Related Experiment Video
Updated: Apr 16, 2026
10:53
Simultaneous Measurement of Turbulence and Particle Kinematics Using Flow Imaging Techniques
Published on: March 12, 2019
7.7K
Simultaneous broadband laser ranging and photonic Doppler velocimetry for dynamic compression experiments
B M La Lone1, B R Marshall1, E K Miller1
1National Security Technologies, LLC, Special Technologies Laboratory, Santa Barbara, California 93111, USA.
The Review of Scientific Instruments
|March 2, 2015
Summary
A new fiber-optic diagnostic simultaneously measures distance and velocity of dynamic surfaces. This advanced tool accurately captures material position in complex experiments, overcoming limitations of traditional methods.
Area of Science:
- * Experimental Physics
- * Optical Diagnostics
- * Materials Science
Background:
- * Dynamic compression experiments require precise measurement of surface motion.
- * Traditional methods integrating velocity data can inaccurately determine material position, especially in non-planar scenarios.
- * Existing diagnostics often lack simultaneous distance and velocity measurement capabilities.
Purpose of the Study:
- * To develop a novel diagnostic for simultaneous, high-resolution measurement of distance and velocity for rapidly moving surfaces.
- * To overcome the limitations of velocity integration for accurate position determination in dynamic experiments.
- * To integrate distance measurement with Photonic Doppler Velocimetry (PDV) using a single fiber-optic probe.
Main Methods:
- * Development of a fiber-optic diagnostic based on Xia and Zhang's technique for distance measurement (20 ns resolution, speed-independent).
- * Extension of the diagnostic's range to several centimeters for dynamic experiments.
- * Multiplexing the ranging diagnostic with a Photonic Doppler Velocimetry (PDV) system for simultaneous data acquisition.
Main Results:
- * Demonstrated accurate surface position measurement on a spinning square cylinder, contrasting with inaccurate results from velocity integration.
- * Successfully identified copper fragments and surface ejecta in both distance and velocity signals during an explosive experiment.
- * Validated the complementary nature of direct distance measurements to velocity data in dynamic scenarios.
Conclusions:
- * The developed fiber-optic diagnostic provides accurate, simultaneous distance and velocity measurements for dynamic compression experiments.
- * This method enhances the understanding of material behavior by directly measuring position, crucial for non-planar events.
- * The diagnostic shows significant potential for applications in various fields requiring precise measurement of high-speed phenomena.
