Measuring and testing – Barometer – Aneroid
Patent
1985-04-19
1987-05-19
Woodiel, Donald O.
Measuring and testing
Barometer
Aneroid
73701, 73705, 73723, 73729, 250231P, 356358, G01L 706, G01L 900
Patent
active
046657479
ABSTRACT:
Aircraft instrument for indicating air pressure, air pressure rate of change and accelerations of the aircraft movement based on the use of an optical laser interferometer. The air pressure is connected to one of several mirrors in the interferometer which causes the interference pattern to move up or down in response to the change in air pressure or acceleration. The interferometer uses a laser beam projected onto an optical detector that senses the motion of the interference pattern and produces a corresponding electrical signal which is connected to a linear motor which in turn is linked to the same mirror but in a negative feed-back arrangement that seeks to restore the position of the interference pattern. The amplifier output is an electrical analog of the atmospheric air pressure. The rate-of-climb is obtained by differentiating the amplifier output. The acceleration is produced by connecting the mirror to a mass.
REFERENCES:
patent: 2817238 (1957-12-01), Soehngen
patent: 3040583 (1962-06-01), Post
patent: 3387494 (1968-06-01), Golay
patent: 3590640 (1971-07-01), Cindrich
patent: 3622791 (1971-11-01), Bernard
patent: 3625062 (1971-12-01), Heske
patent: 3842353 (1974-10-01), Stewart
patent: 4160600 (1979-07-01), Lake
patent: 4403512 (1983-09-01), Nakahama
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