G - Physics – 01 – W
Patent
G - Physics
01
W
349/35, 349/38
G01W 1/14 (2006.01) G01B 17/02 (2006.01)
Patent
CA 1253246
Abstract of the Disclosure Apparatus for determining or measuring the depth of precipitation accumulating on the surface of a pathway, such as an airport runway or the like. The apparatus includes a sensor having electrical transducer means for emitting and sensing ultrasonic energy and having a body of material adapt- ed to be embedded in the pathway with the top surface of the body being substantially flush therewith and exposed to the precipitation, the transducer means being physically coupled to the body. A circuit causes the transducer means to emit pulses of ultrasonic energy which are reflected as a plurality of reflections from the top surface of the body and from the upper surface of an accumulation of precipitation on the top surface of the body and are respectively returned to the trans- ducer means which in response to the reflected pulses produces corresponding electrical signals. Another circuit generates a third electrical signal representing the depth of the precipi- tation as a function of the time interval between occurrences of at least two of the electrical signals. Methods of deter- mining or measuring precipitation depth are also disclosed.
497194
Smart & Biggar
Surface Systems Inc.
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