Directional discrimination for fiber-optic non-mechanical scanning laser Doppler velocimeter using single transmission path

Maru, Koichi; Hata, Takahiro

doi:10.1016/j.ijleo.2014.08.010

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2015

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“…4,5 An LDV with a compact sensor probe is desirable for practical applications. [9][10][11] In these LDVs, acousto-optic modulators (AOMs) or electro-optic phase shifters were employed for optical frequency shifting. However, these techniques have disadvantages because the moving mechanism can be easily damaged by mechanical impact on the probe and is subject to abrasion.…”

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confidence: 99%

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

Maru

Hata

2015

Opt. Eng

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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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