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Proceedings Paper • Open Access

Near- infrared imager and slitless spectrograph (NIRISS): a new instrument on James Webb Space Telescope (JWST)
Author(s): Michael Maszkiewicz

Paper Abstract

The James Webb Space Telescope (JWST) is a 6.5 m diameter deployable telescope that will orbit the L2 Earth–Sun point beginning in 2018. NASA is leading the development of the JWST mission with their partners, the European Space Agency and the Canadian Space Agency.

The Canadian contribution to the mission is the Fine Guidance Sensor (FGS). Originally, the FGS incorporated a flexible narrow spectral band science imaging capability in the form of the Tunable Filter Imaging Module –TFI, based on a scanning Fabry–Perot etalon. In the course of building and testing of the TFI flight model, numerous technical issues arose with unforeseeable length of required mitigation effort. In addition to that, emerging new science priorities caused that in summer of 2011 a decision was taken to replace TFI with a new instrument called Near Infrared Imager and Slitless Spectrograph (NIRISS). NIRISS preserves most of the TFI opto-mechanical design: focusing mirror, collimator and camera TMA telescopes, dual filter and pupil wheel and detectors but, instead of a tunable etalon, uses set of filters and grisms for wavelength selection and dispersion. The FGS-Guider and NIRISS have completed their instrument-level cryogenic testing and were delivered to NASA Goddard in late July 2012 for incorporation into the Integrated Science Instrument Module (ISIM).

Paper Details

Date Published: 20 November 2017
PDF: 6 pages
Proc. SPIE 10564, International Conference on Space Optics — ICSO 2012, 105642Q (20 November 2017); doi: 10.1117/12.2309161
Show Author Affiliations
Michael Maszkiewicz, Canadian Space Agency (Canada)

Published in SPIE Proceedings Vol. 10564:
International Conference on Space Optics — ICSO 2012
Bruno Cugny; Errico Armandillo; Nikos Karafolas, Editor(s)

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