Solid state accumulating altimeter

  • US 4,694,694 A
  • Filed: 01/06/1986
  • Issued: 09/22/1987
  • Est. Priority Date: 01/06/1986
  • Status: Expired due to Term
First Claim
Patent Images

1. A solid state altimeter device, comprising:

  • an integrated circuit solid state pressure sensor including a deformable silicon diaphragm with a semiconductor strain gauge in the diaphragm;

    a vacuum chamber operatively attached to the diaphragm such that the vacuum of the vacuum chamber is applied to one side of the diaphragm, with the opposite side of the diaphragm exposed to atmospheric pressure;

    electrical means connected to the semiconductor strain gauge for conducting an analog signal from the strain gauge representing pressure difference between atmospheric and the vacuum chamber;

    a housing containing the pressure sensor and the vacuum chamber;

    microprocessor means in the housing for receiving the signal from the electrical means and for converting the signal into an altitude value;

    display means mounted in the housing and connected to the microprocessor means for displaying values as controlled by the microprocessor means, to a user;

    calibration means connected to the microprocessor means for enabling the user to manually calibrate the altimeter device to a reference value; and

    accumulator means included in the microprocessor means for accumulating altitude change in one direction, disregarding altitude changes in the opposite direction, for a selected interval, and including an accumulation display associated with the display means for displaying said altitude change in one direction.

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