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photonovore
Moonatic
Reged: 12/24/04
Posts: 2488
Loc: tacoma wa
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Re: What kind of compressed air?
07/01/08 11:10 AM
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The popular methods used by professionals (large observatories) are: 1) water flushing, 2) compressed air or nitrogen, 3) CO2 flushing. The last seems the preferred method vis a vis efficiency and lack of negatives. From the Subaru telescope (Mauna Kea Observatory) folk: "When liquid CO2 (-56.6C) is released out through a fine nozzle, it suddenly expands without exchanging heat (adiabatic expansion), becoming a mix of gaseous CO2 and dry ice. If we blow this mixture at the primary mirror, the dry ice wraps around the dust and both dust and ice are blown away from the mirror by the gaseous CO2. This method is called "CO2 Cleaning."
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Mardi
4" achromat, ETX-70.
Whitepeak Lunar Observatory Website
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