10 August 2010 Characterization of the tunable filter imager etalon on the JWST Fine Guidance Sensor
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The Fine Guidance Sensor (FGS) on the James Webb Space Telescope (JWST) has a science observing capability provided by the Tunable Filter Imager (TFI). The TFI incorporates dielectric coated Fabry-Perot etalon plates with a small vacuum gap. The separation of the plates is controlled by the Etalon Control Electronics (ECE) board, using piezoelectric actuators (PZTs) and capacitive displacement sensors (CDS). The TFI measures over the wavelength range of 1.6 to 4.9 microns with a spectral resolution of R~100. We present the key components of the etalon system and the approach for characterizing and testing the system. Initial results from assembly-level testing are also presented.
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Craig S. Haley, Craig S. Haley, Clinton Evans, Clinton Evans, Eric Grant, Eric Grant, Rodney Norman, Rodney Norman, Zeljko Osman, Zeljko Osman, Neil Rowlands, Neil Rowlands, Niladry Roy, Niladry Roy, Alan Scott, Alan Scott, Driss Touahri, Driss Touahri, } "Characterization of the tunable filter imager etalon on the JWST Fine Guidance Sensor", Proc. SPIE 7731, Space Telescopes and Instrumentation 2010: Optical, Infrared, and Millimeter Wave, 77313L (10 August 2010); doi: 10.1117/12.857906; https://doi.org/10.1117/12.857906


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