Simultaneous Cross-Sectional Velocity Distribution Measurements Using Laser Doppler Velocimeter Employing 7 × 8 Spatial Encoding

A laser Doppler velocimeter employing 7×8-channel spatially encoded measurement points is proposed for simultaneous cross-sectional velocity distribution measurements. The measurement points arranged in two dimensions are encoded by combining wavelength-division multiplexing and multiple bias-frequency encoding. The functionality of the proposed method was experimentally demonstrated.