APPARATUS AND METHOD FOR DETECTING OBSTRUCTIONS IN PIPES OR CHANNELS
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United States of America Patent
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Issued Date -
Sep 18, 2014
app pub date -
Mar 3, 2014
filing date -
Mar 14, 2013
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Abstract
Apparatus and method of monitoring for obstructions in a pipe or channel. The method comprising the steps of: (1) 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 the frequency f of the transmitted wave (13) varies in a predictable manner governed by the function f=f(t), where t is time; (2) noting the frequency ftr of the transmitted wave; (3) 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; (4) determining the frequency frec of the reflected wave (14); (5) 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 6) determining the distance L from the transmitting transducer to an obstruction and back to the receiving transducer from the difference Δf between the frequency ftr and the frequency frec.
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