Title :
Doppler difference velocimetry using a 2-core photonic crystal fibre
Author :
MacPherson, W.N. ; Jones, J.D.C. ; Mangan, B.J. ; Knight, J.C. ; Russell, P.St.J.
Author_Institution :
Dept. of Phys., Heriot-Watt Univ., Edinburgh, UK
Abstract :
In this paper we describe the first use of a two core photonic crystal fibre for fringe projection for use in a Doppler difference velocimeter. The two-core fibre, with a core separation of 17 /spl mu/m, projects a series of fringes when both cores are illuminated with 633 nm light simultaneously. Light scattered from moving particles is coupled into a separate multi-mode (50/125 /spl mu/m) receiving fibre and detected using a silicon detector and amplifier. The measured reflection intensity signal is processed in the frequency domain to obtain the velocity component of the moving particle.
Keywords :
Doppler measurement; fibre optic sensors; laser velocimetry; light scattering; photonic band gap; 125 micron; 17 micron; 2-core photonic crystal fibre; 50 micron; 633 nm; Doppler difference velocimeter; Doppler difference velocimetry; core separation; frequency domain; fringe projection; laser velocimetry; light scattering; moving particles; reflection intensity signal; separate multi-mode receiving fibre; silicon detector; velocity component; Frequency measurement; Light scattering; Optical coupling; Optical reflection; Particle measurements; Particle scattering; Photonic crystal fibers; Signal processing; Silicon; Velocity measurement;
Conference_Titel :
Optical Fiber Sensors Conference Technical Digest, 2002. Ofs 2002, 15th
Conference_Location :
Portland, OR, USA
Print_ISBN :
0-7803-7289-1
DOI :
10.1109/OFS.2002.1012108
