Fluid flow measurement capabilities of a traveling wave laser oscillator (or ring laser) are assessed theoretically and experimentally. The feasibility of this alternative optical technique for measuring gas flow profiles without insertion of a mechanical probe is examined. Measurements are reported for a range of Reynolds numbers including both laminar and turbulent flows and for a variety of tube diameters. The experimental results are compared with the theory of conditions preceding the establishment of the equilibrium laminar flow profile in round tubes.
© 1968 Optical Society of America
Original Manuscript: June 6, 1968
Published: December 1, 1968
Paul Fenster and Walter K. Kahn, "An Optical Technique for Measurement of Gas Flow Profiles Utilizing a Ring Laser," Appl. Opt. 7, 2383-2391 (1968)