Focal Plane Actuation to Achieve Ultra-High Resolution on Suborbital Balloon Payloads

Project: Research project

Description

Over the past few years there has been remarkable success flying imaging telescope systems suspended from suborbital balloon payload systems. These imaging systems have covered optical, ultraviolet, sub-millimeter and infrared passbands (i.e. BLAST, STO, SBI, Fireball and others). In recognition of these advances NASA is now considering ambitious programs to promote Planetary imaging from high altitude at a fraction of the cost of similar fully orbital systems. The challenge with imaging from a balloon payload is delivering the full diffraction-limited resolution of the system from a moving payload. Good progress has been made with damping mechanisms and oscillation control to remove most macroscopic movement in the departures of the imaging focal plane from a static configuration, a jitter component remains that is difficult to remove using external corrections. This proposal will demonstrate in the laboratory the utility and performance of actuating a detector focal plane (of whatever type) to remove the final jitter terms using an agile hexapod design. The input to this demonstration will be the jitter signal generated by the pointing system of a previously flown balloon mission. Our group has a mature jitter compensation system that thermally isolates the control head from the focal plane itself. This allows the hexapod to remain at ambient temperature in a vacuum environment with the focal plane cooled to cryogenic temperatures. Our lab design will mount the focal plane on the hexapod in a custom cryostat and deliver an active optical stimulus together with the corresponding jitter signal and use the actuation of the hexapod to correct for the departures from a static, stable configuration. We believe this demonstration will make the case for inclusion of this technological solution in future balloon-borne imaging systems requiring ultra-high resolution.
StatusFinished
Effective start/end date11/4/1311/3/15

Funding

  • NASA: Armstrong Flight Research Center: $249,999.00

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balloons
actuation
payloads
vibration
high resolution
fireballs
cryostats
high altitude
cryogenic temperature
configurations
stimuli
ambient temperature
proposals
damping
flight
telescopes
inclusions
costs
orbitals
vacuum