Determination of complex propagation constant, acoustic intensity, and acoustic power in an arbitrarily terminated pipe using laser Doppler anemometry

2006 ◽  
Vol 120 (5) ◽  
pp. 3339-3339
Author(s):  
Ki Won Jung ◽  
Anthony A. Atchley
Keyword(s):  
Laser Doppler Anemometry ◽  
Propagation Constant ◽  
Acoustic Power ◽  
Laser Doppler ◽  
Acoustic Intensity ◽  
Complex Propagation

Acoustic power flow measurement in a thermoacoustic resonator by means of laser Doppler anemometry (L.D.A.) and microphonic measurement

2000 ◽  
Vol 60 (1) ◽  
pp. 1-11 ◽  
Author(s):  
H. Bailliet ◽  
P. Lotton ◽  
M. Bruneau ◽  
V. Gusev ◽  
J.C. Valière ◽  
...  
Keyword(s):  
Flow Measurement ◽  
Power Flow ◽  
Laser Doppler Anemometry ◽  
Acoustic Power ◽  
Laser Doppler

scholarly journals Determination of air and hydrofoil pressure coefficient by laser doppler anemometry

2010 ◽  
Vol 37 (1) ◽  
pp. 17-35
Author(s):  
Slavica Ristic ◽  
Mirjana Puharic ◽  
Marina Kutin ◽  
Dusan Matic
Keyword(s):  
High Speed ◽  
Stokes Equations ◽  
Laser Doppler Anemometry ◽  
Pressure Coefficient ◽  
Laser Doppler ◽  
Navier Stokes ◽  
Navier Stokes Equations ◽  
Advantages And Disadvantages ◽  
Axial Pump

Some results of experiments performed in water cavitation tunnel are presented. Pressure coefficient (Cp) was experimentally determined by Laser Doppler Anemometry (LDA) measurements. Two models were tested: model of airplane G4 (Super Galeb) and hydrofoil of high speed axial pump. These models are not prepared for conventional pressure measurements, so that LDA is applied for Cp determination. Numerical results were obtained using a code for average Navier-Stokes equations solutions. Comparisons between computational and experimental results prove the effectiveness of the LDA. The advantages and disadvantages of LDA application are discussed. Flow visualization was made by air bubbles.

scholarly journals Sound Power Estimation by Laser Doppler Vibration Measurement Techniques

1998 ◽  
Vol 5 (5-6) ◽  
pp. 297-305 ◽  
Author(s):  
G.M. Revel ◽  
G. L. Rossi
Keyword(s):  
Measurement Techniques ◽  
Acoustic Power ◽  
Industrial Applications ◽  
Laser Doppler ◽  
Vibration Measurement ◽  
Sound Power ◽  
Vibration Data ◽  
Uncertainty Sources ◽  
Intensity Measurements

The aim of this paper is to propose simple and quick methods for the determination of the sound power emitted by a vibrating surface, by using non-contact vibration measurement techniques. In order to calculate the acoustic power by vibration data processing, two different approaches are presented. The first is based on the method proposed in the Standard ISO/TR 7849, while the second is based on the superposition theorem. A laser-Doppler scanning vibrometer has been employed for vibration measurements. Laser techniques open up new possibilities in this field because of their high spatial resolution and their non-intrusivity. The technique has been applied here to estimate the acoustic power emitted by a loudspeaker diaphragm. Results have been compared with those from a commercial Boundary Element Method (BEM) software and experimentally validated by acoustic intensity measurements. Predicted and experimental results seem to be in agreement (differences lower than 1 dB) thus showing that the proposed techniques can be employed as rapid solutions for many practical and industrial applications. Uncertainty sources are addressed and their effect is discussed.

Determination of the measuring position in laser-Doppler anemometry

2004 ◽  
Vol 6 (2) ◽  
pp. 105-110 ◽  
Author(s):  
F. Durst ◽  
R. Müller ◽  
J. Jovanovic
Keyword(s):  
Laser Doppler Anemometry ◽  
Laser Doppler
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