Laser Doppler Anemometry - a non-intrusive optical measuring technique for fluid velocity

1987 ◽  
Vol 4 (1-4) ◽  
pp. 26-37 ◽  
Author(s):  
Bodo Ruck
Keyword(s):  
Laser Doppler Anemometry ◽  
Fluid Velocity ◽  
Laser Doppler ◽  
Measuring Technique ◽  
Optical Measuring ◽  
Optical Measuring Technique

Measurement of R-curve in clay brick blocks using optical measuring technique

2014 ◽  
Vol 121-122 ◽  
pp. 1-10 ◽  
Author(s):  
Lorenzo Graziani ◽  
Marcin Kneć ◽  
Tomasz Sadowski ◽  
Marco D’Orazio ◽  
Stefano Lenci
Keyword(s):  
Measuring Technique ◽  
Clay Brick ◽  
Optical Measuring ◽  
Optical Measuring Technique

Uncomplicated Setting Apparatus for Measurement of Fluid Flow Rate Using Laser Doppler Technique: Physics Teaching

2013 ◽  
Vol 770 ◽  
pp. 366-369
Author(s):  
Chatchalong Apiputikul ◽  
Kheamrutai Thamaphat ◽  
Monrudee Ranusawad ◽  
Pichet Limsuwan
Keyword(s):  
Water Flow ◽  
Flow Rate ◽  
Doppler Shift ◽  
Laser Doppler Anemometry ◽  
Scattered Light ◽  
Fluid Velocity ◽  
Water Flow Rate ◽  
Processing System ◽  
Laser Doppler ◽  
Single Observation

Laser Doppler velocimetry (LDV) or laser Doppler anemometry (LDA) is the technique of using the Doppler shift in a laser beam to determine the fluid velocity. In this work, dual beam mode (two incident beams, single observation location) was selected to use. A cost effective and easy module for measurement of water flow rate was designed and constructed. A He-Ne laser with a wavelength of 632.8 nm was used as a light source. The laser was passed through a beam splitter and divided into two beams with identical intensity and coherence. Subsequently, the two laser beams travelled to a focusing lens with a focal length of 100 mm and focused on a center of water flow channel in quartz cuvette with a dimension of 1 × 1 × 5 cm3. The beam angle was set at 4.96°. When the seeding particles, bubbles and microorganism in water, were moving through the intersection point of two beams, the light was scattered. The scattered light was collected by photodetector connected to processing system. The frequency of scatterred light is shifted according to the Doppler shift relations due to effect of Rayleigh scattering. The water flow rate can be calculated from Doppler shift frequency.

A new, optical measuring technique for the determination of the vapour film thickness during film boiling

1995 ◽  
Vol 66 (6) ◽  
pp. 244-250 ◽  
Author(s):  
Reiner Weichert ◽  
Rudolf Jeschar ◽  
Walter Klemm ◽  
Viktor Heidt ◽  
Patrick Thibor ◽  
...  
Keyword(s):  
Film Thickness ◽  
Measuring Technique ◽  
Film Boiling ◽  
Optical Measuring ◽  
Optical Measuring Technique ◽  
Vapour Film

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
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