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Radio frequency spectroscopy apparatus and method using multiple frequency waveforms

  • US 4,765,179 A
  • Filed: 03/06/1987
  • Issued: 08/23/1988
  • Est. Priority Date: 09/09/1985
  • Status: Expired due to Term
First Claim
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1. In an apparatus enabling a determination of the concentration of a chemical in a test sample including electromagnetic waveform generation means for generating a electromagnetic signal, probe means coupled to said generation means for transmission of said signal as an input signal into said test sample and formed for receipt of said signal after propagation through at least a portion of said test sample as an output signal, and detection means coupled for receipt of said input signal and said output signal and responsive thereto to quantify a change between said input signal and said output signal, the improvement in said apparatus comprising:

  • said generation means generating a periodic electromagnetic signal having plurality of simultaneously present frequencies to produce a periodic waveform of known shape; and

    said detection means being responsive to said input signal and said output signal to quantify a change in shape between said input signal and said output signal.

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