Title
SPICA/SAFARI fourier transform spectrometer mechanism evolutionary design
Author
van den Dool, T.C.
Kruizinga, B.
Braam, B.C.
Hamelinck, R.F.M.M.
Loix, N.
van Loon, D.
Dams, J.
Publication year
2012
Abstract
TNO, together with its partners, have designed a cryogenic scanning mechanism for use in the SAFARI Fourier Transform Spectrometer (FTS) on board of the SPICA mission. SPICA is one of the M-class missions competing to be launched in ESA's Cosmic Vision Programme in 2022. JAXA leads the development of the SPICA satellite and SRON is the prime investigator of the Safari instrument. The FTS scanning mechanism (FTSM) has to meet a 35 mm stroke requirement with an Optical Path Difference resolution of less then 15 nm and must fit in a small volume. It consists of two back-to-back roof-top mirrors mounted on a small carriage, which is moved using a magnetic bearing linear guiding system in combination with a magnetic linear motor serving as the OPD actuator. The FTSM will be used at cryogenic temperatures of 4 Kelvin inducing challenging requirements on the thermal power dissipation and heat leak. The magnetic bearing enables movements over a scanning stroke of 35.5 mm in a small volume. It supports the optics in a free-floating way with no friction, or other non-linearities, with sub-nanometer accuracy. This solution is based on the design of the breadboard ODL (Optical Delay Line) developed for the ESA Darwin mission and the MABE mechanism developed by Micromega Dynamics. During the last couple of years the initial design of the SAFARI instrument, as described in an earlier SPIE 2010 paper, was adapted by the SAFARI team in an evolutionary way to meet the changing requirements of the SPICA payload module. This presentation will focus on the evolution of the FTSM to meet these changing requirements. This work is supported by the Netherlands Space Office (NSO).
Subject
Active magnetic bearings
Cryogenic
Fiber interferometer
Fourier transform spectrometer
Linear motor
Optical delay line
Spica/safari
High Tech Systems & Materials
Industrial Innovation
Mechatronics, Mechanics & Materials
OM - Opto-Mechatronics
TS - Technical Sciences
To reference this document use:
http://resolver.tudelft.nl/uuid:80a31673-963e-47fa-8964-4326cb021d80
TNO identifier
469150
Publisher
SPIE
ISBN
9780819491435
ISSN
0277-786X
Source
Space Telescopes and Instrumentation 2012, Optical, Infrared, and Millimeter Wave, 1-6 July 2012, Amsterdam, The Netherlands, 8442 (8442)
Series
Proceedings of SPIE - The International Society for Optical Engineering
Document type
conference paper