Control system of a dispersed fringe type sensing system of active optics

Yajun Zhang; Zhenchao Zhang; Yong Zhang

doi:10.1117/12.856342

5 August 2010 Control system of a dispersed fringe type sensing system of active optics

Yajun Zhang, Zhenchao Zhang, Yong Zhang

Proceedings Volume 7736, Adaptive Optics Systems II; 77364Q (2010) https://doi.org/10.1117/12.856342
Event: SPIE Astronomical Telescopes + Instrumentation, 2010, San Diego, California, United States

Abstract

Active optics plays an important part in segmented mirrors of astronomy telescopes. A dispersed fringe sensor(DFS) using a broadband point source is an efficient method for cophasing and is also highly automated and robust. DFS can estimate the piston between segments only through the spectrum formed by the transmissive grating's dispersion and therefore can replace the edge sensors. So we build an system in our lab to experiment the DFS method. The whole control system of DFS is put forward, including control of displacement actuators and control of shifting the optical fiber. Control of displacement actuators consists in industry computer, HY-6120 I/O card, six stepper motor and other parts. Some theoretical analysis and experiment tests reveal that the actuator could be controlled to 5nm and without backlash by this control strategy. The optical fiber could be shifted out of optical path or shifted in part or whole of optical path so that the spectrum formed by the transmissive grating's dispersion could alter. When six actuators are moving, the piston is changing, and the spectrum is also moving and altering. And the whole control of DFS system is constructed now and seems well. Further test and experiment will be carry out.

Citation Download Citation

Yajun Zhang, Zhenchao Zhang, and Yong Zhang "Control system of a dispersed fringe type sensing system of active optics", Proc. SPIE 7736, Adaptive Optics Systems II, 77364Q (5 August 2010); https://doi.org/10.1117/12.856342

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