Solid state accumulating altimeter

Details Solid state accumulating altimeter Solid state accumulating altimeter

1986-01-06

1987-09-22

Woodiel, Donald O.

Measuring and testing

Barometer

Aneroid

73721, 73727, 73DIG4, 368 11, 368 14, G01L 712

Patent

active

046946942

ABSTRACT:
An altimeter device employs a solid state pressure sensor having a strain-sensitive element directly in a silicon diaphragm, which is connected at one side to a closed vacuum chamber. The entire device is very compact and may be in the form of a wristwatch. A display indicates altitude or relative altitude above or below a reference point to the user, and electronics associated with the device provide for accumulation of vertical change in one direction, regardless of intervening changes in the opposite direction. In this way, a skier, hiker or biker, for example, may determine total vertical drop or vertical rise encountered in a selected period, without regard to offset from movements in the opposite direction. At the same time, the user may also determine his altitude at any given point, and in a preferred form the altimeter device includes a clock and a time-averaging feature, for calculating and displaying rate of climb or descent, both instantaneous and average over a selected interval. The device may also have a time display, so that it functions as a wristwatch as well as an altimeter, and a synthesized voice output may be included for reporting data to the user's ear when visual observation of the display is not practical.

REFERENCES:
patent: 4030065 (1977-06-01), Bateman
patent: 4106343 (1978-08-01), Cook
patent: 4257112 (1981-03-01), Hubner
patent: 4279028 (1981-07-01), Lowdenslager et al.

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