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Micro-particle Image Velocimetry for Velocity Profile Measurements of Micro Blood Flows

Published on: April 25, 2013

Laser Doppler velocimeter that selectively measures a specified velocity vector.

O Sasaki, T Abe, T Shimizu

|March 11, 2010

Summary

A novel laser Doppler velocimeter (LDV) measures specific velocity vectors by analyzing Doppler signal waveform changes. This system accurately determines raindrop falling velocity, demonstrating its practical utility in meteorological measurements.

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Area of Science:

Fluid Dynamics
Meteorology
Optical Measurement Techniques

Background:

Traditional laser Doppler velocimeters (LDVs) can struggle with directional ambiguity in velocity measurements.
Accurate measurement of raindrop falling velocity is crucial for meteorological studies and weather forecasting.

Purpose of the Study:

To propose and validate a new laser Doppler velocimeter (LDV) capable of selectively measuring velocity vectors.
To apply this novel LDV system for the precise measurement of raindrop falling velocities.

Main Methods:

Development of an LDV system where Doppler signal waveform directionality indicates velocity vector direction.
Implementation of a vector selection mechanism based on detecting period differences within Doppler bursts.
Experimental validation of the system's performance in measuring raindrop fall speeds.

Main Results:

The proposed LDV system successfully distinguishes and measures specific velocity vectors.
Experimental data confirmed the system's capability to accurately determine raindrop falling velocities.
The waveform-based directional detection proved effective for selective velocity vector measurement.

Conclusions:

The novel LDV design offers enhanced directional velocity measurement capabilities.
This system provides a reliable method for measuring raindrop falling velocity.
The developed LDV system demonstrates significant potential for meteorological applications.