounted allowing for 30° of mechanical travel, while the resonant elevation axis is flexure and spring mounted with five degrees of mechanical travel. Pointing-knowledge error during quiescent static pointing at room temperature across the full range is better than 100 μrad RMS per axis. The compact design of the RSM, roughly the size of a soda can, makes it an ideal mechanism for use on low-altitude aircraft and unmanned aerial vehicles. Unique aspects of the opto-mechanical design include i) resonant springs which allow for a high-frequency scan axis with low power consumption; and ii) an independent lower-frequency scan axis allowing for a wide FOR. The pointing control system operates each axis independently and employs i) a position loop for the azimuth axis; and ii) a unique combination of parallel frequency and amplitude control loops for the elevation axis. All control and pointing algorithms are hosted on a 200-MHz microcontroller with 516 KB of RAM on a compact 3”×4” digital controller, also of Ball design.

Citation Download Citation

John Wallace, Mike Newman, Homero Gutierrez, Charlie Hoffman, Tim Quakenbush, Dan Waldeck, Christopher Leone, and Miro Ostaszewski "Resonant scanning mechanism", Proc. SPIE 9220, Infrared Sensors, Devices, and Applications IV, 92200C (7 October 2014); https://doi.org/10.1117/12.2061069

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KEYWORDS

Electroluminescence

Mirrors

Actuators

Scanners

Calibration

Sensors

Aerospace engineering

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