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Auto-tuned thermal control on stratospheric balloon experiments

Redmond, Susan and Benton, Steven J. and Brown, Anthony M. and Clark, Paul and Damaren, Christopher J. and Eifler, Tim and Fraisse, Aurelien A. and Galloway, Mathew N. and Hartley, John W. and Jauzac, Mathilde and Jones, William C. and Li, Lun and Luu, Thuy Vy T. and Massey, Richard J. and McCleary, Jacqueline and Netterfield, C. Barth and Rhodes, Jason D. and Romualdez, L. Javier and Schmoll, Jürgen and Tam, Sut-Ieng (2018) Auto-tuned thermal control on stratospheric balloon experiments. In: Ground-based and Airborne Telescopes VII. Proceedings of SPIE. No.10700. Society of Photo-optical Instrumentation Engineers (SPIE) , Bellingham, WA, Art. No. 107005R. ISBN 9781510619531. http://resolver.caltech.edu/CaltechAUTHORS:20181207-145745628

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Abstract

Balloon-borne experiments present unique thermal design challenges, which are a combination of those present for both space and ground experiments. Radiation and conduction are the predominant heat transfer mechanisms with convection effects being minimal and difficult to characterize at 35-40 km. This greatly constrains the thermal design options and makes predicting flight thermal behaviour very difficult. Due to the limited power available on long duration balloon flights, efficient heater control is an important factor in minimizing power consumption. SuperBIT, or the Super-Pressure Balloon-borne Imaging Telescope, aims to study weak gravitational lensing using a 0.5m modified Dall-Kirkham telescope capable of achieving 0.02" stability and capturing deep exposures from visible to near UV wavelengths. To achieve the theoretical stratospheric diffraction-limited resolution of 0.25", mirror deformation gradients must be kept to within 20 nm. The thermal environment must be stable on time scales of an hour and the thermal gradients on the telescope must be minimized. During its 2018 test-flight, SuperBIT will implement two types of thermal parameter solvers: one for post-flight characterization and one for in-flight control. The payload has 85 thermistors as well as pyranometers and far-infrared sensors which will be used post-flight to further understand heat transfer in the stratosphere. This document describes the in-flight thermal control method, which predicts the thermal circuit of components and then auto-tunes the heater PID gains. Preliminary ground testing shows the ability to control the components to within 0.01 K.


Item Type:Book Section
Related URLs:
URLURL TypeDescription
https://doi.org/10.1117/12.2312339DOIArticle
Additional Information:© 2018 Society of Photo-Optical Instrumentation Engineers (SPIE). SuperBIT is supported in Canada, via the Natural Sciences and Engineering Research Council (NSERC), in the USA via NASA award NNX16AF65G, and in the UK via the Royal Society and Durham University. Part of the research was carried out at the Jet Propulsion Laboratory (JPL), California Institute of Technology (Caltech), under a contract with NASA.
Funders:
Funding AgencyGrant Number
Natural Sciences and Engineering Research Council of Canada (NSERC)UNSPECIFIED
NASANNX16AF65G
Royal SocietyUNSPECIFIED
Durham UniversityUNSPECIFIED
NASA/JPL/CaltechUNSPECIFIED
Subject Keywords:balloon-borne, thermal control, wide field, visible-to-near-UV, stratosphere, auto-tune, PID gains
Record Number:CaltechAUTHORS:20181207-145745628
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20181207-145745628
Official Citation:Susan Redmond, Steven Benton, Anthony M. Brown, Paul Clark, Christopher J. Damaren, Tim Eifler, Aurelien A. Fraisse, Mathew N. Galloway, John W. Hartley, Mathilde Jauzac, William C. Jones, Lun Li, Thuy Vy Luu, Richard J. Massey, Jacqueline McCleary, C. Barth Netterfield, Jason D. Rhodes, L. Javier Romualdez, Jürgen Schmoll, Sut-Ieng Tam, "Auto-tuned thermal control on stratospheric balloon experiments," Proc. SPIE 10700, Ground-based and Airborne Telescopes VII, 107005R (6 July 2018); doi: 10.1117/12.2312339
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:91586
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:08 Dec 2018 00:15
Last Modified:08 Dec 2018 00:15

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