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High-speed Particle Image Velocimetry Near Surfaces

High-speed Particle Image Velocimetry Near Surfaces

Published on: June 24, 2013

Complex-optical-field lidar system for range and vector velocity measurement.

Shuang Gao¹, Maurice O'Sullivan, Rongqing Hui

¹Department of Electronic Engineering and Information Science, University of Science and Technology of China, Hefei, Anhui 230027, China.

|November 29, 2012

Summary

This study demonstrates a novel coherent lidar system for precise measurement of complex optical fields. It achieves independent vector velocity and distance measurements with high range resolution and unambiguous high-velocity detection.

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Last Updated: May 16, 2026

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Area of Science:

Optics and Photonics
Remote Sensing Technologies
Signal Processing

Background:

Coherent lidar systems typically measure scalar field properties.
Measuring complex optical fields offers potential for enhanced sensing capabilities.
Existing lidar technologies face limitations in range resolution and velocity ambiguity.

Purpose of the Study:

To demonstrate a coherent lidar system capable of measuring complex optical fields for the first time.
To enable independent measurement of vector velocity and target distance.
To achieve high range resolution and unambiguous high-velocity measurement.

Main Methods:

Utilized an electro-optic in-phase/quadrature (I/Q) modulator for carrier-suppressed complex optical field modulation.
Employed a fiber-optic 90° hybrid for coherent heterodyne detection and complex optical field recovery.
Implemented independent modulation waveforms on the positive and negative optical sidebands.

Main Results:

Successfully demonstrated the first coherent lidar system measuring complex optical fields.
Achieved independent measurement of vector velocity and target distance by modulating optical sidebands.
Obtained unprecedented range resolution and unambiguous high-velocity measurement capabilities.

Conclusions:

The developed coherent lidar system offers a significant advancement in optical field measurement.
This technology enables simultaneous and independent acquisition of crucial target information.
The system's performance characteristics open new possibilities for advanced remote sensing applications.