Skip to main content
SearchLoginLogin or Signup

Metrology of an Adjustable X-ray Optic Segment with PZT Actuators

Presentation #103.17 in the session Missions and Instruments.

Published onJul 01, 2023
Metrology of an Adjustable X-ray Optic Segment with PZT Actuators

X-ray observatories are critical for studying a myriad of high-energy sources in the Universe. Proposed X-ray missions such as Lynx, AXIS, and STAR-X baseline telescopes with thin mirrors while achieving high angular resolution. Adjustable X-ray mirrors present one path to fabricate thin, highly sensitive mirrors over large areas. These mirrors maintain a precise optical figure through the use of piezoelectrically controlled actuators positioned on the convex (back) side of the mirror. Individually addressing these actuators applies a localized stress to the mirror’s surface, which can be used to deterministically correct for deformations induced during fabrication, mounting, gravity release, etc. We present on the capabilities of an adjustable X-ray mirror using lead titanate zirconate (PZT) actuators. The 10.16 cm × 10.16 cm mirror is a slumped glass segment which forms a conical approximation to a Wolter-I telescope and employs 288 lithographically traced actuator cells. Cells are capable of being individually supplied voltages. The response of these cell activations is captured using high precision interferometric measurements. We compare the responses predicted using finite-element analysis models with measured responses to establish the dynamic range of correctability for mirrors of this type.

No comments here