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High-precision measuring method and apparatus

  • US 20040207409A1
  • Filed: 05/13/2004
  • Published: 10/21/2004
  • Est. Priority Date: 04/28/1999
  • Status: Active Grant
First Claim
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1. A method of monitoring a condition having a known relation to, or influence on, the transit time of transmission of a cyclically-repeating energy wave moving through a transmission channel, comprising the following operations:

  • (a) transmitting a cyclically-repeating energy wave through said transmission channel;

    (b) continuously changing the frequency of the transmission according to changes in the monitored condition while maintaining the number of waves in a loop including the transmission channel as a whole integer; and

    (c) utilizing the changes in frequency of the transmission to provide a continuous indication of the monitored condition.

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