Materials, Photonic Devices, and Sensors

Nonmechanical cross-sectional scanning laser Doppler velocimeter with directional discrimination of transverse velocity component

[+] Author Affiliations
Koichi Maru

Kagawa University, Graduate School of Engineering, 2217-20 Hayashi-cho, Takamatsu, Kagawa 761-0396, Japan

Takahiro Hata

Kagawa University, Graduate School of Engineering, 2217-20 Hayashi-cho, Takamatsu, Kagawa 761-0396, Japan

Opt. Eng. 54(1), 017102 (Jan 02, 2015). doi:10.1117/1.OE.54.1.017102
History: Received June 10, 2014; Accepted December 3, 2014
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Abstract.  We propose a nonmechanical cross-sectional scanning laser Doppler velocimeter (LDV) with directional discrimination of the transverse velocity component. In the proposed LDV, a combination of changes in wavelength and the port of the fiber array between the main body and probe are used to scan the measurement position on a two-dimensional (2-D) cross-sectional plane that is perpendicular to the direction of flow. Optical frequency shifting using acousto-optic modulators (AOMs) is employed to discriminate the direction of the transverse velocity component. Polarization multiplexing is used to transmit frequency-shifted beams from the main body to the probe. The experimental results reveal that the 2-D scanning function and introduction of directional sensitivity are successfully achieved.

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© 2015 Society of Photo-Optical Instrumentation Engineers

Citation

Koichi Maru and Takahiro Hata
"Nonmechanical cross-sectional scanning laser Doppler velocimeter with directional discrimination of transverse velocity component", Opt. Eng. 54(1), 017102 (Jan 02, 2015). ; http://dx.doi.org/10.1117/1.OE.54.1.017102


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