MIR Environmental Effects Payload
(MEEP) Archive System

NASA Langley Research Center
Hampton, Virginia

POSA II - Passive Optical Sample Assembly II
   30-Day, Post-Retrieval Report

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The objective of the Passive Optical Sample Assembly II (POSA II) experiment is to assess the magnitude of molecular contamination on International Space Station (ISS) critical surfaces and quantify the performance and degradation rate of candidate/baseline ISS exterior surface materials. POSA II will provide environmental effects information that can be utilized to avoid cost overruns necessitated by unscheduled replacement of degraded on-orbit hardware. The POSA II experiment consists of various passive sample trays, carousels, and plates, as well as vacuum ultraviolet diodes and atomic-oxygen pinhole cameras. Many of the various materials chosen for exposure are currently planned for use on the ISS. The POSA II experiment is performed by the Boeing Defense and Space Group.

POSA II Photos
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POSA II POSA II Deployed POSA II Deployed
posa2.gifposa2_deploy.gif posa2_deploy2.gif

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Technical content for the MIR Environmental Effects Payload (MEEP) Web site was provided by Greg Stover. Please address comments regarding the technical content to g.stover@larc.nasa.gov.

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