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Noliac bending actuator rings have the potential to provide solutions to control mirror deformations and are being used in the UK Astronomy Technology Centre’s proof-of-concept deformable mirror.

A giant telescope design is being developed by the European Southern Observatory, which will, it is claimed, revolutionise understanding of the universe and its origins.

The design of the giant telescope comprises an array of almost 1,000 mirrors to form a 42m-diameter primary.

It also includes adaptive optics as part of the telescope, which will allow astronomers to correct the images for the twinkling caused by the turbulence of the Earth’s atmosphere.

The deformable mirror design takes advantage of the fast, millisecond response time of piezo in correcting for atmospheric distortions and can accurately manipulate the mirror surface to sub-micron resolution.

The good displacement range of the ring bending actuator enables tens of microns of displacement, sufficient to have a considerable impact on reducing other residual errors relating to the telescope error budget.

A matrix consisting of ring bending actuators on a 30mm pitch are bonded to the underside of the mirror and provide a compact assembly.

The multi-layer design of the actuator enables the required distortive force to be achieved at a sufficiently low voltage that the drive electronics design is simplified, and the bias voltage applied to the actuator considerably simplifies the mechanical design of the support.

The design has provision for displacement sensing, which will be used to reduce the hysteresis of the system to less than one per cent (piezo actuators typically have a 10 per cent hysteresis).

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