betsy.weaver@LIGO.ORG - posted 14:11, Monday 18 April 2011 - last comment - 14:15, Monday 18 April 2011(727)
Particulate Blow off
A MicroVac Portable ULPA Cleanroom Vacuum/Blower was purchased from Terra Universal. After Class B'ing a TFE hose, we confirmed that particle counts coming out of the exhaust and through the TFE hose were near zero (after making sure that surrounding dust wasn't being picked up and slewing the counts). Friday, we attempted to take some video/pictures of the blower hose blowing off particulate collected on a tabled QUAD UIM subassembly (see attached pictures). The field of view of the surface in the video is on the order of a few square inches.
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A different round of blowing in a different location of a UIM.
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It's a bit difficult to quantify how much particulate is being removed, but it is clear from the photos/video that a significant portion of the macroscopic stuff is being removed.