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DEVICE AND METHOD FOR DETECTION OF WATER FLOW IN GROUND

  • US 20120262326A1
  • Filed: 10/12/2010
  • Published: 10/18/2012
  • Est. Priority Date: 10/15/2009
  • Status: Active Grant
First Claim
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1. Device for the detection of water leaks in ground, the device comprises a radar emitting unit, a detection unit for detection of reflected radar signals, a signal processing unit for, in the time domain, analysing the reflected radar signals to determine whether the frequencies of the reflected signals are Doppler shifted,the device is characterised in that the signal processing unit (3) comprises a band-pass filter for band-pass filtering the frequencies in the reflected radar signals, a detector to determine the derivative of the amplitude of the reflected signal and determine a measure of the absolute change of the derivative, and a decision processor for comparing said measure of the absolute change of the derivative with a predetermined threshold value corresponding to the signal value of the background.

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