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Higher-order figure-8 microphones/hydrophones collocated as a perpendicular triad-Their "spatial-matched-filter" beam
Shiyu Sandy Du1, Kainam Thomas Wong1, Yang Song2
1School of General Engineering, Beihang University, Beijing, 100191, China.
The Journal of the Acoustical Society of America
|March 2, 2022
Summary
This study analyzes how sensor directivity order impacts acoustic vector sensor beam steering. Higher directivity orders can limit directional maneuverability, affecting signal processing capabilities.
Area of Science:
- Acoustics
- Signal Processing
- Sensor Technology
Background:
- Directional sensors enable signal processing for azimuth-polar direction uncoupling.
- Acoustic vector sensors, comprising three perpendicularly oriented figure-8 sensors, offer spatial compactness.
Purpose of the Study:
- To investigate the effect of increasing sensor directivity order on acoustic vector sensor beam steering.
- To determine which directivity orders allow full azimuthal maneuverability.
Main Methods:
- Analytical investigation of higher-order directivity in figure-8 sensors.
- Rigorous analysis of the spatial-matched-filter beam's directional steering capability.
Main Results:
- Increasing the directivity order of figure-8 sensors does not necessarily sharpen the overall triad's directionality.
- Specific directivity orders were identified as enabling full azimuthal beam maneuverability, while others restrict it.
Conclusions:
- The directivity order of individual sensors critically influences the acoustic vector sensor's beam steering capabilities.
- Understanding these effects is crucial for optimizing directional sensing and signal processing.
