Active Vibration Control of a Deployable Optical Telescope

Estimation of Phase and Diffusion: Combining Quantum Statistics and Classical Noise

“…It also plays a role in optic-fiber interferometric sensors [3] where thermal perturbations and mechanical strains can lead to measurable diffusion in both interferometric phase and polarisation of light. Shape sensors woven from fiber arrays embedded in aircraft wings subjected to turbulent airflow provide precursors to structural failure [4], as could similar sensors placed on instrument surfaces of deepspace telescopes exposed to solar heating and vibration [5]. In this paper, we explore quantum estimation of both phase and collective dephasing (or drift and diffusion parameters) as a step towards revealing advantages offered by quantum instruments and sensors in scenarios such as these.…”

Review on thermal and mechanical challenges in the development of deployable space optics

“…These mirrors were notable for their very lightweight design, owed to the use of a CFRP core and a thin ULE™ shell, which also acts as an active mirror. 46 This development program focused extensively on active vibration controllers 117 and the design of a very stiff deployment structure through the use of hybrid CFRP, including high and intermediate modulus fibers. 115 Several effective apertures of the telescope were reported throughout the technology development program, with a testbed of 1.7 m being built.…”

“…115 Several effective apertures of the telescope were reported throughout the technology development program, with a testbed of 1.7 m being built. 117 More system design options are discussed by Powers et al 118 for a baseline size of 5 to 6 m apertures flying on high altitudes, in the order of 15,000 km. The precise details of the final design could not be found as to its operating altitude or wavelength, though the latter is understood to be in the visible range.…”