Abstract
The bandwidth of a servo controlling a deformable mirror should be determined by the time delays introduced by integration, read out, and analysis of the signals recorded by the wavefront detector. However, many types of piezoelectric actuators used in the construction of deformable mirrors exhibit considerable hysteresis which destabilizes the servo and requires a reduction in the stable system bandwidth. The effect of various degrees of hysteresis on the overall servo performance will be discussed together with methods of its compensation. These methods include `passive correction,' in which the effect of hysteresis is modeled by the servo system and `active correction,' in which the shape of the mirror is continuously measured with a wide bandwidth servo and is used as the error signal. We discuss both types of correction and present experimental results.
| Original language | English (US) |
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| Title of host publication | Proceedings of SPIE - The International Society for Optical Engineering |
| Editors | Mark A. Ealey, Fritz Merkle |
| Pages | 754-761 |
| Number of pages | 8 |
| Volume | 2201 |
| State | Published - Dec 1 1994 |
| Event | Adaptive Optics in Astronomy - Kailua, HI, USA Duration: Mar 17 1994 → Mar 18 1994 |
Other
| Other | Adaptive Optics in Astronomy |
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| City | Kailua, HI, USA |
| Period | 3/17/94 → 3/18/94 |
ASJC Scopus subject areas
- Electrical and Electronic Engineering
- Condensed Matter Physics