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APPARATUS AND METHOD FOR DETECTING OBSTRUCTIONS IN PIPES OR CHANNELS

  • US 20140260626A1
  • Filed: 03/03/2014
  • Published: 09/18/2014
  • Est. Priority Date: 03/14/2013
  • Status: Abandoned Application
First Claim
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1. A method of monitoring for obstructions in a pipe or channel, the method comprising the steps of:

  • transmitting a wave into a first end of the pipe or channel from a transmitting transducer at a first known location relative to the pipe or channel, wherein frequency f of the transmitted wave varies in a predictable manner governed by function f=f(t), where t is time;

    noting the frequency ftr of the transmitted wave;

    detecting any reflections of the transmitted wave travelling towards the first end of the pipe or channel at a receiving transducer at a second known location relative to the pipe or channel;

    determining the frequency frec of the reflected wave;

    comparing the frequency ftr of the transmitted wave and the frequency frec of the reflected wave, being transmitted from and being received by the respective transducers at the same time t; and

    determining the distance L from the transmitting transducer to an obstruction and back to the receiving transducer from the difference Δ

    f between the frequency ftr and the frequency frec.

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