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Apparatus for the electronic-digital measurement of gas pressure

  • US 3,902,355 A
  • Filed: 07/17/1973
  • Issued: 09/02/1975
  • Est. Priority Date: 07/31/1972
  • Status: Expired due to Term
First Claim
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1. An altimeter for measuring air pressure comprising an oscillator including a mechanical oscillating element surrounded by said air and whereof the frequency of oscillation is affected by the pressure of the air surrounding said oscillating element, a frequency-measuring means which measures the frequency of oscillation of the oscillator, and evaluating means which converts the measured frequency of oscillation into a value corresponding to the air pressure, said evaluating means comprising a distorting portion to which is fed an input signal whereof the frequency depends on the frequency of the oscillator, the distorting portion having a transmission characteristic curve approximating to a function by which altitude (H) depends on air pressure(p/p), so that the output signal of the distorting portion is a direct measure of the altitude (H).

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