Infrared Transmission of Contaminated Cryocooled Optical Windows
| Autor: | H. E. Scott, J. G. Pipes, A. M. Smith, J. A. Roux |
|---|---|
| Rok vydání: | 1978 |
| Předmět: |
Materials science
Annealing (metallurgy) business.industry Analytical chemistry Aerospace Engineering chemistry.chemical_element Germanium Substrate (electronics) Cryogenics Light scattering Optics Absorption edge chemistry Lattice (order) Infrared transmission Wavenumber Temperature sensitive Thin film business Refractive index |
| Zdroj: | AIAA Journal. 16:984-990 |
| ISSN: | 1533-385X 0001-1452 |
| DOI: | 10.2514/3.60993 |
| Popis: | Normal incidence transmission of germanium at 20, 80, 200, and 300 K is reported for wave numbers between 500 and 6700 cm -1 (about 1.5 to 20 ^m). The absolute transmission in the 1000 to 4000 cm ~ ! region, in the absorption edge region near 6700 cm" 1 , and in the lattice band region (500 to 800 cm" 1 ) was found to be temperature sensitive. At the cryogenic temperatures 20 and 80 K, the germanium window was employed as a substrate for the transmission study of thin solid films of NH3 , CO2, CO, CH4, and HC1. The spectral interval covered in the thin film study was 630 to 3700 cm ~ J . Degradation in the transmission of a cryocooled window contaminated by these condensed gases was measured and the complex refractive index extracted from the transmission versus film thickness data for 80 K solid NH3 . |
| Databáze: | OpenAIRE |
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