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Related Experiment Video

Updated: Jun 15, 2026

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

Published on: April 25, 2013

Laser Doppler velocimeter with a differential photodiode array.

|March 10, 2010

Summary

This summary is machine-generated.

A differential detector can cancel low-frequency noise in laser Doppler velocimetry (LDV). This results in a pure signal proportional to object velocity, as confirmed by experiments.

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Last Updated: Jun 15, 2026

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Published on: March 8, 2018

Area of Science:

Optics
Metrology
Signal Processing

Background:

Laser Doppler velocimetry (LDV) is a common technique for measuring velocity.
Standard LDV systems can be affected by low-frequency disturbances in their output signals.

Purpose of the Study:

To analyze the Fourier optical model of LDV.
To investigate methods for improving LDV signal quality by reducing low-frequency disturbances.

Main Methods:

Analysis of the LDV based on a Fourier optical model.
Derivation of the relationship between power spectral density and optical element structure.
Implementation and testing of a differential detector.

Main Results:

A direct relation between output signal power spectral density and optical element structure was derived.
A differential detector effectively cancels low-frequency disturbances in the LDV output.
The output signal transforms into a pure narrowband signal.

Conclusions:

The differential detector method significantly enhances LDV performance.
The modified LDV system provides a signal directly proportional to object velocity.
Experimental results validate the effectiveness of the differential detector for accurate velocity measurements.