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JUNCTION RANGE FINDER

  • US 3,732,567 A
  • Filed: 09/21/1970
  • Issued: 05/08/1973
  • Est. Priority Date: 09/21/1970
  • Status: Expired due to Term
First Claim
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1. Apparatus for locating an electrically nonlinear object comprising:

  • A. means for generating a frequency modulated exciting signal of a predetermined fundamental frequency;

    B. a transmitting means for transmitting said exciting signal in the vicinity of said nonlinear object for causing a signal of a higher harmonic to be reflected by said nonlinear object;

    C. a means located in close proximity to said nonlinear object for receiving said higher harmonic reflected signal;

    D. filter means coupled to said receiving means for passing a predetermined harmonic portion of said received signal;

    E. means coupled to said generating means for multiplying said exciting signal to produce a signal of the same frequency as said signal reflected by said nonlinear object and filtered by said filter means;

    F. a first mixer for mixing said multiplied excited signal with said filtered reflected signal producing a combined signal;

    G. amplifier means for amplifying said combined signal, H. a discriminator coupled to the output of said amplifying means for producing a signal having an amplitude directly proportional to the distance to said nonlinear object, and I. a limiter interposed between said first mixer and said discriminator for reducing unwanted amplitude modulations.

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