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Continuously monitoring ratiometer

  • US 3,981,586 A
  • Filed: 05/19/1975
  • Issued: 09/21/1976
  • Est. Priority Date: 05/19/1975
  • Status: Expired due to Term
First Claim
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1. Apparatus for continuously monitoring a ratio between two time-varying signals, comprising:

  • a first integrator for the signal relating to the denominator of the ratio;

    a second integrator for the signal relating to the numerator of the ratio;

    chopper means for applying each of the signals to said corresponding integrator;

    sample and hold means for storing the output of said first integrator;

    said sample and hold means having the output thereof connected to the input of said second integrator;

    timer means for measuring the elapsed interval between when output from said sample and hold means is applied to said second integrator and when output from said second integrator transgresses through a reference level;

    reset means for returning said timer means and each said integrator to reference levels;

    a frequency generator; and

    logic means for controlling said chopper means, the output from said sample and hold means, and said reset means in synchronized intervals with the cycles of said frequency generator, said chopper means being controlled to apply the signals to said integrators for at least one frequency cycle, the output from said sample and hold means being controlled for connecting to said second integrator only after integration of the numerator signal has been completed thereby, and said reset means being controlled to establish the reference levels only after the elapsed interval in proportion to the ratio of the signals has been measured by said timer means.

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