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Related Experiment Video

Updated: Jun 12, 2026

The Frequency Domain Thermoreflectance Technique for Thermal Property Measurements

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Published on: December 5, 2025

Compensation for refractive-index variations in laser Doppler anemometry.

A B Kehoe, P V Desai

|May 22, 2010

Summary

This study presents a new method for laser Doppler anemometry to accurately measure fluid velocity in layered media. The technique achieves high positioning accuracy, crucial for applications like nuclear fuel assemblies.

Area of Science:

Fluid dynamics
Optical measurement techniques
Nuclear engineering

Background:

Laser Doppler anemometry (LDA) is sensitive to variations in the refractive index of the medium.
Accurate velocity measurements are critical in complex environments like nuclear fuel assemblies.

Purpose of the Study:

To develop and validate techniques for compensating refractive index variations in LDA.
To improve the accuracy of LDA measurements in discontinuous and continuous layered media.

Main Methods:

Employed a discrete element method for discontinuous plane-layered media.
Derived and simplified alternative equations for continuous cylindrically layered media.
Conducted velocity measurements using a Plexiglas model of a nuclear fuel assembly.

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Main Results:

Successfully compensated for refractive index variations in LDA.
Achieved a positioning accuracy of 0.025 cm in velocity measurements.
Validated the method for continuous cylindrically layered media.

Conclusions:

The developed method effectively compensates for refractive index variations in LDA.
The technique offers high positioning accuracy for velocity measurements in complex layered media.
This advancement is particularly relevant for applications in nuclear fuel assembly analysis.