NGUYEN, Tat Thang and MURAKAWA, Hideki and TSUZUKI, Nobuyoshi and DUONG, Ngoc Hai and KIKURA, Hiroshige (2015) Ultrasonic Doppler velocity profile measurement of single- and two-phase flows using spike excitation. Sensors and Actuators, 16 (4). pp. 335-344.
Full text not available from this repository.Abstract
In the article, the application of the electrical spike, instead of the tone-burst, to the ultrasonic pulsed-Doppler velocity profiling the first time is presented. To generate ultrasound, the ultrasonic sensor is excited by the spike. For the Doppler method, the spike excitation was not used previously. It has been used with wideband signal processing methods. In our study, first, the fluid-velocity profile measurement using spike excitation has been carried out for single-phase pipe flow. The received data have been validated by the logarithmic law of the wall, for turbulent flow regime. The flow rate calculated by using the mean velocity profile well coincides with the flow-meter data. Furthermore, the spike signal and the Doppler method are used in the multiwave ultrasonic velocity profile (UVP) method, for the bubbly flow measurement. The experiments show that, if the spike signal is slowly damped, the generated ultrasonic wave is similar to the tone-burst that is required for the Doppler method, but in this case, usually the pulse length is smaller and depends on the damping and sensor characteristics. The autocorrelation technique is used for echo signal processing. The derived UVP systems inherit the advantages from both the spike excitation and Doppler method.
| Item Type: | Article |
|---|---|
| Subjects: | Engineering Mechanics |
| Divisions: | Faculty of Engineering Mechanics and Automation (FEMA) |
| Depositing User: | Ms. Cam Le Tran Thi |
| Date Deposited: | 18 Jul 2016 03:21 |
| Last Modified: | 18 Jul 2016 03:21 |
| URI: | http://eprints.uet.vnu.edu.vn/eprints/id/eprint/1794 |
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