Actuator fault detection via electrical impedance testing

Rhonda M. Morgan; Keats Wilkie; Xiaoqi Bao; Erkin Sidick

doi:10.1117/12.734935

27 September 2007 Actuator fault detection via electrical impedance testing

Rhonda M. Morgan, Keats Wilkie, Xiaoqi Bao, Erkin Sidick

Proceedings Volume 6711, Advanced Wavefront Control: Methods, Devices, and Applications V; 67110A (2007) https://doi.org/10.1117/12.734935
Event: Optical Engineering + Applications, 2007, San Diego, California, United States

Abstract

Lead magnesium niobate (PMN) actuators are electrostrictive actuators with high dynamic range used in deformable mirrors. Actuator fault detection in deformable mirrors typically occurs through optical testing. We developed a nonoptical method for detecting actuator faults via low electric field resonance testing. The low electric field resonance method is standard practice for characterizing piezoelectric materials. The piezoelectric/electrostrictive coefficient couples the electrical and mechanical impedance of the actuator; a change in the mechanical boundaries (force) on the actuator results in a shift of the impedance resonances. We demonstrate experimentally that a PMN actuator can fracture but retain functionality under compression and that the fracture can be detected by measuring the impedance resonances at various bias voltages (various values of tension and compression). A concurrent optical test using a displacement interferometer was used to corroborate the results. We propose the impedance resonance approach as a non-optical fault detection test for in-situ actuators.

Citation Download Citation

Rhonda M. Morgan, Keats Wilkie, Xiaoqi Bao, and Erkin Sidick "Actuator fault detection via electrical impedance testing", Proc. SPIE 6711, Advanced Wavefront Control: Methods, Devices, and Applications V, 67110A (27 September 2007); https://doi.org/10.1117/12.734935

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