Control of molecular contamination and outgassing of the SOFIE instrument

James Dyer; Jim Herrick; Andrew Shumway; Chad Fish; John Stauder; Scott Schicker; Tim Gordon

doi:10.1117/12.684109

7 September 2006 Control of molecular contamination and outgassing of the SOFIE instrument

James Dyer, Jim Herrick, Andrew Shumway, Chad Fish, John Stauder, Scott Schicker, Tim Gordon

Proceedings Volume 6291, Optical Systems Degradation, Contamination, and Stray Light: Effects, Measurements, and Control II; 62910F (2006) https://doi.org/10.1117/12.684109
Event: SPIE Optics + Photonics, 2006, San Diego, California, United States

Abstract

The Solar Occultation for Ice Experiment (SOFIE) instrument is one of three science instruments for the Aeronomy of Ice in the Mesosphere (AIM) mission. SOFIE is used to measure solar attenuation by mesospheric ice aerosols during each observatory sunrise and sunset using an 8-channel (16-detector) differential absorption radiometer. It directly views the sun and compares the near UV to the mid-IR spectral response during exo-atmospheric and endo-atmospheric measurements. Deposition of molecular films can degrade the reflectance and transmittance of SOFIE's optics. During on-orbit performance, it may be possible for the extended solar exposure to promote photochemical deposition and darkening effects in the UV. This paper will review the methods used to derive and verify contamination control budgets for particulate and molecular contamination during the fabrication and testing of the SOFIE instrument. Reported results include the molecular surface cleanliness throughout integration and test as well as outgassing measurements using internal and external quartz crystal microbalances. This information provides important baseline data for future correlation of instrument outgassing and potential photo-deposited contamination effects should they occur during on-orbit solar exposure

Citation Download Citation

James Dyer, Jim Herrick, Andrew Shumway, Chad Fish, John Stauder, Scott Schicker, and Tim Gordon "Control of molecular contamination and outgassing of the SOFIE instrument", Proc. SPIE 6291, Optical Systems Degradation, Contamination, and Stray Light: Effects, Measurements, and Control II, 62910F (7 September 2006); https://doi.org/10.1117/12.684109

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