Effect of the optical numerical aperture on the Doppler spectrum in laser Doppler velocimetry

We have investigated the effect of the optical system design on the characteristics of the Doppler spectrum of a laser Doppler velocimeter, by means of a Monte Carlo simulation model. We show that numerical aperture is one of the parameters that strongly affect the full width at half maximum and sig...

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Bibliographic Details
Main Authors: Mowla, Alireza, Nikolic, Milan, Yah Leng Lim, Bertling, Karl, Rakic, Aleksandar D., Taimre, Thomas
Format: Conference Proceeding
Language:English
Subjects:
Backscatter
Doppler effect
Laser beams
Laser modes
Lenses
Measurement by laser beam
Photonics
Online Access:Request full text
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Summary:We have investigated the effect of the optical system design on the characteristics of the Doppler spectrum of a laser Doppler velocimeter, by means of a Monte Carlo simulation model. We show that numerical aperture is one of the parameters that strongly affect the full width at half maximum and signal to noise ratio of the Doppler spectrum. The profile and intensity of the enhanced backscattering of the laser beam from a diffusive rough aluminum disk surface is measured using a range of lenses with different focal lengths and the results are incorporated into the Monte Carlo model.
ISSN:1097-2137
2377-5505
DOI:10.1109/COMMAD.2014.7038654