Abstract

To measure flow velocity, a new technique, laser diode array velocimetry, generates multiple laser spots (four or more) separated by short distances (20–100 µm) at the probe volume. Particles that pass through the probe volume generate a signal that is analyzed by a digital signal processor for frequency content. The product of frequency and laser-to-laser spot separation determines the velocity. Rotating wire and wind-tunnel experiments confirm the performance of the new technique. An error analysis showed that the uncertainties in the processed diode array velocimetry signal frequency were less than 0.3%, and uncertainties in the beam-to-beam separation were less than ±0.05%.

© 1997 Optical Society of America

Uncertainty in velocity measurement based on diode-laser absorption in nonuniform flows

Fei Li, Xilong Yu, Weiwei Cai, and Lin Ma
Appl. Opt. 51(20) 4788-4797 (2012)

Proposal and testing for a fiber-optic-based measurement of flow vorticity

Shenghong Yao, Penger Tong, and Bruce J. Ackerson
Appl. Opt. 40(24) 4022-4027 (2001)

Simultaneous measurement of the velocity and the displacement of the moving rough surface by a laser Doppler velocimeter

K. Matsubara, W. Stork, A. Wagner, J. Drescher, and K. D. Müller-Glaser
Appl. Opt. 36(19) 4516-4520 (1997)

Three-component flow velocity measurements with stereoscopic picosecond laser electronic excitation tagging

Colter Russell, Naibo Jiang, Paul Danehy, Zhili Zhang, and Sukesh Roy
Appl. Opt. 60(15) C121-C130 (2021)

Fiber-optic dual-cylindrical wave sensor for measurement of wall velocity gradient in a fluid flow

Amir A. Naqwi and Stanislav Petrik
Appl. Opt. 32(30) 6128-6131 (1993)