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Estimating ship source levels using distributed acoustic sensing data and validation with hydrophone measurements
1School of Oceanography, University of Washington, Seattle, Washington 98195, USA.
JASA Express Letters
|August 7, 2026
Summary
This study quantifies the relationship between distributed acoustic sensing (DAS) and hydrophone measurements of ship noise. A conversion factor was derived, highlighting variability and the need for further DAS calibration research.
Area of Science:
- Ocean acoustics
- Geophysical sensing technologies
Background:
- Ship noise impacts marine ecosystems and acoustic monitoring.
- Distributed Acoustic Sensing (DAS) offers a novel method for underwater acoustic measurements.
Purpose of the Study:
- To quantify the relationship between DAS strain and hydrophone pressure for ship noise.
- To derive a conversion factor for DAS measurements of underwater acoustics.
Main Methods:
- Analysis of simultaneous recordings from a DAS array and a hydrophone during a cargo ship transit.
- Calculation of a conversion factor within the 30-50 Hz frequency band.
Main Results:
- A conversion factor of 177.7 ± 3.5 dB was derived, linking DAS strain to hydrophone pressure.
- Significant variability was observed when comparing this factor to existing studies.
Conclusions:
- The derived conversion factor provides a quantitative link between DAS and hydrophone measurements.
- Variability in reported factors emphasizes the need for standardized DAS calibration and further research.
