Patent ID: 7927402
Filing Date: 2011-04-19
Classification: B01D

Abstract:
1. A method for removing moisture from an optical system including a pointer tracker head carried by an aircraft in which moisture accumulates on the inside of the pointer tracker head when the aircraft descends from a high altitude, comprising the steps of: providing a path from the ambient outside an aircraft through a desiccant to a pointer tracker head; and, permitting flow through the desiccant away from the pointer tracker head to the ambient when the aircraft leaves the ground such that when the aircraft ascends, air within the pointer tracker head is expelled through the path, making the air pressure in the head lower as the aircraft ascends, and such that upon aircraft descent air is ingested through the desiccant to fill the head, with resultant desiccated air filling the head due to the lower pressure in the head, thus to remove moisture from the head.