NDLI: An innovative thermal balance test for Landsat-7 ETM+ instrument: cheaper, faster, unusual, successful

Content Provider	IEEE Xplore Digital Library
Author	Choi, M.K.
Copyright Year	1997
Description	Author affiliation: NASA Goddard Space Flight Center, Greenbelt, MD, USA (Choi, M.K.)
Abstract	A thermal balance test with cold vacuum chamber walls is needed at the instrument level for the Landsat-7 Enhanced Thematic Mapper Plus (ETM+) instrument. The initial approaches for the thermal balance test had significant impacts on the cost and schedule. This paper presents an innovative approach, which is cheaper, faster and better. It consists of two modifications to the baseline thermal vacuum (T/V) test profile, and will maintain the total test time in the vacuum chamber the same as the baseline. The first modification is to change the chamber wall temperature from 0/spl deg/C to -90/spl deg/C and enable the standby and safehold flight heaters during the 2.6-day radiative cooler cooldown to perform a cold thermal balance. The second modification is to reverse the order of 20% and 30% ETM+ duty cycles during orbital simulations in orbits 36 through 44, and change the chamber wall temperature from 0/spl deg/C to -90/spl deg/C and increase the duty cycle from 30% to 36% during orbital simulations in orbits 25 through 40 to perform a hot thermal balance. Reversing the order of 20% and 30% duty cycles in orbits 36 through 44 increases the time for 30% duty cycle continuous simulation by 0.3 day, and has a better chance of reaching a dynamic equilibrium. The innovative thermal balance test requires some extra test preparation time for adding kapton film heaters, kapton tape and a 0.0508 mm thick aluminized kapton cover to the Thematic Mapper Calibrator (TMC) test fixture.
Starting Page	1457
Ending Page	1462
File Size	667772
Page Count	6
File Format	PDF
ISBN	0780345150
DOI	10.1109/IECEC.1997.661984
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1997-07-27
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Testing Satellites Remote sensing Instruments Orbits Aerospace electronics Power dissipation Space heating Earth Insulation
Content Type	Text
Resource Type	Article

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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