Marine noise measurement encompasses airborne noise emitted by vessels, underwater radiated noise, port and harbour environmental noise monitoring, and offshore platform ambient noise characterisation. PLACID measurement microphones are used in ship noise certification surveys to ISO 2922, in port environmental monitoring programmes, and in research into underwater radiated noise and its effects on marine ecosystems.
Airborne noise measurement on vessels and at port boundaries follows the same fundamental methodology as land-based environmental noise monitoring, but with additional challenges: the sensor must be resistant to salt spray, high humidity, and corrosion; the vessel presents a moving source; and background noise from water and other vessel traffic can be significant. PLACID outdoor-rated measurement microphone systems are appropriate for these conditions.
Underwater radiated noise (URN) from commercial shipping is increasingly regulated under IMO MEPC guidelines as evidence grows of its impact on marine mammals and fish. URN measurement uses hydrophones rather than conventional measurement microphones. PLACID can advise on appropriate sensor selection and DAQ configuration for both airborne vessel noise measurement and underwater monitoring programmes. Contact our technical team for application-specific guidance.
Port environmental noise monitoring programmes operating under the EU Environmental Noise Directive require Strategic Noise Mapping and Action Plans. Monitoring stations at port boundaries must demonstrate that the measurement system meets IEC 61672-1 Class 1 requirements and that calibration is maintained and documented throughout the monitoring programme. PLACID provides complete outdoor monitoring packages with accredited calibration suitable for port boundary monitoring under EU Directive 2002/49/EC.