Accession Number:

ADA443824

Title:

The Infrared Spectral Signature of Water Ice in the Vacuum Cryogenic AI&T Environment

Descriptive Note:

Corporate Author:

AEROSPACE CORP EL SEGUNDO CA

Personal Author(s):

Report Date:

2005-12-31

Pagination or Media Count:

21.0

Abstract:

In a thermal vacuum testing of spacecraft sensors, water ice can condense on optical surfaces. The most common source of water vapor is out-gassing from multilayer insulationMLI. In the infrared, such ice films can significantly absorb radiation leading to lower performance of the sensor system. If chamber ice is heated, it normally sublimes vaporizes directly from the solid state at a temperature of around 150K. In an earlier paper aimed at the assembly, integration and test AIT environment, we outlined the behavior of ice using warm ice, i.e., ice not far below its melting temperature. In this report, we extend our previous report to include cryogenic ice deposits by presenting low-temperature ice transmission spectra in the 2-14 micrometers region as a function of thickness and temperature.

Subject Categories:

  • Atomic and Molecular Physics and Spectroscopy

Distribution Statement:

APPROVED FOR PUBLIC RELEASE