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Speckle-based three-dimensional velocity measurement using spatial filtering velocimetry.

Theis F Q Iversen¹, Michael L Jakobsen, Steen G Hanson

¹OPDI Technologies A/S, Frederiksborgvej 399, 4000 Roskilde, Denmark. ti@opdi‐technologies.com

|April 12, 2011

Summary

This study introduces an optical technique to measure real-time 3D translational velocity for diffusely scattering objects. It combines speckle and fringe pattern motion for precise velocity tracking.

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Area of Science:

Optics and Photonics
Mechanical Engineering
Applied Physics

Background:

Accurate real-time measurement of 3D object velocity is crucial in various fields.
Existing methods may have limitations in speed, accuracy, or applicability to diffusely scattering surfaces.
Optical techniques offer non-contact measurement capabilities.

Purpose of the Study:

To develop and validate a novel optical method for measuring the real-time three-dimensional (3D) translational velocity of diffusely scattering rigid objects.
To demonstrate the feasibility of combining speckle and fringe pattern dynamics for comprehensive velocity measurement.
To provide a robust method for tracking object motion through an imaging system.

Main Methods:

Utilizing a coherent light source to illuminate the object, generating a random speckle pattern in the imaging system's observation plane.

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Employing an angular offset reference wave to create interference with the speckle pattern, forming a translating fringe pattern.

Analyzing the motion of both speckle and fringe patterns to extract translational velocity components.

Performing numerical simulations and experimental validation to assess measurement accuracy and dynamic response.

Main Results:

The proposed optical method successfully measures the real-time 3D translational velocity of diffusely scattering objects.
Speckle pattern translation correlates with in-plane object motion.
Fringe pattern translation, generated by interference, correlates with out-of-plane object motion.
Experimental results confirm the capability for full 3D velocity measurement.

Conclusions:

The presented optical method provides a viable solution for real-time, non-contact 3D velocity measurement of diffusely scattering objects.
The combined use of speckle and fringe pattern analysis offers a comprehensive approach to tracking object motion.
This technique has potential applications in robotics, manufacturing, and scientific instrumentation where precise motion tracking is required.