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Related Experiment Video

Updated: May 30, 2026

High-speed Particle Image Velocimetry Near Surfaces

High-speed Particle Image Velocimetry Near Surfaces

Published on: June 24, 2013

High-resolution random-modulation cw lidar.

Xiao Ai¹, Richard Nock, John G Rarity

¹Department of Electrical and Electronic Engineering, University of Bristol, Bristol, UK. xiao.ai@bristol.ac.uk

|August 12, 2011

Summary

This summary is machine-generated.

This study introduces a high-resolution lidar system for precise surface detection. The novel system achieves centimeter-level distance accuracy rapidly using a semiconductor laser diode and advanced signal processing techniques.

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Published on: October 17, 2010

Area of Science:

Optics and Photonics
Laser Technology
Sensing and Measurement

Background:

Traditional lidar systems face limitations in resolution and speed.
High-resolution surface detection is crucial for various applications.
Semiconductor laser diodes offer compact and efficient light sources.

Purpose of the Study:

To present a high-resolution random-modulation continuous wave lidar system.
To enhance distance accuracy and reduce acquisition time for surface detection.
To utilize a semiconductor laser diode with pseudorandom binary sequence modulation.

Main Methods:

Intensity modulation of a semiconductor laser diode with a pseudorandom binary sequence.
Implementation of interpolation and a novel front-end analog technique for enhanced resolution.
Development of a mathematical model including signal-to-noise ratio and distance standard deviation derivation.

Main Results:

Achieved distance accuracy of less than 2 cm.
Demonstrated capability within a 2.6 ms acquisition time.
Validated performance over distances ranging from 1 to 12 m.

Conclusions:

The developed lidar system offers high-resolution surface detection with excellent accuracy and speed.
The novel analog technique effectively lowers analog-to-digital converter requirements.
The system is suitable for applications demanding precise and rapid distance measurements.