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Cryogenic Elaton
Program Directive
To design, fabricate, and test a spaceflight qualified tunable Fabry-Perot
etalon.
Program Description
Michigan Aerospace Corporation is presently contracted with NASA Langley
Spaceflight Center to design, fabricate and test a spaceflight qualified
tunable Fabry-Perot etalon. This device will be operated at 77 Kelvin
from 7 - 11 microns. Tuning is accomplished via this use of ferroelectric
single crystals and will provide a range of travel of approximately
20 microns at operating temperature. Zinc Selenide is used for all transmitting
elements. Titanium (Ti-6Al-5V Grade 5) is used for the etalon mount
due to its low density, high strength, and coefficient of thermal expansion.
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Cryogenic
Etalon Requirements and Parameters
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Parameter
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Desired
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Minimum
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Design Projected
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Wavelength
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9-12um
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-
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-
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Gap
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-
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-
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3.7mm
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Finesse
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20
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12
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19.3
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Transmission
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11%
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8%
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8.10%
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Resolution
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0.07 cm-1
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6.32 Angstroms at 9.5um
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6.32 Angstroms at 9.5um
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Reflectivity
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0.8
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0.6-0.9
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0.85
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Dynamic Range
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25um
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5um
(1/2 wavelength)
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20.5
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Free Spectral Range
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Maximize
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-
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12.2nm
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