Instruments: Fine Guidance Sensor (FGS)
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The Fine Guidance Sensor is a very broadband guide camera that is incorporated
into the cryogenic instrument payload in order to meet the image motion requirements
of the JWST. This sensor is used for both "guide star" acquisition and fine
pointing. The sensor operates over a wavelength range of 1 to 5 micrometers
and has two HgCdTe detector arrays. Its field of view is sufficient to provide
a 95% probability of acquiring a guide star for any valid pointing direction.
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The Fine Guidance Sensor Tunable Filter Camera is a wide-field, narrow-band camera
that provides imagery over a wavelength range of 1.6 to 4.9 micrometers, with
a gap between 2.6 and 3.1 micrometers, via tunable Fabry-Perot etalons that
are configured to illuminate the detector array with a single order of interference
at a user-selected wavelength. The camera has a single HgCdTe detector array.
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Here is 15 second video clip of the Fine Guidance Sensor (FGS) model.
Formats: 5.7 MB .wmv
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For more information, please visit the FGS website at the Space Telescope Science Institute
http://www.stsci.edu/ngst/instruments/guider/
