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

Author

Mowla, Alireza ; Nikolic, Milan ; Yah Leng Lim ; Bertling, Karl ; Rakic, Aleksandar D. ; Taimre, Thomas

Author_Institution

Sch. of Inf., Technol. & Electr. Eng., Univ. of Queensland, Brisbane, QLD, Australia

fYear

2014

fDate

14-17 Dec. 2014

Firstpage

72

Lastpage

74

Abstract

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.

Keywords

Doppler measurement; Doppler shift; Monte Carlo methods; laser velocimeters; numerical analysis; Doppler spectrum; Monte Carlo simulation; diffusive rough aluminum disk surface; focal lengths; laser Doppler velocimetry; laser beam; optical numerical aperture; optical system; signal-to-noise ratio; Backscatter; Doppler effect; Laser beams; Laser modes; Lenses; Measurement by laser beam; Photonics;

fLanguage

English

Publisher

ieee

Conference_Titel

Optoelectronic and Microelectronic Materials & Devices (COMMAD), 2014 Conference on

Conference_Location

Perth, WA

Print_ISBN

978-1-4799-6867-1

Type

conf

DOI

10.1109/COMMAD.2014.7038654

Filename

7038654