On-Line Pipe Length Measurement And Development of Anomaly Monitoring System Using Acoustic Sensor

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In the field of measurement and control, there are many applications where the measurement of pipe length and pattern plays an important role. From this view point, an automatic on-line measurement system was proposed, which measured the length of a pipe using an acoustic sensor. This system modeled the fluctuation of the acoustic pressure in the pipe by a linear dynamic system and used a bank of Kalman filters to estimate the length on-line. Next proposed was an automaic measurement system which made use of the dynamic characteristics of transmitting and receiving transducers and the sonic wave propagation mechanism in the pipe system and measured accurately the length and pattern of the pipe system. To get information on the pattern and length, the system utilized a pattern matching of the received reflected wave and the predicted one derived through the sensor's characteristics and the sonic wave propagation model.Finally, the proposed method was reported to be effective to monitor the anomaly in the pipe system.