eprintid: 1794
rev_number: 7
eprint_status: archive
userid: 5
dir: disk0/00/00/17/94
datestamp: 2016-07-18 03:21:28
lastmod: 2016-07-18 03:21:58
status_changed: 2016-07-18 03:21:28
type: article
metadata_visibility: show
creators_name: NGUYEN, Tat Thang
creators_name: MURAKAWA, Hideki
creators_name: TSUZUKI, Nobuyoshi
creators_name: DUONG, Ngoc Hai
creators_name: KIKURA, Hiroshige
title: Ultrasonic Doppler velocity profile measurement of single- and two-phase flows using spike excitation
ispublished: pub
subjects: Mechanics
divisions: fac_fema
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.
date: 2015
date_type: published
official_url: DOI: 10.1016/0250-6874(89)85004-8
full_text_status: none
publication: Sensors and Actuators
volume: 16
number: 4
pagerange: 335-344
refereed: TRUE
citation:   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.