{
  "$type": "site.standard.document",
  "description": "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…",
  "path": "/patents/970011",
  "publishedAt": "2014-09-17T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "B64D37/32",
    "WESTON AEROSPACE LTD [GB]"
  ],
  "textContent": "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 f tr 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 f rec of the reflected wave (14); (5) comparing the frequency f tr of the transmitted wave and the frequency f rec 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 f between the frequency f tr and the frequency f rec .",
  "title": "Apparatus and method for detecting obstructions in pipes or channels"
}