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Frequency-analysis-type water level measuring method and device therefor

  • US 6,053,042 A
  • Filed: 09/19/1997
  • Issued: 04/25/2000
  • Est. Priority Date: 11/20/1996
  • Status: Expired due to Term
First Claim
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1. A method of measuring a water level of a frequency analysis type in a device where a pipe type of which immersed length is in a proportion to the water level and which is installed in a container having a fluid, a signal detecting device which has an impact apparatus to provide a source signal periodically or continuously and a impact detecting sensor(s) which gets a response signal of the pipe by the impact apparatus, and a signal analyzer which processes the signal from the impact detecting sensor, said method comprising the steps of:

  • generating a source signal to the pipe by the impact apparatus;

    detecting the response signal of the pipe according the water level by the impact detecting sensor;

    analyzing the response signal to the frequency response spectra by the signal analyzer; and

    measuring the water level by comparing to the predetermined frequencies which was obtained by the signal analyzer.

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