Developing dual-beam laser Doppler interferometry system for opto-piezoelectric materials based ultrasonic parking sensors and optofluidics sensors

2014 ◽  
Author(s):  
Po-Cheng Lai ◽  
Chih-Kung Lee
Keyword(s):  
Piezoelectric Materials ◽  
Laser Doppler ◽  
Beam Laser ◽  
Dual Beam

A Comparison of Four Velocity Bias Correction Techniques in Laser Doppler Velocimetry

1993 ◽  
Vol 115 (3) ◽  
pp. 508-514 ◽  
Author(s):  
R. D. Gould ◽  
K. W. Loseke
Keyword(s):  
Bias Correction ◽  
Ad Hoc ◽  
Sampling Technique ◽  
Laser Doppler ◽  
Laser Doppler Velocimeter ◽  
Beam Laser ◽  
Empirical Correction ◽  
Dual Beam ◽  
Data Rates ◽  
Velocity Bias

Data from a two-component dual-beam laser-Doppler Velocimeter were used to evaluate four different velocity bias correction methods. The data were collected over a range of valid data rates from 100 Hz to 20 kHz at four flow locations in a shear layer. Turbulence intensities ranged from 15 to 100 percent. Flow statistics were calculated using these proposed velocity bias correction techniques. The results were compared to the unbiased values, which were obtained using an approximated equal-time sampling technique. Some of the correction schemes performed well at low turbulence levels, but became ineffective at high turbulence levels. One ad hoc empirical correction scheme showed relatively good results throughout.

Dual-beam laser Doppler microscopy of suspension flows embedded into medium with strong scattering

2000 ◽  
Author(s):  
Alexander V. Priezzhev ◽  
Marina S. Polyakova ◽  
Ksenia B. Begun ◽  
Konstantin V. Vanag ◽  
Alexandra F. Pogrebnaya
Keyword(s):  
Laser Doppler ◽  
Suspension Flows ◽  
Beam Laser ◽  
Dual Beam ◽  
Strong Scattering
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