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Multi-point differential laser doppler velocimeter using arrayed waveguide gratings with small wavelength

Koichi Maru¹, Kohjiro Kobayashi, Yusaku Fujii

¹Department of Electronic Engineering, Gunma University, 1-5-1 Tenjin-cho, Kiryu, Gunma 376-8515, Japan. maru@el.gunma-u.ac.jp

|February 23, 2010

Summary

A novel multi-point laser Doppler velocimeter (LDV) utilizes arrayed waveguide gratings (AWGs) to achieve high-accuracy, simultaneous velocity measurements in multiple depth points. This compact optical system significantly reduces wavelength sensitivity, enhancing measurement precision.

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Area of Science:

Optics and Photonics
Fluid Dynamics
Instrumentation Engineering

Background:

Conventional laser Doppler velocimetry (LDV) faces challenges in simultaneous multi-point measurements and wavelength sensitivity.
Arrayed waveguide gratings (AWGs) offer potential for compact optical systems with improved spectral resolution.

Purpose of the Study:

To propose and investigate a multi-point LDV system employing AWGs for enhanced velocity measurement capabilities.
To demonstrate the reduction in wavelength sensitivity achievable with AWG-based LDV systems.

Main Methods:

Utilizing the grating equation of AWGs to model and design the multi-point LDV system.
Simulating the optical characteristics and performance of the proposed LDV design.
Analyzing wavelength sensitivity across multiple measurement points.

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Main Results:

The proposed LDV system enables simultaneous velocity measurements at different points in the depth direction.
Wavelength sensitivity in the AWG-based LDV is reduced to less than 1/10 of that in conventional LDV.
The system design facilitates compact optical configurations for multi-point fluid velocity analysis.

Conclusions:

AWG technology provides a viable solution for developing compact, high-performance multi-point LDV systems.
The significant reduction in wavelength sensitivity enhances the accuracy and reliability of fluid velocity measurements.
This advancement opens possibilities for more sophisticated fluid dynamics research and industrial applications.