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A Multimodal Wide-Field Fourier-Transform Raman Microscope

A Multimodal Wide-Field Fourier-Transform Raman Microscope

Published on: December 30, 2025

Broadband performance of a moving time reversing array.

Karim G Sabra¹, David R Dowling

¹Department of Mechanical Engineering, University of Michigan, Ann Arbor, Michigan 48109-2121, USA.

The Journal of the Acoustical Society of America

|September 30, 2003

Summary

This summary is machine-generated.

Array motion impacts acoustic time reversal focusing. Tilted arrays offer a versatile compromise for towed systems in underwater acoustics, balancing performance and practicality for sonar and communication.

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Time Multiplexing Super Resolving Technique for Imaging from a Moving Platform

Time Multiplexing Super Resolving Technique for Imaging from a Moving Platform

Published on: February 12, 2014

Area of Science:

Underwater acoustics
Acoustic signal processing
Array signal processing

Background:

Acoustic time reversal (TRA) uses reciprocity to focus sound waves.
TRAs are valuable for active sonar and underwater communication in complex environments.
Stationary vertical arrays are common, but practical use requires mobile arrays.

Purpose of the Study:

Investigate the influence of array motion and orientation on TRA retrofocusing in shallow oceans.
Analyze the impact of towing speed and array configuration on focusing performance.
Evaluate the feasibility of different array types for underwater acoustic applications.

Main Methods:

Theoretical and computational modeling of TRA retrofocusing.
Simulation of a straight, linear TRA (vertical, horizontal, tilted) with constant tow speed.
Analysis of a stationary point source emitting a broadband pulse.

Main Results:

Array motion causes retrofocus shift towards the direction of motion due to translation.
Towed horizontal TRAs show faster performance degradation with speed than vertical arrays due to Doppler effects.
Tilted arrays demonstrate performance close to vertical arrays, suggesting a practical compromise.

Conclusions:

Array motion and orientation significantly affect acoustic time reversal focusing.
Tilted arrays present a versatile solution for mobile TRA applications in sonar and communication.
Understanding these effects is crucial for optimizing underwater acoustic systems.