The details of a technique to measure solid surface velocity and detect particle movement are presented. This technique is based on the measurements of the frequency change of scattered light of particles crossing the fringes of a nearly Bessel beam formed by an axicon. Experimental results are presented and confirm the theoretical analysis and numerical simulations. Measurements of the movement of wires through the fringes were also performed.
We analyze theoretically, numerically, and experimentally the spectral response of scattered light intensity from moving particles crossing the fringes of a Bessel beam. This response could be the basis of a simple technique to measure velocity.
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