论文信息 - Effect of cryocontaminants on cryogenic superpolished mirror and superpolished quartz crystal microbalance

Effect of cryocontaminants on cryogenic superpolished mirror and superpolished quartz crystal microbalance

Many systems contain cryogenic optical systems that operate at temperatures where gases such as nitrogen, oxygen, carbon dioxide, and water will condense. This study presents experimental results of the effects of these gases condensed on highly polished (superpolished) mirror surfaces cooled to temperatures as low as 15 K under vacuum conditions. Using these gases as contaminants, the bidirectional reflectance distribution function was obtained at a wavelength of 0.6328 micron for various contaminant film thicknesses up to 8 microns. Most of the data were obtained using as the mirror surface the superpolished sense crystal of a previously developed quartz crystal microbalance (SPQCM). The SPQCM allowed the mass of the actual contaminant layer to be measured directly.

Bob E. Wood | Bryan L. Seiber | Robert J. Bryson | Raymond P. Young | Deidra A. Dykeman

[1] P. Mueller,et al. Angular distribution of visible and near IR radiation reflected fromCO sub 2 cryodeposits , 1969 .

[2] F. E. Nicodemus. Directional Reflectance and Emissivity of an Opaque Surface , 1965 .

[3] R. P. Young. Metal-Optics Scatter Measurements , 1976, Optics & Photonics.

[4] Frederick Arnold. Degradation of Low-Scatter Metal Mirrors by Cryodeposit Contamination , 1975 .

[5] F. E. Nicodemus. Reflectance nomenclature and directional reflectance and emissivity. , 1970, Applied optics.

[6] F. E. Nicodemus,et al. Geometrical considerations and nomenclature for reflectance , 1977 .

[7] F Grum,et al. Optical sphere paint and a working standard of reflectance. , 1968, Applied optics.

[8] D. Wallace,et al. Realistic performance specifications for flight quartz crystal microbalance instruments for contamination measurement on spacecraft , 1988 .