Title :
Mathematical Modeling of Heterodyne-Type Laser Doppler Velocimeter Operating Via Long Optical Fiber Guide
Author :
Khotiaintsev, S. ; Vazquez-Zuniga, L.A. ; Alvarado-Cruz, M.A.
Author_Institution :
Fac. of Eng., Nat. Autonomous Univ. of Mexico, Mexico City
fDate :
June 29 2006-July 1 2006
Abstract :
We present a mathematical model of the signal and noise components in the heterodyne-type laser Doppler velocimeter (LDV) which operates via long optical fiber guide. Our model accounts for laser power output, the length of the optical fiber guide, its absorption, the Rayleigh and Brillouin scattering in the optical fiber guide, and the photo detector parameters. The scattering properties of the moving particles in the liquid or gas flow which is accessed by the LDV are accounted for by an integral scattering coefficient. We show that the Rayleigh and Brillouin scattering in the optical fiber are the principal noise sources that corrupt the signal-to-noise ratio of the present LDV. The numerical examples show that Ae SNR can be as low as 0 dB in the case of the typical optical fibers of a length of several kilometers
Keywords :
Brillouin spectra; Doppler measurement; Rayleigh scattering; fibre optic sensors; heterodyne detection; laser velocimeters; optical fibres; photodetectors; Brillouin scattering; Rayleigh scattering; gas flow; heterodyne-type velocimeter; integral scattering coefficient; laser Doppler velocimeter; laser power output; liquid flow; long optical fiber guide; moving particles; optical absorption; optical fiber guide; optical fibers; photodetector; principal noise sources; signal-to-noise ratio; Brillouin scattering; Fiber lasers; Laser modes; Laser noise; Mathematical model; Optical fibers; Optical noise; Optical scattering; Rayleigh scattering; Signal to noise ratio; laser Doppler velocimetry; optical fiber sensors; optical fibers; optical scattering;
Conference_Titel :
Laser and Fiber-Optical Networks Modeling, 8-th International Conference on
Conference_Location :
Kharkiv
Print_ISBN :
1-4244-0233-6
Electronic_ISBN :
1-4244-0234-4
DOI :
10.1109/LFNM.2006.251968
