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Directional pedestal-free laser Doppler velocimetry without frequency biasing. Part 1.

Y C Agrawal, J R McCullough

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Area of Science:

Optical physics
Fluid dynamics
Instrumentation

Background:

Laser Doppler velocimetry (LDV) is a common technique for measuring fluid velocity.
Traditional LDV methods can be affected by the Doppler pedestal, complicating analysis.
Understanding the optical field's spatial structure is crucial for improving LDV performance.

Purpose of the Study:

To examine the spatial structure of the optical field in laser Doppler velocimetry.
To propose and theoretically describe a novel LDV method for determining particle motion direction.
To eliminate the Doppler pedestal in velocity measurements.

Main Methods:

Analysis of the optical field's spatial structure on a detector.
Theoretical description of a method utilizing temporal correlation of photocurrents.
Implementation using two spatially offset detector arrays.

Main Results:

For small scatterers, the optical field forms a traveling wave determined by detector optics.
The direction of the optical field's travel directly corresponds to the scattering particle's motion.
The proposed method determines particle motion direction through photocurrent temporal correlation.

Conclusions:

The spatial structure of the optical field provides directional information about particle movement.
Spatially offset detector arrays enable accurate determination of particle motion direction.
This novel LDV approach theoretically eliminates the Doppler pedestal, enhancing measurement accuracy.