Inner air-lock


The purpose of the inner air-lock is to shield the sensors behind the lock from the direct influence of rapid atmospheric pressure fluctuations. The inner air-lock was added in 2008/2009 in anticipation of the superconducting gravimeter.

The air-lock has a time constant of approximately four hours, meaning that pressure fluctuations with periods longer than 12 hours reach the instruments essentially unattenuated.

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