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HIST0RICAL DEVEL0PMENT 0F THE LASER ANEMOMETER
RELATED PHYSICAL PHEN0MENA
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alignment amplifier amplitude angle Appendix M3 avalanche photodiodes averaging band-width beam splitter calculate cavity coherence collecting aperture component constant defined density detection detector diameter direction Doppler effect Doppler frequency Doppler shift Doppler signal Doppler uncertainty electronic equation expression Fabry-Perot finite flow fluctuations fluid focused Fourier transform frequency shift fringe model Gaussian given Hence hot wire incident instantaneous intensity laser beam Laser Doppler Velocimeter laser light laser velocimeter lens light scattered line-width measure the velocity mirrors mode number of particles obtained optical output particle statistics phase photo-current photodetector photomultiplier Phys pipe plane population inversion power spectrum proportional radius reference beam refractive index Reynolds stress Rudd sampling volume scattered light scattering centres scattering volume Section shot noise shown in Figure signal beam signal power single-beam laser anemometer spectrum analyser tracking filter turbulent velocities Velocimeter velocity velocity vector voltage wave wavelength width zero-crossings