Tuning the MAPS adaptive secondary mirror: actuator control, PID tuning, power spectra, and failure diagnosis

Jess A. Johnson; Amali Vaz; Manny Montoya; Katie M. Morzinski; Jennifer Patience; Suresh Sivanandam; Guido Brusa; Olivier Durney; Andrew Gardner; Olivier Guyon; Lori Harrison; Ron Jones; Jarron Leisenring; Jared Males; Bianca Payan; Lauren Perez; Yoav Rotman; Jacob Taylor; Dan Vargas; Grant West

doi:10.1117/12.3027714

7 October 2024 Tuning the MAPS adaptive secondary mirror: actuator control, PID tuning, power spectra, and failure diagnosis

Jess A. Johnson, Amali Vaz, Manny Montoya, Katie M. Morzinski, Jennifer Patience, Suresh Sivanandam, Guido Brusa, Olivier Durney, Andrew Gardner, Olivier Guyon, Lori Harrison, Ron Jones, Jarron Leisenring, Jared Males, Bianca Payan, Lauren Perez, Yoav Rotman, Jacob Taylor, Dan Vargas, Grant West

Author Affiliations +

Proceedings Volume 13149, Unconventional Imaging, Sensing, and Adaptive Optics 2024; 131490H (2024) https://doi.org/10.1117/12.3027714
Event: Optical Engineering + Applications, 2024, San Diego, California, United States

Abstract

The MMT Adaptive optics exoPlanet characterization System (MAPS) is currently in its engineering phase, operating on sky at the MMT Telescope. The MAPS Adaptive Secondary Mirror’s actuators are controlled by a closed loop modified PID control law and an open loop feed forward law, which in combination allows for faster actuator response time. An essential element of achieving the secondary’s performance goals involves the process of PID gain tuning. To start, we briefly discuss the design of the MAPS ASM and its actuators. We then describe the actuator positional control system and control law. Next, we discuss a few of the issues that make ASM tuning difficult. We then outline our initial attempts at tuning the actuator controllers, and discuss the use of actuator positional power spectra for both tuning and determining the health and failure states of individual actuators. We conclude by presenting the results of our latest round of tuning configuration trials, which have been successful at decreasing mirror latency, increasing operational mirror modes and improving image PSF.

Conference Presentation

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Jess A. Johnson, Amali Vaz, Manny Montoya, Katie M. Morzinski, Jennifer Patience, Suresh Sivanandam, Guido Brusa, Olivier Durney, Andrew Gardner, Olivier Guyon, Lori Harrison, Ron Jones, Jarron Leisenring, Jared Males, Bianca Payan, Lauren Perez, Yoav Rotman, Jacob Taylor, Dan Vargas, and Grant West "Tuning the MAPS adaptive secondary mirror: actuator control, PID tuning, power spectra, and failure diagnosis", Proc. SPIE 13149, Unconventional Imaging, Sensing, and Adaptive Optics 2024, 131490H (7 October 2024); https://doi.org/10.1117/12.3027714

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