کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
754580 1462421 2015 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
On the use of power reflection ratio and phase change to determine the geometry of a blockage in a pipe
ترجمه فارسی عنوان
در استفاده از نسبت انعکاس قدرت و تغییر فاز برای تعیین هندسه یک انسداد در لوله
کلمات کلیدی
موج هدایت، تشخیص انسداد، تغییر فاز، روش معکوس
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی مکانیک
چکیده انگلیسی


• An inverse technique is proposed to reconstruct the geometry of a blockage in a pipe.
• Standard pulse reflectometry is used, and a short pulse is projected into the pipe.
• Transient incident and reflected signals are transformed into the frequency domain.
• Phase change and power reflection ratio are used for the reconstruction process.
• The inverse technique is robust and easy to implement.

Blockages may be detected in pipes by sending acoustic signals down the pipe and measuring the echo from the blockage. This presents a fast and efficient way of determining the presence of a blockage and this method is now being used, for example, to probe the integrity of sewer systems. In this article a method is presented for obtaining both the length and the equivalent cross-sectional area of a blockage using only a single microphone to capture the incident and reflected pulse. The method presented uses the change in phase between the incident and reflected acoustic signals caused by a blockage, as well as the difference in the amplitude of each pulse, to generate two independent equations from which the area ratio and the length of the blockage may be recovered. This requires measurements to be carried out in the plane wave region of the pipe, however it is shown that through appropriate processing of each signal in the frequency domain the area ratio and length of a relatively large number of blockages can be successfully recovered.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Acoustics - Volume 87, January 2015, Pages 190–197
نویسندگان
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